SPECICATION NO. ETI/PSI/144 (12/91) SPECIFICATION FOR ... - rdso
SPECICATION NO. ETI/PSI/144 (12/91) SPECIFICATION FOR ... - rdso
SPECICATION NO. ETI/PSI/144 (12/91) SPECIFICATION FOR ... - rdso
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<strong>SPECIFICATION</strong><br />
<strong>FOR</strong><br />
<strong>SPECICATION</strong> <strong>NO</strong>. <strong>ETI</strong>/<strong>PSI</strong>/<strong>144</strong> (<strong>12</strong>/<strong>91</strong>)<br />
SUPERVISORY CONTROL AND DATA ACQUITION (SCADA)<br />
SYSTEM <strong>FOR</strong> 2x25 kV A.T TRACTION<br />
POWER SUPPLY<br />
TRACTION INSTALLATION DIRECTORATE<br />
RESEARCH DESIGNS AND STANDARDS ORGANISATION<br />
MINISTRY OF RAILWAYS<br />
GOVERNMENT OF INDIA<br />
MANAK NAGAR, LUCK<strong>NO</strong>W – 226011<br />
INDIA
Specification No. : <strong>ETI</strong>/<strong>PSI</strong>/<strong>144</strong> (<strong>12</strong>/<strong>91</strong>)<br />
SUPERVISORY CONTROL AND DATA ACQUISITION (SCADA) SYSTEM <strong>FOR</strong><br />
2x25 kV A.T. TRACTION POWER SUPPLY<br />
1.0 Scope<br />
1.1 This specification applies to the design, manufacture, supply, erection,<br />
testing and commissioning of SCADA system to enable the Traction Power<br />
Controller(TPC) or operator, to control from a central place called Remote Control Centre<br />
(RCC), the switching operations of the equipments at traction sub-stations and switching<br />
stations (hereinafter called "controlled stations"), to monitor the status of the equipments<br />
and to collect and store information and data relating to the overall traction power supply<br />
to the 2X25 kV overhead traction lines.<br />
1.2 The SCADA equipment shall be based on the state-of-the-art technology.<br />
The equipment at RCC, here after called as master station equipment, shall include dual<br />
main mini-computer(s) system with sufficient semi-conductor RAM main memory, high<br />
speed computer to computer communication link, system consoles, man-machine<br />
interfaces through color VDUs and key-boards, front-end processors, modems, data<br />
logging printers, watch dogs, floppy disks and hard disks along with their drives, switchover<br />
unit for switching over from main to standby computer or vice-versa, mimic driver<br />
and mimic diagram board (MDB), UPSs with battery, console desks and surge arresters.<br />
1.2.1 As an alternative to the master station built around minicomputers, tenderer<br />
shall also quote for a master station built around dual main micro-computers.<br />
1.3 The SCADA equipment at controlled station, hereafter called as Remote<br />
Terminal Unit (RTU), shall be micro-processor based and shall be compatib1e with the<br />
master station equipment• It shall be complete in all respects including central processing<br />
unit with watch dog, digital input/output modules, alarm input modules, analogue input<br />
modules, transducers, memory, interposing relays, summation current transformers, power<br />
supply units, surge arresters and modem.<br />
1.4 The SCADA equipment at RCC and at controlled stations shall be complete<br />
with all units, parts and accessories necessary for their efficient operation and all such<br />
units, parts and accessories shall be deemed to be within the scope of this specification<br />
whether specifically mentioned or not.<br />
2.0 Service conditions<br />
2.1 The SCADA equipment may be installed any where in India. The<br />
equipment at RCC shall be installed indoors. Air-conditioning may be provided, if<br />
convenient, or else filtered air will be blown through to cool the equipments.<br />
2.2 The SCADA equipment at controlled stations shall be installed inside track<br />
side cubicles and subjected to vibrations on account of running trains on the near-by<br />
railway tracks. These cubicles will not be air-conditioned and are liable to exposure to<br />
polluted atmosphere.
2.3 Atmospheric Conditions<br />
Maximum average ambient temperature<br />
Minimum ambient temperature<br />
Relative humidity<br />
… 45 deg C<br />
… 0 deg C<br />
... 100 %<br />
The locations at which the equipment is to function shall be subjected to dust<br />
storms in summer, and to heavy rains and lightning during monsoon.<br />
2.4 The SCADA system is intended for use at altitude not exceeding 1000 metres.<br />
2.5 Voltage and frequency<br />
2.5.1 At RCC : 415 V, 3 phase 50 Hz supply from the State Electricity Board shall<br />
be made available by the Railways. The voltage may vary between +10% and -15%, while<br />
the frequency between +3% and -3% of the nominal values. The master station equipment<br />
shall be suitable for satisfactory operation throughout these variations.<br />
2.5.2.1 240V, single phase 50 Hz a.c.supply from the auxiliary transformers provided<br />
at controlled stations shall be made available by the Railways. Due to variation in the<br />
catenary voltage(25kV). The single phase voltage may vary between 180 V and 265 V.<br />
The frequency may vary between +3% and -3% of the nominal value. The RTU equipment<br />
shall normally operate off this a.c. supply and be suitable for satisfactory operation<br />
throughout variations in voltage and frequency.<br />
2.5.2.2 Operation (open/close) of circuit breakers, interruptors and other<br />
equipments is carried out at 110 V d.c. For this purpose necessary battery charger shall<br />
be provided by the railways.<br />
2.5.2.3 In case of failure of a.c. supply at the controlled station, the RTU shall<br />
automatically operate off the 110 V d.c. supply. The d.c. voltage may vary between +l0%<br />
and -15% of the nominal value. The RTU shall be suitable for satisfactory operation<br />
throughout this variation.<br />
3.0 Governing specifications<br />
3.1 The SCADA equipment and component thereof shall, unless otherwise<br />
specified, conform generally to the latest editions of the Bureau of Indian Standards<br />
specification mentioned below:<br />
IS:590 Fixed paper dielectric capacitors.<br />
IS:1554 PVC (Heavy duty) insulated electric cables.<br />
IS:1652 Stationary cells and batteries, lead-acid type with plants positive plates.<br />
IS:1765 Direct current Potentiometers.
IS:3700 Ratings and characteristics of semiconductors devices.<br />
IS:3895 Monocrystalline semi-conductor rectifier cells and stacks.<br />
IS:4007 Terminals for electronic equipment.<br />
IS:5051 Relays for electronic and telecommunication equipment.<br />
IS:5786 Fixed carbon resistors, general purpose, low power.<br />
IS:8309 Compression type tubular terminal ends for Aluminium conductors of<br />
insulated cables.<br />
IS:9521 Metal clad base material for printed circuits for use in electronic and<br />
telecommunication equipment.<br />
IS:9638 Fixed polyester film dielectric capacitors for direct current.<br />
IS:98<strong>91</strong> Edge connectors for printed wiring board.<br />
IS:10482 Connectors for printed wiring board.<br />
3.2 The above specifications shall be applied in a manner altered amended or<br />
supplemented by this specification and the latest Indian Electricity Rules wherever<br />
applicable.<br />
3.3 Any deviation from this specification proposed by the tendered,<br />
calculated to improve upon the performance, utility and efficiency of the equipment, will<br />
be given due consideration, provided full particulars of the deviation with justification<br />
thereof are furnished. In such a case, the tendered shall quote according to this<br />
specification and deviations, if, any, proposed by him shall be quoted as an alternative(s).<br />
4.0 Description of the 2x25 kV A.T. system<br />
4.1 The power for electric traction is supplied in a.c. 50 Hz, single phase<br />
through 2x25kV A.T. feeding system, which has a feeding voltage (2x25kV) from the<br />
traction sub-station (TSS) two times as high as the catenary voltage (25kV). This high<br />
voltage power supplied from the sub-station through catenary wire and feeder wire in<br />
stepped down to the catenary voltage by use of auto-transformer (ATs) installed about<br />
every 13 to 17 km along the track at auto transformer Post (ATP), Sub-sectioning, and<br />
Paralleling Post (SSP) and Sectioning, and Paralleling Post (SP) and then fed to the<br />
locomotives. In other words, both the catenary voltage and the feeder voltage are 25kV<br />
against the rail, although the sub-station feeding voltage between catenary and feeder<br />
wires is 50kV. Therefore, the catenary voltage is the same as that of the conventional<br />
25kV system.<br />
Since the power is supplied in two times higher voltage, the 2x25kV AT<br />
system is suitable for a large power supply and it has the following advantages as<br />
compared with the conventional 25kV system.<br />
(a) Less voltage drop in feeder circuit.<br />
(b) Large spacing of traction substations.<br />
(c) Less telecommunication interferences.<br />
(d) Suitable for high speed operation.<br />
The power is obtained from 220 or 132/2x25kV Scott-connected/single<br />
phase transformer provided at the sub-station, which are normally spaced between 70 to<br />
100km apart. The primary windings of the transformers are connected to two or three<br />
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phases of the 220 or 132kV, three phase, effectively earthed transmission net work of the<br />
State Electricity Board, in case of a single phase transformer or in case of two single<br />
phase V-connected transformers/Scott connected transformer respectively. The Scottconnected<br />
transformer and V-connected single phase transformers are effective in<br />
reducing the voltage imbalance caused by the traction loads on the transmission net-work<br />
of the Electricity Board.<br />
One outer wide terminal of the secondary windings of traction transformer is<br />
connected to the catenary, the other outer side terminal being connected to the feeder.<br />
Two inner side terminals are, via series capacitors or directly, connected to each other,<br />
and their joint is solidly earthed and connected to the running rails.<br />
The load current from the sub-station flows through the catenary and returns to the<br />
sub-station through the feeder. Between two adjacent ATs, the load current fed from the<br />
catenary to the locomotive flows in the rail and is boosted up to the feeder through the<br />
neutral tape of the two ATs.<br />
Mid-way between two sub-stations, a SP is introduced. At the point of<br />
TSS and SP, a dead zone known as neutral section is provided in the OHE to avoid wrong<br />
phase coupling. The power to the catenary and feeder on each side of the TSS is fed by<br />
one feeder circuit breakers, even if there exist two breakers for one side. The two<br />
breakers are used as a stand-by for each other. For maintenance work and keeping the<br />
voltage drop within limits, one or more SSPs are introduced between the TSS and SP. On<br />
a double track section, a SSP normally has four sectioning interruptors and one<br />
paralleling interruptor, and a SP has two paralleling interruptors and two bridging circuit<br />
breakers. In case of fault on the OHE, the corresponding feeder circuit breaker of the substation<br />
trips and isolates it.<br />
A figure showing the principles of AT feeding system and a typical power<br />
supply diagram showing this general feeding arrangement at a traction sub-station and<br />
sections of the OHE are given in the sketch at Appendix-I.<br />
4.2.1 Protection System at traction sub-station:<br />
transformers:<br />
Following relays are provided for the protection of traction sub-station<br />
(a) Differentials relay.<br />
(b) Over current relay on receiving side.<br />
(c) Earth fault relay on receiving side.<br />
(d) Instantaneous over-current relay on receiving side.<br />
(e) Phase failure relay (to detect malfunction of feeder circuit breaker).<br />
(f) Auxiliary relays for transformer faults i.e. Buchholz, excessive winding<br />
and oil temperature strip and alarm, pressure relief device trip and alarm<br />
and low oil level alarm.<br />
(g) Over-current relay on 2x25 kV side as back-up to feeder protective relays.<br />
4.2.2. Following relays are provided for the protection of OHE:<br />
(a) Distance relay (with a parallelogram protection characteristics)<br />
- 5 -
(b) Delta-I type fault selective relay.<br />
(c) Instantaneous over-current relay<br />
(d) Under-voltage relay to avoid wrong phase coupling<br />
4.3 Auto reclosing of feeder circuit breaker:<br />
A single shot auto-reclosing scheme for the feeder circuit breaker at<br />
traction sub-station has been adopted to facilitate reclosing of the breaker automatically<br />
once, after a pre-set time delay after tripping of the breaker on OHE fault. This feature<br />
will help in quick restoration of traction power supply to OHE if the fault is of a transient<br />
nature.<br />
4.4 All traction substations and switching stations are normally unattended and<br />
off circuit tap changer of the transformer, circuit breakers, interruptors, and motor<br />
operated remotely from the RCC through the SCADA equipment.<br />
4.5 The off circuit tapchanger of the transformer, circuit breakers, interruptors<br />
and motor operated isolators could also be operated locally as well as manually at the<br />
TSS, SP and SSP as the case may be. At the TSS, a local/remote changeover switch is<br />
provided on the control panel, as well as in the mechanism box of the circuit breaker,<br />
interruptor and motor operated isolator. No control panel exists for the interruptors<br />
/circuit breakers at the SP and SSP and therefore the local/remote changeover switch is<br />
provided on the mechanism box of the interruptor/circuit breaker.<br />
5.0 General Information<br />
5.1 Remote Control Centre<br />
5.1.1 The building, provided by the Railways for housing the RCC, shall include<br />
the main control room, equipment room, UPS room,RC laboratory and battery room. The<br />
layout of the RCC and the equipments therein will be decided by the `Railways‘.<br />
5.1.2. The RCC will be suitably illuminated, and the equipment room, control<br />
room and RC laboratory may be air-conditioned, if convenient, or else filtered air will be<br />
blown through to cool the equipments, by the Railways. The SCADA equipment shall be<br />
designed to give satisfactory Service without air-conditioned.<br />
5.1.3. Necessary cable trenches will be provided by the Railways.<br />
5.1.4. The computer furniture for operator workstation shall be supplied by the<br />
successful tenderer. It shall include:<br />
(i) One table and one chair for each workstation.<br />
(ii) Two tables, one for each data logger, and<br />
(iii) One table and one chair for the Engineer‘s workstation.<br />
The furniture shall be procured from M/s Godrej or other reputed manufacturer as<br />
per the basic design enclosed a Appendix 2 to this specification.<br />
5.2 Control room building at controlled station:<br />
5.2.1. A control room building will be provided by the Railways at each TSS,<br />
having an equipment room and also a battery room. This equipment room will house the<br />
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main control and relay panel, 240V a.c. and 110V d.c. distribution board, 110V battery<br />
chargers, telephone apparatus as well as RTU(S). The battery room will house the 110V<br />
and telephone batteries. A Typical layout of the control room building is indicated in Drg.<br />
No.<strong>ETI</strong>/<strong>PSI</strong>/0238. Mod.B at Appendix.3.<br />
5.2.2 A small masonary building will be provided by the Railways at each SP,<br />
SSP and ATP, having an equipment room and a battery room. The equipment room will<br />
house RTU, battery charger, terminal board, 240V a.c. distribution board and telephone<br />
apparatus. The battery room will house 110V and telephone batteries. A typical layout is<br />
indicated in Drg. No.<strong>ETI</strong>/<strong>PSI</strong>/0010, Mod.D Appendix 4.<br />
5.2.3 The buildings at controlled stations are not air- conditioned. Suitable<br />
illumination inside the rooms shall be provided by the Railways.<br />
5.3 Operation of circuit breakers, interruptors and motor operated isolators at<br />
controlled stations<br />
5.3.1 The closing and tripping circuits of the circuit breakers, interruptors and<br />
motor-operated isolators are designed to operate off 110V battery supply, the batteries<br />
being provided by the Railways.<br />
5.3.2 Interposing contractors, for operating the closing and tripping circuits from<br />
RCC shall form part of the SCADA equipment. The contractor shall be suitable for 110V<br />
d.c. supply varying from +10% to -15%. The contacts of contractors shall have a<br />
continuous current carrying capacity of 10A, making capacity of 20A and breaking<br />
capacity of 2A inductive load. The contacts are liable to damage due to breaking of<br />
inductive current in the trip/closing coil circuits and therefore an arrangement for spark<br />
quenching, if necessary, shall be provided. Besides, the interposing contractors shall be<br />
so designed that it remains energised for a period adjustable between 500ms and 2s,<br />
arrangement for which shall be provided on the control output card in the RTU. These<br />
measures are required to prevent damage to the contacts.<br />
5.4 Monitoring of the state of catenary<br />
Outdoor type 27.5kV/110V, 100VA potential transformers are installed at<br />
the controlled stations by the Railways for monitoring the state of sub-sectors of the<br />
catenary i.c. Whether energized or not and for under-voltage relay operation at the SPs.<br />
The catenary voltage sensing shall be done through rectifier and solid-state comparator<br />
circuits so designed that the de-energised indication on the MDB/VDU appears at a<br />
voltage selectable between 50% and 70% and disappears between 60% and 80% of the<br />
rated voltage viz 110V a.c.<br />
5.5 Telesignals and their monitoring<br />
5.5.1 The various telesignale from typical TSS, SSP, SP and ATP in a double line<br />
section to the master station are as under:<br />
I. From each TSS<br />
(a) Name of telesignal<br />
1. 110V d.c. low.<br />
2. 240V a.c. fail.<br />
3. Catenary-1 fail/feeder-1 P.T. fuse fail.*<br />
4. Catenary-2 fail/feeder-1 P.T. fuse fail.*<br />
5. Catenary-3 fail/feeder-2 P.T. fuse fail.*<br />
6. Catenary-4 fail/feeder-2 P.T. fuse fail.*<br />
- 7 -
7. 220/132/110/66kV transmission line circuit-1 P.T. fuse fail<br />
(wherever required).<br />
8. 220/132/110/66kV transmission line circuit-2 P.T. fuse fail<br />
(wherever required).<br />
* There is no separate telesignal for PT fuse fail indication. The<br />
annunciation for PT fuse fail indication shall be done in case of any inconsistency<br />
between the status of feeder circuit breaker/paralleling interruptor and the catenary<br />
indications. (Feeder circuit breaker/paralleling interruptor when under power block is to<br />
be treated as ‗open‘ for this purpose.)<br />
(b) For each Scott-connected/single phase Traction Power Transformer, Auto<br />
transformer and associated switchgear<br />
(i) From transformer-1<br />
*9. TR-1 Alarm.<br />
**10. TR-1 Fault<br />
***11. TR-1 Trip circuit 110V dc fail<br />
<strong>12</strong>. TR-1 220/132/110/60 LV circuit breaker ―Locked –out‖ due<br />
to low gas/air pressure.<br />
13 TR-1 25kv CD-1 ―Locked out‖ due to low gas/air pressure<br />
14-19 TR-1 tap 1 to 6 position<br />
20 TR-1 Blower fans working<br />
21 TR-1 25kV CB-2 ―Locked-out‖ due to low gas/air pressure<br />
(In case of Scott-connected transformer only).<br />
* TR-1 Alarm: This has to come whenever any alarm viz. Buchholz Alarm,<br />
pressure relief device alarm, oil/winding temperature my high alarm and low oil level<br />
alarm occurs.<br />
** TR-1 fault: This has to come whenever the inter-trip relay (which trips both<br />
HV and LV breakers of the transformer) operates.<br />
*** TR-1 trip-circuit fail: Whenever the 110V dc supply to the control circuits<br />
fails or any of the trip circuits of 220/132/110/66kV or 25kV transformer circuit breakers<br />
fails.<br />
Necessary auxiliary contacts of various relays/indicators suitably wired up<br />
and terminated on the control and relay board at traction sub-station shall be provided by<br />
the Railways. Suitable relays or circuits required in the RTU at TSS for the telesignal<br />
shall be provided by the successful tenderer.<br />
(ii) From Transformer-2<br />
22 to 34-as for TR-1<br />
(iii) From Transformer-2(as required)<br />
35 to 47-as for TR-1<br />
(iv) From Auto Transformer-1<br />
*48. AT-1 Alarm<br />
**49. AT-1 Fault<br />
* AT-1 alarm: This has to come whenever any alarm viz. Suchholz<br />
alarm, pressure relief device alarm, oil/winding temperature high alarm and low<br />
oil level alarm occurs.<br />
** AT-1 fault: This has to come whenever any fault in the transformer is<br />
- 8 -
indicated by operation of Buchholz relay, pressure, relief device, winding<br />
temperature indicator and oil temperature indicator.<br />
Necessary auxiliary contacts of various relays/indicators suitably wired<br />
up and terminated on the control and relay board/terminal board shall be provided<br />
by the Railways. Suitable relays or circuits required in the RTU for the telesignal<br />
shall be provided by the successful tenderer.<br />
5 From AT-4<br />
(v) From AT-2<br />
(vi) From AT-3<br />
50-51-as for AT-1<br />
52-53-as for AT-1<br />
54-55-as for AT-1<br />
(c) Common telesignals for TR-1 to TR-3 and AT1 to AT4<br />
56. 110V dc supply for alarm circuits fail.<br />
(d) For each feeder circuit breaker<br />
(i) For feeder-1<br />
(ii) For feeder CB-2<br />
57. Feeder CB-1 DPR operated.<br />
58. Feeder CB-1 instantaneous OCR operated.<br />
59. Feeder CB-1 Delta-I relay operated.<br />
60. Feeder CB-1 ―Locked out‖ due to low gas/air pressure<br />
61. Auto-recloser for CB-1 ―Locked-out‖.<br />
62 to 66-as for feeder CB-1<br />
(iii) For feeder CB-3<br />
67 to 71-as for feeder CB-1<br />
(iv) For feeder CB-4<br />
72 to 76-as for feeder CB-1<br />
(c) For shunt capacitor bank control (as required)<br />
(i) Bank-1<br />
(ii) Bank-2<br />
77. CB ―Lockedout‖ due to low gas/air pressure.<br />
78. PT fuse fail<br />
79. Shunt capacitor bank fail<br />
80 to 82-as for bank-1<br />
* The shunt capacitor bank may be provided with a potential free 11/0 contact<br />
- 9 -
which closes in case of my internal fault(s) in the shunt capacitor bank.<br />
II. From each SP<br />
1. 110V dc low..<br />
2. 240V ac fail<br />
3. Catenary-1 fail<br />
4. Catenary-2 fail<br />
5. Catenary-3 fail<br />
6. Catebary-4 fail<br />
7. AT-1 Alarm<br />
8. AT-1 Fault<br />
9. AT-2 Alarm<br />
10. T-2 Fault<br />
11. At-3 Alarm<br />
<strong>12</strong>. AT-3 Fault<br />
13. AT-4 Alarm<br />
14. AT-4 Fault<br />
15. CB.1 ―Locked out‖ due to low gas/air pressure.<br />
16. CB.2 ―Locked out‖ due to low gas/air pressure.<br />
For details of AT-1 to 4 Alarms and At-1 to 4 Faults, explanation given in clause No.<br />
5.5.1.I.b (iv) may be seen.<br />
III. From each SSP<br />
1. 110V dc low<br />
2. 240V ac fail<br />
3. Catenary-1 fail (wherever required)<br />
4. Catenary-2 fail (wherever required)<br />
5. AT-1 Alarm<br />
6. AT-1 Fault<br />
7. AT-2 Alarm<br />
8. AT-2 Fault<br />
For details of AT-1 to 2 Alarms and At-1 to 2 Faults, explanation given in clause No.<br />
5.5.1.I.b (iv) may be soon.<br />
IV. From each ATP<br />
1. AT-1 Alarm<br />
2. AT-1 Fault<br />
3. AT-2 Alarm<br />
4. AT-2 Fault<br />
5. 240V ac fail<br />
6. 110V dc low<br />
For details of AT-1 to 2 Alarms and At-1 to 2 Faults, explanation given in clause No.<br />
5.5.1.I.b (iv) may be seen.<br />
5.5.2 The protective relays viz. OCR, DPR and delta-I relay reset themselves<br />
immediately after operation.<br />
- 10 -<br />
5.5.3 Amongst the above tele-signals, the monitoring of ―dc low‖<br />
Indications shall be through solid-state comparator circuits, while that of ―a.c. fail‖ and
- 11 -<br />
―PT fuse fail‖ indication through rectifier and no-volt relays, and that of ―catenary<br />
supply‖ indications through rectifier and solid-state comparator circuits. Monitoring of<br />
the balance indications shall be through 110V dc interposing relays. The rectifier,<br />
comparator circuits, no-volt relays and interposing relays shall form part of the RTUs.<br />
5.6 Tap-changer control of traction power transformers<br />
5.6.1 The traction power transformer at s TSS may be provided with motor operated<br />
off-circuit tap changer with 110V dc control circuit. For remote control of the tapchanger<br />
from the RCC, progression/regression telecommand shall be provided. The tap<br />
position shall be telesignalled to the RCC in confirmation of the telecommand.<br />
5.6.2 The tap changer switch has six tap positions. For each tap position one <strong>NO</strong><br />
type contact is provided. At any tap position, only the corresponding <strong>NO</strong> contact will<br />
remain closed and the remaining contacts will remain open.<br />
5.6.3 Each telecommand for the tap changer shall include progression/regression<br />
telecommand and the back telesignal from the TSS of the tap position.<br />
5.7 The terminal required for interfacing the controlled station with RTU at TSS<br />
shall be provided by the railways in the control and relay panel at TSS. The terminal at<br />
SP/SSP/ATP shall be provided on a terminal board mounted on the wall inside the<br />
masonry building at SP/SSP/ATP. The supply of cable and wiring between the control<br />
and relay panel/terminal board and RTU shall be done by the successful tendered. The<br />
cable shall conform to IS:1554.<br />
5.8 Underground trunk cable<br />
5.8.1 Underground telecommunication trunk cable is provided by the railway<br />
alongside the railway track. Three part of conductors (one pair for ―Send‖, one pair for<br />
―Receive‖ and third pair as spare) from this cable shall be made available for remote<br />
control purposes.<br />
5.8.2 The cable shall conform to railways specification No.TC-14/75. The salient<br />
technical particulars of the star quads Of the cable circuits made available for remote<br />
control operation are as under:<br />
(a) Dia of copper conductor 0.9mm<br />
(b) Type of insulation Paper<br />
(c) Nominal loop resistance at 55.2 ohms/km<br />
20 degree c.<br />
(d) Resistance unbalance between Not more than 1%<br />
Two conductors of a pair of nominal loop.<br />
(e) Nominal mutual capacitance of 0.041 microfarad/km.<br />
The pairs of paper insulated<br />
VF quads<br />
(f) Capacitance unbalance after<br />
Balancing of full loading<br />
section of 1.83km.<br />
(i) Between pairs (same quad) Less than 40pF
(ii) Between pairs (adjacent quads) Less than 40pF Quads)<br />
(g) Characteristic impedance of 1<strong>12</strong>0 ohms<br />
Paper insulated pairs at 300Hz<br />
when loaded<br />
(h) Insulation resistance when Not less than 10,000<br />
measured at 500V meg. Ohms/km<br />
(i) Loading at intervals of 33 milli Henries<br />
1.33km<br />
(j) Attenuation at 800Hz 0.25dB/km<br />
when loaded<br />
5.8.3 The characteristics of tapping, terminating and sectionalisting transformer<br />
for voice frequency circuits are as under:<br />
(a) Impedance ratio 1<strong>12</strong>0:1<strong>12</strong>0+2%<br />
(b) Insertion loss from 300Hz Less than 0.9 dB<br />
to 2500Hz<br />
(c) Bridging loss with secondary Less than 0.015dB<br />
open from 300Hz to 2500Hz<br />
(d) Attenuation distortion from Less than +0.1dB<br />
300Hz to 2500Hz<br />
(e) Dielectric strength 2000V ac (rms) for<br />
1 Minute<br />
(f) Return loss in frequency More than 20 dB<br />
range of 300 Hz to 2500 Hz<br />
5.8.4 Isolating transformers will be installed at every 10 to 20 kms by the railways<br />
to limit the induced voltage.<br />
- <strong>12</strong> -<br />
5.8.5. Voice frequency repeaters will be provided by the Railways at intervals of<br />
40 to 50 km to boost the signal level. The amplifier gain at the repeater station will be<br />
about 20dB with an equaliser incorporated to compensate up to 0.02dB/kc/km. The<br />
SCADA equipment shall, however, incorporate an amplifier having a minimum gain of<br />
30 dB to compensate for any signal level variation at difficult points in the system.<br />
5.8.6. The repeater section far and cross talk attenuation (equal level cross talk)<br />
between any two voice frequency pairs at a frequency of 800Hz will be not less than<br />
65dB and that at the near-end not less than 61dB.<br />
5.8.7. The underground trunk cable being normally laid close to the railway track,<br />
the lead from tapping transformers to the remote control or control building would be<br />
small.
- 13 -<br />
5.8.8. The Railways will tap the main underground cable and terminate three pairs<br />
(including one spare pair) of conductors on a terminal board at the RCC and at each<br />
controlled station. At the point of tapping from the main underground trunk cable,<br />
isolating transformer with impedance ratio of 1<strong>12</strong>0/1<strong>12</strong>0 ohms will be provided by the<br />
Railways. Any other matching transformers considered necessary for satisfactory<br />
operation of the SCADA equipment shall be provided by the successful tenderer.<br />
5.8.9. Surge arrestor assemblies for protection of remote control equipment against<br />
induced voltage in the telecommunication cable shall be provided on all the 3 pairs of<br />
conductors at RCC as wail as at all the controlled stations by the successful tenderer.<br />
5.8.10 The tendcrer shall carefully study and understand the specifications of the<br />
to1ecommunication cable and associated equipments given above end confirm that the<br />
SCADA equipment offered shall work satisfactorily. Any additional equipment/<br />
accessories in the cable circuits required to ensure satisfactory working shall be provided<br />
by the successful tendered.<br />
5.9 Microwave communication<br />
In. some of the sections on Indian railways dedicated Micro wave channel at<br />
carrier frequency of 18 Ghz has been provided for the purpose of communication.<br />
5.10 Optical fibre cable<br />
Optical fiber cab1e is now being introduced for communication in acc of the<br />
sections on Indian Railways. The interface between the optical fiber cable and the RTUs<br />
to be supplied by the manufacturer shall b3 provided by the railways, The salient<br />
technical particulars of optical fiber cable and optical line terminating equipment are as<br />
under:<br />
(I.) Optical fibre cable<br />
a) The cable consists of six/eight mode fibres.<br />
b) Mono mode fibre: As poor CCIET recommendation<br />
No.G652.<br />
c) Optimised wave length 1300nm +/— 0.25nm.<br />
band<br />
d) Nominal mode-field 0 to 10 micrometer +/—10%.<br />
Diameter<br />
e) Nominal cladding diameter <strong>12</strong>5 microns +/— 2.4%.
f) Cut—off wave length 1<strong>12</strong>0 to <strong>12</strong>80 nm<br />
g) Attenuation Less than 0.5 dB/m at<br />
1300mm band measured at<br />
the worst wave length.<br />
h) Total dispersion Less han7.0ps/nm/Icn<br />
(Fibre 0ptimised for 1300nm<br />
band)<br />
i) Splicing loss including Less than 0.15 dB/joint.<br />
splicing protection.<br />
(II) Optical Line terminating equipment<br />
(i) Electrical interfaces:—<br />
a) Line bit rate 2048 kB/s.<br />
b) Line code : HDB-3<br />
c) Line Impedance 75ohms unbalanced or <strong>12</strong>0 ohm balanced<br />
CCITT. Rec. G703<br />
(ii) Optical interfaces: LED for transmission & SI-APD reception<br />
a) Line Bit Rate 2048 kB/s<br />
b) Line code CMI (Coded mark Inversion)<br />
c) Modulation Im (Intensity modulation)<br />
6.0 GENERAL DESIGN FEATURE OF THE SCADA SYSTEM<br />
6.1 Master Station Equipment<br />
6.1.1 Hardware configuration<br />
- 14 -<br />
(i) There shall be dual main mini-computer(s) system, one main and<br />
the other as hot standby, each system interfacing with its front and processor (s) and<br />
modem (s) for communication with the RTU‘s and with the man machine interface<br />
equipment to provide upto-date network data and to accept commands. Each system shall<br />
have its own system console and hard and floppy disks along with their drives, and watch<br />
dogs for monitoring the healthiness of the system.
- 15 -<br />
(ii) There shall be two data-logging printers one on-line and the other as<br />
standby. Both the printers shall be connected to the same on-line computer system. In<br />
case of one printer, the other printer shall automatically take over.<br />
(iii) In case of failure of one computer system, the switchover to the other<br />
computer system shall be through an automatic switchover system. However, provision<br />
for manual changeover between the computers shall be provided by the manufacturer.<br />
6.1.2 Man Machine Interface<br />
6.1.2.1 Workstations<br />
6.1.2.1.1 There shall be two work-stations, one for each of two operators, each<br />
consisting of two semigraphic colour VDU‘s and their keyboards. The keyboard shall<br />
contain both functional keys for operations that are repeated frequently, and alphanumeric<br />
keys for inputting numerical data and text. The key-board shall be interactive<br />
with the displays on the VDUs, which allows parameter changes and device control by<br />
identification of the object to be addressed by device or position reference input or via the<br />
function and alphanumeric keys, or by the positioning of a cursor. The interaction<br />
between the operator and the computer to select displays, to between the operator and the<br />
computer system to select displays, to give commands, and to input data for limits,<br />
calculation parameters and other items shall be of a simple dialogue nature. Text, for<br />
tagging or recording or sanctions. May be temporarily added to the displays when entered<br />
via the keyboard.<br />
6.1.2.1.2 Both the workstation shall be connected to the same online computer and<br />
shall meet the following requirements:<br />
(i) Each workstation shall normally control pre-defined, physically demarcated<br />
sections.<br />
(ii) In case of complete outage of one workstation, all its functions shall be<br />
transferred to the healthy workstation so that normal operations continue.<br />
(iii) Normally one VDU will be online and the other VDU as standby at each of<br />
the workstations. However, if desired by the operator, it shall be possible to have online<br />
both the VDUs for viewing station diagram for tele control purpose and the other VDU<br />
for viewing alarms, on-demand trend curves, histograms and other data.<br />
Note:- Two workstations as mentioned above are for controlling upto 30<br />
RTUs. However, if the number of RTU‘s in the system are less than or equal to 15 then<br />
only one workstation shall be provided. On the other hand, if the number of RTUs in the<br />
system are more than 30, then for each 15(or less) additional RTUs one more workstation<br />
shall be provided.
- 16 -<br />
6.1.2.2.4 Modes of operation<br />
The modes of operation shall include the supervisory mode, control mode,<br />
edit mode and programming mode.<br />
6.1.2.1.4. Security<br />
To ensure a high degree of system security and to prevent unauthorized<br />
operations, the following levels of access shall be provide.<br />
(i) Operator‘s level<br />
This level is for interaction of the TPC with the computer for his<br />
day-to –day working.<br />
(ii) Supervisory level<br />
This level is meant only for getting information from the computer.<br />
Control operation of electric switchgear shall not be this level.<br />
(iii) Programmer‘s level<br />
This level is for compilation purposes only.<br />
(iv) Engineer‘s levels<br />
This level shall have total access to all the programmers stored in<br />
the system and shall normally be retained by the manufacturer till specifically asked for<br />
the railways.<br />
6.1.2.1.5 The operators‘ console desk and separate stand(s) for VDUs (if any) shall<br />
form part of the SCADA equipment.<br />
6.1.2.2 VDUs<br />
The size of VDUs at the operator‘s work-stations shall be a minimum of<br />
48cm (19‖) diagonally. It shall support 8 foreground and 8 background colours, have<br />
high resolution and provide a 80 columns X32 rows display. The character set shall<br />
include full standard ASCII characters and user-generated symbols, so as to generate<br />
tabular displays and semi-graphic displays of the traction power supply system.<br />
6.1.2.3 Engineer’s workstation<br />
A separate plug-in Engineers‘ workstation shall be provided incorporating a<br />
QWERTY key Board including special function keys and special characters and cursor<br />
control keys. Engineers‘ workstation shall include a 35 cm (14‘,) 80 columns x 32 rows<br />
monochrome VDU with a console capable of housing all equipments. The console shall<br />
be so designed that its installation in the equipment room is conveniently possible<br />
through plugs and sockets. Unauthorised use of key boards shall be prevented by use of a<br />
key lock switch and by entry of a security code.
6.1.3. Mimic diagram board (MDB)<br />
- 17 -<br />
6.1.3.1 A mimic diagram board and its associated mimic driver shall be provided<br />
at the RCC. The MDB shall depict the traction power supply diagram, indicating the<br />
energised/ de-energised condition of sub-sectors of catenary, status of interruptors and<br />
feeder circuit breakers at TSS & FP, SSP and SP.<br />
6.1.3.2 Since all control operations are to be carried out from the key board (s)<br />
provided at the workstation (s), the MDB‘s sole purpose is to give an overall view of the<br />
traction power supply system to the operator. In view of this limited function, the overall<br />
size of the MDB shall be restricted to 3500mm x 750mm x 200mm for depicting 30<br />
controlled stations.<br />
6.1.3.3 Annunciation for controlled stations<br />
For each controlled station an annunciation ―Remote station defective‖<br />
shall be provided on the MDB using an LED.<br />
6.1.3.4 Annunciations for master station equipment<br />
The following annunciations by LEDs shall be provided the MDB:<br />
i) Main system ON<br />
ii) Stand by system ON<br />
iii) Main system defective<br />
iv) Stand by system defective<br />
v) Main UPS sail<br />
vi) Stand by UPS fail<br />
vii) UPS battery low: This shall show up when the UPS<br />
battery voltage falls below 90% of the nominal voltage.<br />
Necessary relays/circuits for this purpose shall form part<br />
of the contract.<br />
viii) 415 V 3-phase ac to UPS fail<br />
6.1.3.5 Other facilities on the MDB<br />
The following facilities shall be provided on the MDB:
- 18 -<br />
i) Alarm indication pilot LED: A yellow alarm indication LED of<br />
10mm diameter shall be provided for each remote station. The LED shall light up when<br />
any alarm is received from the RTU.<br />
ii) A LEDs test push button(s) shall be provided to test the healthiness<br />
of LEDs on the MDB. Alternatively, the tender may carry out this function by software<br />
programme to be initiated from the workstation.<br />
6.1.3.6. No standby is required for the mimic drivers. Now ever, the arrangement<br />
shall be such that failure of any module shall not affect more than one RTU display on<br />
the MDB. However, there is no necessity to provide individual CPU for each controlled<br />
station on the MDB. The renderer may offer a system in which one CPU designated as<br />
―main‖ controls a maximum of ten stations along with its ―stand by ― CPU which shall<br />
take over functions automatically in the event of failure of main CPU.<br />
6.1.4 General requirements of Software<br />
6.1.4.1 The operating system used shall be suitable for multi-user, multi-tasking,<br />
networking and real time applications.<br />
6.1.4.2 The software shall include compilers for high level languages viz.<br />
<strong>FOR</strong>TRAN, BASIC and COBOL.<br />
6.1.4.3 The software shall support local area network facility.<br />
6.1.4.4 SCADA software<br />
6.1.4.4.1 The system shall be modular in structure and user friendly.<br />
6.1.4.4.2 VDU displays<br />
The software shall support the following VDU displays.<br />
(i) Station diagrams:<br />
(a) Semigraphic, coloured displays of any three adjacent controlled<br />
stations shall be provided. The display shall include both fixed and variable data, namely<br />
ON/OFF status of equipments, catenaries, alarms, measurands and names of the<br />
controlled stations.<br />
(b) Symbols: The symbols for various equipments shall be as per<br />
international standard.<br />
(c) The display shall permit transmission of telecommands to circuit<br />
breakers, interruptors and other equipments, by simple key-board operations by the<br />
operator. Facility for marking (manual input) shall be provided for any alarms,
equipments status including manually operated isolators, measurands and limit-settings,<br />
by simple key-board operations by the operator.<br />
(ii) Tabular displays: Tabular display of data of a controlled station<br />
shall be provided. The data shall include equipment status, alarms and measurands.<br />
- 19 -<br />
(iii) Alarm list: Display of the alarm list in a chronological order<br />
starting from any given time shall be provided. It shall include both current and historical<br />
alarm list. The current alarm list shall have 400 entries.<br />
(iv) Event list: Display of the event list, which includes commanded<br />
and uncommanded changes in equipment status, starting from any given time shall be<br />
provided. It shall include both current and historical event list. The current event list shall<br />
have 400 entries.<br />
(v) System clarms: The alarms generated by the SCADA equipment,<br />
and not by the traction power supply system, shall be displayed here.<br />
(vi) Trend diagrams: The time version value plot of upto four<br />
measurands shall be displayed in a trend diagram. Each measurand shall be displayed in a<br />
separate colour. The trending shall include both historical trending and dynamic trending<br />
of the current data.<br />
(viii) Histograms: For both current and historical data the time versus<br />
value plot of any measurand by histogram shall be provided.<br />
(viiii) Bargraphs: Display of the current values of upto four measurands<br />
by bargraphs-each bar having a different colour-shall be provided.<br />
(ix) Message pad: One page shall be provided for the operator to record<br />
important messages.<br />
Calling any of the VDU displays shall be by simple keyboard<br />
operations by the operator. NEXT/PREVIOUS or PAGE UP/DOWN option shall be<br />
made available.<br />
6.1.4.4.3 Update, process and alarm inhibit, equipment and RTU block/deblock and<br />
portability and upgradability feature<br />
(i) The software for the SCADA equipment shall be designed to cater<br />
for updating for adding or deleting controlled stations or individual parameters such as<br />
telecommand, telesignal or measurand at any of the existing controlled stations. The<br />
method employed to achieve this feature shall be clearly explained by the tenderer in his<br />
offer. The system shall be supplied alongwith high level language compiler (s) to enable
an authorized person without any previous knowledge of programming language to carry<br />
out the necessary amendments.<br />
(ii) Facilities shall be provided for the operator, through simple<br />
keyboard commands to:<br />
-take out of scan and control (process inhibit) any alarm<br />
point/control point/measured or a complete RTU.<br />
- 20 -<br />
-block/de-block a complete RTU as well as any control point<br />
(circuit breaker, interruptor and other equipments at the controlled station) which<br />
disables/enables control operations from the RCC. The blocked condition of any<br />
equipment shall be suitably indicated on the VDU, for example by a change in colour of<br />
the corresponding equipment display.<br />
-inhibit any alarm point which shall discontinue processing of the<br />
alarm point at the RCC.<br />
(iii) The software shall be designed for maximum portability and<br />
upgradability, so that it is generally machine independent and upgradable to meet with<br />
the developments in the computer hardware/technology.<br />
6.1.4.4.4 The software should support BROADCAST control, i.e. sequential<br />
commands to a group of equipments like circuit breakers, interruptors.<br />
6.1.4.4.5 Transmission and coding system<br />
The master station equipment shall normally scan continuosly all the<br />
RTUs in a pre-defined cyclic sequence, to update the equipment status, alarms, events<br />
and measurands. Exchange of information between the master station and the RTUs shall<br />
be on interrogation by the master followed by the reply from the RTU. The<br />
communication technique shall be based on Digital Address Time Division Multiplexing.<br />
Every data-exchange shall be based on a well defined transmission protocol based on<br />
International Standard for data transmission. Each transmitted information shall contain<br />
sufficient parity check bits so as to allow an effective error detection code to detect<br />
different combination of transmission errors. The error checking system shall have a<br />
minimum Hamming distance of four i.e. all three bit errors shall be detected one hundred<br />
percent.<br />
6.1.4.4.6 Communication pr optical<br />
The communication protocol employed in the system, including transmission security<br />
and computation of reliability factor, shall be clearly explained in the offer. The tenderer
shall confirm in the offer that the protocol employed will not allow false indications and<br />
invalid transmissions.<br />
6.1.4.4.7 Issue/cancellation of power Block<br />
- 21 -<br />
(i) Power block is generally given for maintenance of any equipment<br />
like transformer, circuit breaker, interruptor, section of OHE or any other equipment by<br />
de-energising the equipment/section of OHE. Provision shall be made for entering into<br />
the computer necessary private numbers and messaged exchanged between the field staff<br />
at site and the operator at RCC in connection with the requisition for issue/cancellation of<br />
the power block and the time duration for which the power block is given. If a power<br />
block is not cancelled at the end of the permitted duration, a message ―Power Block Time<br />
exceeded‖ shall appear on the VDU along with the equipment/section reference and time,<br />
with an audible alarm to attract the attention of the operator.<br />
(ii) When an equipment is under power block, it shall not be possible<br />
to operate that equipment unless the power block is first cancelled from the RCC. In<br />
case the telecommand for operating that equipment is attempted, a message "Equipment<br />
under power block" shall appear on the VDU.<br />
6.1.4.4.8 Indication for complementary faults<br />
The status of any bi-state device like circuit breaker, interruptor is<br />
monitored through two auxiliary contacts of the device, the status (open/ close) of the two<br />
contacts being normally complement(opposite) of each other, in the ON/ OFF condition<br />
of the device. However, when both the auxiliary contacts are either in open or in closed<br />
condition, such faults shall be detected and identified as complementary faults. The event<br />
shall be logged and suitable indication shall appear on the MDB and VDU.<br />
6.1.4.4.9. Alarm processing<br />
(i) Any and every change in the state of telesignals, uncommended<br />
change in the status of equipments like circuit breaker, interruptors, and limit violation of<br />
telemetered parameters (measurands) shall he processed as alarms.<br />
(ii) Each and every alarm shall attract the attention of the operator by<br />
an audible hooter and by a change in this display of the equipment status or change in<br />
colour of display of the telemetered parameter or change in colour of display of the alarm<br />
(telesignals) point as applicable, and the display shall start blinking (flashing). Upon<br />
acknowledgement by the operator, the audible, alarm shall cease and the display on VDU<br />
become steady.<br />
(iii) Each and every alarm that appears on any VDU display, operation.
6.1.4.4.10 Historical data storage<br />
- 22 -<br />
(a) The SCADA equipment at RCC shall be designed to cater for historical data<br />
storage of the traction power supply system data for a period of one year. This shall<br />
include:<br />
(i) All alarms/events/measurands of the controlled stations and all<br />
system alarms.<br />
(ii) Day-wise storage of average feeder current and voltage during the<br />
day, maximum demand, maximum and minimum feeder voltage, total number of<br />
operations of feeder protective relays viz OCR, DPR and WPC relays, and maximum and<br />
minimum OHE voltage at SP on both sides of the neutral section or phase break.<br />
A memory capacity of 80 MB shall be provided for this purpose in the hard<br />
disk. This required memory shall be capable of being expanded a required later. The<br />
tendrer shall indicate the details for this feature in this offer.<br />
(b) A facility shall be provided for accessing any data from the SCADA database<br />
from any other remote computer terminal/ RCC or from a centralised computer<br />
located at the zonal railway headquarters.<br />
6.1.5 UPS and batteries at RCC<br />
The tenderer shall quote for dual stand alone UPS systems of adequate<br />
capacity for supplying stabilised 240V ac, 50 Hz, single phase supply to various<br />
equipments of the SCADA system at master station. Input supply to the UPSs shall be at<br />
415V ac, 50 Hz, 3 phase with a permissible variation between +10 and -15% for the<br />
voltage and +3% and -3% for the frequency. Both the UPSs shall work in parallel to<br />
share the load of the system. However, the capacity (VA rating) of each UPS shall be<br />
designed to meet with the entire load of the system in the eventuality of the failure of the<br />
other. The taking over the load by the healthy UPS shall be automatic without effecting<br />
the normal working of the system. The failed UPS shall also disconnect it form the circuit<br />
automatically. The UPSs shall provide for trickle/normal/boost/auto charging of the<br />
battery in addition to supplying normal load to the various equipments. The UPS shall<br />
conform to relevant international standard and be suitable for operation with computerbased<br />
equipment. Alarm and mimic facilities shall be provided on the facia of the UPS<br />
for ease of operation and maintenance. The acoustic noise level generated by UPS shall<br />
be as low as possible and shall not be exceed 50 dB when working alone.<br />
A single set of storage battery of Nickel-Cadmium type shall be provided with<br />
both the UPSs. The battery shall have adequate Ah capacity to provide two hours of<br />
supply to various equipments in case of failure of input 415V a.c. supply.
6.1.6 Data-logging printers<br />
- 23 -<br />
6.1.6.1 Two alphanumeric dot-matrix printers with a printing speed or 189<br />
characters per second shall be provided. The printer shall have 132 columns with facility<br />
for friction roller and tractor paper feed. It shall be robust and noiseless.<br />
6.16.2 Data-logging<br />
a) Alarm/Event logging<br />
Logging shall be done of the following:<br />
All events such as signals and alarms, commanded and uncommanded<br />
changes and limit violations of telemetered parameters shall be printed automatically by<br />
the data-logger with date (year, month and day) and time of occurance (hours, minutes,<br />
seconds and milli-seconds) stamp.<br />
b) Diagnostics<br />
The system shall provide diagnostic checks for faults in<br />
(i) The SCADA equipment at the RCC,<br />
(ii) In the communication lines and<br />
(iii) at the controlled stations<br />
These faults shall be printed out with details such as name of controlled<br />
station, card number with date and time stamp.<br />
c) On-demand facility<br />
The facility shall be provided for the operator to obtain reports on-demand<br />
through the keyboard. Such reports may include current status of bistate devices, signals<br />
and alarms at the remote stations, communication failures, telemetry printout and other<br />
information required.<br />
d) Periodic printouts<br />
The dataloggar shall give periodic printouts, whenever required by the<br />
operator, as under:<br />
(i) 15/30 minutes printout giving average values of all the analogue<br />
parameters at TSSs and SPs during the last 15/30 minute period.
- 24 -<br />
(ii) 8 hourly printouts giving summary of all important events that<br />
occurred during the immediately proceeding 8 hours. It shall be possible to alter the<br />
format of such printouts from time to time based on changed requirements.<br />
Events that occurred during the periods when the datalogger is printing<br />
‗periodic‘ or ‗on-demand‘ reports shall not be lost but printed out thereafter with their<br />
time of occurrence stamp.<br />
6.2 Remote Terminal Unit (RTU)<br />
6.2.1 Hardware<br />
The RTU shall be microprocessor based. It shall include its associated<br />
digital input/output modules, alarm input modules, analogue Input modules, watchdog<br />
transducers, memory, modems, interposing contactors, summation current transformers,<br />
power supply unit(s) and surge arresters and other items necessary for its proper<br />
functioning. A suitably designed circuit for giving initialization pulse to the CPU at<br />
predefined interval of time, which itself shall be user selectable, shall also be provided in<br />
the RTU, so that the CPU gets initialized automatically in case it halts due to any reason.<br />
6.2.2 Reporting of events and alarms<br />
(i) All the changes (one or more) in the status of the circuit breakers*<br />
interruptors/motor-operated isolators and alarms that may occur between consecutive<br />
pollings shall be stored by the RTU until the are reported to the master station along with<br />
their time of occurrence. In other words, no event shall be lost without being reported to<br />
the master station. This feature is essential in view of the fact that the normal polling may<br />
get suspended due to failure of communication channel or other reasons.<br />
(ii) The storage capacity, in terms of number of events and alarms that<br />
the RTU can store, shall be clearly indicated in the offer.<br />
6.2.3 Power Supply Units<br />
6.2.3.1 The RTU shall normally operate off 240 V a.c., 50 Hz, single phase supply<br />
from the auxiliary transformer provided at the controlled station. This voltage may vary<br />
from 180V to 265V due to variation in the catenary voltage(25kV). In case of failure of<br />
a.c. supply, the RTU shall operate off the 110V battery. The load of the RTU shall be as<br />
low as possible and in any case shall not exceed 1 Amp at 110V d.c. power supply units<br />
required for conversion from the ac/dc supply to any other internally required voltages<br />
shall form part of the RTU.
- 25 -<br />
6.2.3.2 The ac supply will have voltage surges and spikes due to the switching<br />
ON/OFF of the traction loads. Hence the power supply units shall include suitable surge<br />
suppressors to effectively suppress the voltage surges, spikes and the electrical noise in<br />
the incoming a.c. supply.<br />
6.2.4 Parameters to telemetered/computed (measurands)<br />
6.2.4.1 The RTUs shall be designed to telemetere two feeder currents and two OHE<br />
voltages from each TSS, and two OHE voltages from each SP. The arrangement for<br />
telemetry shall be as under:<br />
(a) From TSS<br />
i) Feeder currents: Two current transducers shall be provided, one<br />
each for either side of the TSS, taking reference from the two feeder CTs of that side<br />
through a summation CT. The summation CTs shall form part of the RTU.<br />
ii) Feeder voltages: Two voltage transducers shall be provided, one<br />
each for either side of the TSS, taking reference from the two OHE PTs of that side<br />
through a suitable change-over device. In the event of supply failure in any of the PTs,<br />
The change-over device shall automatically connect the live PT to the transducer. The<br />
change-over devices shall form part of the RTU.<br />
b) From SP<br />
Voltage of the OHE on either side: Two voltage transducers shall be<br />
provided, taking reference either from the UP or DOWN line PT through a suitable<br />
change-over device which shall form part of the RTU.<br />
6.2.5 Transducers<br />
6.2.5.1 Transducers provided at the controlled stations (TTS and SP) shall be<br />
Auxiliary-powered and of quick response type with a response time not greater than 1<br />
second. They shall have linear characteristic over the entire range with accuracy of +/-<br />
0.5%. Transducers shall give an output proportional to the input from current<br />
transformers and potential transformers at the TSS and at the SP as the case may be.<br />
6.2.5.2 The salient features of CTs and PTs provided at the TTS. SSPs, SPs are at<br />
Annuxure-3.
- 26 -<br />
6.2.5.3 The voltage at TSS and SP may rise to 30kV for short durations and the<br />
apparent power of the traction power transformer may go upto 200% for 5 minutes<br />
intermittently.<br />
6.2.5.4 Current transducers shall be rated for a 100% overload for 5 minutes and<br />
short time current rating of 50 Amps for 5 second. The burden of voltage and current<br />
shall not normally be more than 4 VA.<br />
6.2.5.5 Since the current transducers shell be connected in series with the<br />
operating coils of protective relays, it is, therefore, essential that loose connections or<br />
open circuiting shall be avoided so as to prevent damage to the CTs and render the<br />
protective system at the TSS ineffective. It shall, therefore, be ensured that:<br />
i) The transducer case is so designed that the current coil terminals<br />
are automatically short circuited in case the transducer is taken out. Labels shall be<br />
provided to notify this aspect prominently.<br />
ii) All terminal connections are rigid.<br />
iii) Wiring to the current coil of transducer is done with PVC insulated<br />
copper cable of cross section not less than 4 sq mm.<br />
6.3 System alarms<br />
The system alarm that shall be provided include at least:<br />
i) Remote station defective<br />
In the event of partial or complete failure of the RTU to communicate with the<br />
master station due to failure of RTU, or on failure of individual I/O modules and other<br />
modules in the RTU, this alarm shall appear. The exact nature of fault shall be indicated<br />
on the VDU.<br />
ii) Master Station defective<br />
In the event of failure of any equipment at master station such as modem,<br />
CPU, bus driver, computer, mimic driving modules or any other items, this alarm shall<br />
appear. The exact nature of fault shall be indicated by LEDs on an indication panel or the<br />
individual module inside the equipment cabinet.<br />
iii) MDB panel fuse fail<br />
In the event of failure of the fuse provided inside the mimic panel for<br />
controlling the supply to various indication lamps/LEDs on the MDB, this shall appear.
6.4 Equipment capacity<br />
- 27 -<br />
6.4.1 Number of controlled stations<br />
The number of controlled stations to be commissioned initially is indicated<br />
in the particular specification referred to in clauses 10 beroof. However, the SCADA<br />
equipment at RCC shall be designed and engineered to control about <strong>12</strong>0% of the number<br />
of stations to be commissioned initially. The extra capacity shall be available for<br />
expanding the system in future. It shall be possible to realize the extra capacity simply by<br />
adding the required functional modules in the spare sub racks of the mimic driver and<br />
incorporating. Necessary changes in the software and MDB at RCC, without affecting the<br />
existing system either physically or operationally.<br />
6.4.2 Number of telecommands, telesignals and telemetered parameters<br />
(measurands)<br />
6.4.2.1 The SCADA equipment shall be designed for the following capacity of<br />
telecommands, telesignals and telemetered parameters for a typical TSS, SSP, SP and<br />
ATP of a double line section.<br />
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -<br />
S. No. Controlled Telecommands Telesignals Measurands<br />
station<br />
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -<br />
1 TSS 24* 88 8<br />
2 SP 8* 20 4<br />
3 SSP 8 <strong>12</strong> -<br />
4 ATP - 8 -<br />
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -<br />
* No of telecommands for faultlocator is not included, it is to be added where applicable.<br />
6.4.2.2 The above figures may vary depending on the layout of TSS, SP, SSP and<br />
ATP in a particular section, which could have three or more tracks, the details of which<br />
will be contained in the particular specification referred to in clause-10 hereof.<br />
6.4.2.3 The number of parameters to be commissioned initially may be less than the<br />
above figures and the balance designed capacity shall be available for future use. A<br />
typical requirement of telecommands, telesignals and telemetered parameters on a double<br />
line section is at Annexure-I.
6.4.2.4 In order to cater for the above requirements the SCADA equipment shall be<br />
designed such that:<br />
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(i) (a) The equipment at the various controlled stations is complete in all<br />
respects for the total number of telecommands, telesignals and telemetered parameters to<br />
be utilised initially.<br />
(b) For the balance designed capacity of these parameters, the<br />
equipment is complete in all respects except for the provision of realisable simply by<br />
inserting the interposing contactors/relays/transducers in position as and when required.<br />
For this purpose the wiring shall be terminated at the exact location where the<br />
contactor/relay/transducer is to be provided, in suitable relay bases/terminal blocks.<br />
(ii) The equipment at the RCC shall be designed, engineered and wired<br />
for the designed capacity of telecommands, telesignals and measurands such that the<br />
balance designed capacity can be embedded in the software by making necessary<br />
modification and by inserting necessarily input/output modules in the sub-rack of the<br />
mimic driver.<br />
6.4.2.5 Each telecommand shall include transmission of both ―ON‖ and ―OFF‖<br />
control commands for a circuit breaker/interruptor/motor operated isolator or any other<br />
bi-state device and shall also include corresponding ―ON‖ and ―OFF‖ status telesignals of<br />
the device concerned, confirming execution of the telecommand at the controlled station.<br />
6.4.2.6 The number of telesignals stipulated for each controlled station shall be for<br />
the exclusive use of the railways and shall not include telesignals required for reporting<br />
defects in the RTU.<br />
6.4 Speed of transmission and update time<br />
6.5.1 The communication between the master station and the RTUs shall be at a<br />
suitable transmission speed not exceeding 600 baud, in the case of the trunk cable<br />
specified in clause-5.8 hereof. The normal polling time for updating of status, alarms and<br />
measurands for the designed capacity of controlled stations and for the design capacity of<br />
telecommands, telesignals and measurands shall be not more than 4 seconds for 20<br />
controlled stations and not more than 6 seconds for 30 or more controlled stations.
- 29 -<br />
6.5.2 Whenever the number of controlled stations is more than 30 and the RCC<br />
is located somewhere in the middle of the section, the controlled stations on one side of<br />
the RCC shall be polled simultaneously in parallel with the controlled stations on the<br />
other side RCC, so that the cyclic update time is kept to the barest minimum. The master<br />
station equipment configuration shall be suitable for such simultaneous polling.<br />
6.6 Priority of data exchange between master station and RTUs<br />
While the master station shall normally be polling the RTUs cyclically, the<br />
telecommands shall receive the highest priority. The normal polling shall get interrupted<br />
for sending the telecommand and for receiving the telesignal from the RTU for change of<br />
status resulting from execution of telecommand before normal polling restarts.<br />
6.7 Priority of data exchange between RTUs and Master Station<br />
During polling, the RTU shall transmit data to the master station in the<br />
order of importance. Any tripping of feeder circuit breaker on fault (relay operation) shall<br />
get the highest priority.<br />
6.8 Modems<br />
(i) The modems provided for communication between the master<br />
station and the RTUs shall utilize frequency shift keying (FSK) modulation and include.<br />
Receive and timing functions. The send and receive functions shall be independently<br />
programmed as required. The modem shall work satisfactorily up to an input signal level<br />
of -45dbm. It shall also perform a watch dog role and turn the transmitter off in the event<br />
of any fault occurring within the equipment.<br />
(ii) The modem shall also incorporate necessary amplifiers having a<br />
minimum gain of 30 db to compensate for any signal variation at different point of the<br />
system. Suitable attenuation pads shall be provided within the amplifiers to adjust the<br />
level through trimpot/rotary switch. It shall have an output signal level adjustment<br />
between 0 and 30 dbm in steps of 1 dbm.<br />
(iii) A test switch on the modem shall allow a square wave data pattern<br />
to be transmitted continuously at maximum band rate to allow receiver levels and bias<br />
distortion to be set.
6.9 Construction of the SCADA equipment<br />
6.9.1 The word ―equipment‖ in this clause refers to both master station<br />
equipment and RTUs.<br />
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6.9.2 The equipment shall be housed in dust and vermin proof steel cabinets<br />
with doors in the front and rear. The doors shall have proper looking arrangement. The<br />
cabinets shall have facility for bottom entry of incoming/outgoing cables for operation of<br />
the equipment. The steel sheet used for making the cabinets shall be of thickness not less<br />
than 1.6mm and shall be reinforced wherever required. The sheet steel as well as other<br />
iron/steel work shall be properly treated and then applied an under-coat suitable to serve<br />
as base and binder for the finishing coat. The exterior and interior surfaces and the base<br />
frame of the cabinets shall be epoxy power coated in shade to be mutually decided later<br />
between the supplier and the purchaser.<br />
6.9.2.1 The dimensions of the RTU cabinets at TSS and SP/SSP shall not exceed<br />
1750 mm x 800 mm x 650 mm and 1450 mm x 800 mm x 650 mm respectively. At ATP<br />
the RTU cabinet shall preferably be wall mounted type. Every endeavour shall be made<br />
by the manufacturer to offer as small a cabinet as possible. It may be noted that all the<br />
SCADA equipment at RTUs shall be housed inside the cabinet. Provision of subcabinet(s)<br />
and/or wall mounted relay/transducer cabinet(s) shall not be permitted.<br />
6.9.3 Integrated circuits (ICs) shall be used to the maximum extent and discrete<br />
components avoided. All semi-conductor components including TCs shall be burnt in<br />
accordance with relevant specification to minimize infant mortality failures. Use of<br />
potentiometers and electro-mechanical devices like relays shall be kept to the absolute<br />
minimum. The number of makes and type of components used shall also be kept to the<br />
minimum. The components shall be from reputed manufacturer, of best quality and wallproved<br />
in services.<br />
6.9.4 The manufacture of the equipment shall be based on modern practice with<br />
up-to-date technique in order to achieve a robust, versatile and economical construction.<br />
The entire equipment shall be so designed that components/parts of similar equipment<br />
shall be conveniently interchangeable. The entire equipment shall be divided and wired<br />
up in easily removable compact units to facilitate quick attention or replacement by<br />
similar units, without necessitating any soldering or similar messy process. Modular type<br />
of construction shall be adopted to facilitate unit replacement of devices where required.<br />
The solid state components shall be laid out, assembled and arranged in form of printed<br />
cards. Standard plug-in and connector arrangement shall be made for the printed cards so<br />
that contacts and good and firm and arc not affected due to vibrations. Facility of guide
- 31 -<br />
channels and other such aids shall also be incorporated liberally to ensure that printed<br />
cards are properly inserted. The printed circuit cards shall be assembled vertically in<br />
standard 40cm (19‖) sub-racks which are fixed on the main frame of the cabinets.<br />
Suitable check points/diagnostic indications shall be provided on the card for monitoring<br />
its healthiness.<br />
6. 9.5 All the sub-systems and system including modules shall be burnt in for at<br />
least 72 hours at the works of the manufacturer to prove the quality and workmanship.<br />
6.9.6 Suitable labels of approved design shall be provided on all the equipment.<br />
These labels shall contain information related to identification of the equipment and<br />
safety instruction if any.<br />
6.9.7 The equipment and the circuitry shall be such as to provide affective<br />
means to check for correct generation, transmission as well as reception of all signals and<br />
that failure due to internal defects of the equipment or to external disturbances on<br />
transmission circuits shall not cause mal-operation.<br />
6.9.8 The equipment shall be designed and mounted in such a manner that<br />
inspection, cleaning, testing, repairs and renewals, if any, can be carried out conveniently<br />
and expeditiously. Facility for expedition checking of operation of equipment under<br />
working condition shall be provided.<br />
6.9.9 The equipment shall be wired with PVC insulated copper conductors of<br />
adequate size, screened wherever necessary. All wiring shall be suitably colour coded for<br />
easy identification. The bunches of wires shall be neatly dressed and cleated/supported<br />
suitably. Separate wire bunches shall be run for AC & DC power circuits, control and<br />
signal circuits.<br />
6.9.10 All soldering shall be done with good quality solder at proper temperature<br />
to avoid dry soldering.<br />
6.9.11 All the cables which are laid in the cable trenches for the purpose of<br />
interconnecting various equipment shall be rodent proof.<br />
6.9.<strong>12</strong> Each type of input/output module employed in the equipment shall be<br />
designed for handling not more than 8 telecomands, 16 status inputs (5 ON+8 OFF), 16<br />
telesignals/alarms or 8 measurands.
- 32 -<br />
6.9.13 All the equipments viz. computer, VDUs, key-boards, date logging<br />
printers etc. and components used in the SCADA system shall be of industrial grade. A<br />
certificate to this effect shall be furnished by the tederer.<br />
6.9.14 The micro-computers used, If any, shall be IBM compatible.<br />
6.9.15 The mimic-driver cabinets and the layout of the traction power supply<br />
diagrams on the MDB shall be so designed as to convert any SP to TSS, if required, by<br />
simply adding the required modules in the mimic driver and making minimum changes in<br />
the MDB.<br />
6.9.16 Construction of MDB<br />
(i) The MDB shall normally be not more than 3.5 m in length for 30<br />
controlled stations, 0.75 m in height and 0.2 m in width, and shall be desk-top/pedestal<br />
mounted close to the operator.<br />
(ii) The MDB shall be made of steel of thickness of 1.6 mm, reinforced<br />
wherever necessary. To prevent corrosion the steel work shall be properly treated and<br />
then given a primary coat of zinc chromate, both on the interior and exterior surfaces<br />
followed by two coats of finishing enamel paint. The inner side shall be finished with<br />
stoved enamel white paint. The external surface shall be finished with stoved enamel<br />
paint of opaline green shade number 275 as per IS:5 or any other colour decided by the<br />
railways, evenly sprayed to present a smooth and pleasing appearance.<br />
(iii) Mimic display of catenary shall be by means of LEDs and metal strips. The<br />
tederer may however offer any other state-of-the-art technique for consideration as an<br />
alternative offer.<br />
(iv) Each circuit breaker & interruptor shall be depicted with the help of a 3<br />
legged LED on the MDB. The LED shall emit red/green colour to indicate<br />
CLOSE/OPEN status respectively. The complementary fault shall be indicated by yellow<br />
colour or dark state of the LED.<br />
(v) Whenever any of the sub-sectors of OHE gets de-energised, the<br />
corresponding portion shall be lit up and start flashing until acknowledged by the<br />
operator.<br />
(vi) The scheme of connections, identification numbers for circuit breakers,<br />
interruptors and motor operated isolators, if any, and other indications on the MDB shall
e so engineered that they are clearly and distinctly visible from a distance of four<br />
meters.<br />
- 33 -<br />
(vii) The MDB shall be wired with PVC insulated copper conductors of adequate<br />
size, screened wherever necessary. All wiring shall be suitably colour coded for easy<br />
identification, neatly arranged and adequately supported. The wiring shall be kept to the<br />
barest minimum and undue losses therein avoided.<br />
6.10 Fuses & Fuse holders<br />
The fuses and holders used for various circuits at the RCC as well as at the<br />
controlled stations shall be of approved quality non-deteriorating cartridge type.<br />
Rewirable type fuses shall not be used unless specific prior approval has been obtained<br />
form the purchaser.<br />
6.11 Cables<br />
Cables of different colours shall be used ac and dc supplies of various<br />
voltage at the RCC as well as at the controlled stations for easy identifications. The 240<br />
V ac cable shall be routed separately for easy identification by the maintenance staff .<br />
Caution plated should also be provided near the terminal connections.<br />
6.<strong>12</strong> Special requirements of SCADA equipment<br />
6.<strong>12</strong>.1 Tripping of bridging circuit breakers on undervoltage at SP<br />
i) Instantaneous type under voltage circuits shall be provided at the SPs,<br />
operated off 27500/110V potential transformers and designed to trip the bridging circuit<br />
breakers if the catenary voltage drops below a preset limit. The operating range for the<br />
circuit shall be adjustable between 15,000V and 20,000V continuously, in steps of<br />
1,000V.<br />
ii) The arrangement shall be such that the bridging circuit breakers can be<br />
closed only when the section on one side of neutral section is dead and the undervoltage<br />
circuit shall become operative only after the bridging circuit breakers is closed.<br />
6.<strong>12</strong>.2 Interlock release-request facility for circuit breakers/interruptors<br />
control at boundary post
- 34 -<br />
When a controlled station separates the zones controlled by two adjacent<br />
RCCs, control of breakers/interruptors at this controlled station shall be so arranged that<br />
the breakers/interruptors can be operated from one RCC only when an interlock is<br />
released from the other RCC.<br />
6.<strong>12</strong>.3 Auto reclosing scheme for feeder circuit breaking at TSS<br />
(i) In case of tripping of the feeder circuit breaker on fault at TSS, a<br />
single-shot auto-reclosing scheme recloses that breaker automatically only once, after a<br />
pre-set time delay.<br />
(ii) In the event of any fault on OHE persisting, the feeder circuit<br />
breaker trips again and the auto-reclosing scheme gets automatically ― locked-out ‖ to<br />
prevent reclosing of the breaker a second time. The locked-out condition shall be<br />
telesignalled to RCC. The ―locked-out‖ condition shall be released by the operator when<br />
a telecommand is initiated through the key board console.<br />
(iv) Drawing No.<strong>ETI</strong>/FSI/0231-1, at appendix-5, indicates the autoreclosing<br />
scheme. While the relays of the auto-reclosing scheme are provided be the<br />
Railways along with other protective relays panel at TSS. The wiring between<br />
autoreclosing scheme and SCADA equipment at TSS shall be supplied and installed by<br />
the successful tederer.<br />
6.<strong>12</strong>.4 Automatic localisation of OHE faults<br />
6.<strong>12</strong>.4..1 This feature of automatic fault localization of OHE faults by the SCADA<br />
system is required in cases where the fault locators described in clause 6.<strong>12</strong>.5 are not<br />
provided.<br />
6.<strong>12</strong>.4.2 The system shall be designed for automatic localisation of faults in OHE,<br />
segregation of faulty sub-sector/broken sub-sector and restoration of 25 kV power to<br />
healthy sections of OHE, through a suitable software package incorporated in the<br />
SCADA system. The fault localisation process shall be initiated by the operator through<br />
the key board console.<br />
6.<strong>12</strong>.4.3 In general, the fault localisation process shall employ the technique of<br />
energising all the sub-sectors/broken sub-sectors that were live prior to the fault one after<br />
the other until it identifies the faulty sub-sector/broken sub-sector by the tripping of the<br />
feeder circuit breaker.
6.<strong>12</strong>.4.4 The system shall also take following into account while localising the fault<br />
automatically:<br />
- 35 -<br />
(i) Power block(s) imposed on an interruptor:<br />
Whenever power block is imposed on any interruptor, no further control<br />
on that interruptor shall be possible from the master station. For the purpose<br />
of fault localisation, such interruptors shall be assumed as ―open‖.<br />
(ii) Discontinuity caused in any sub-sector due to imposition of power<br />
block on an elementary section of that sub-sector.<br />
6.<strong>12</strong>.4.5 The software adopted for the fault localisation and isolation process shall:<br />
(i) Take into account the inputs entered by the operator as described<br />
above.<br />
(ii) Ensure that no interruptor that was open prior to the occurrance of<br />
fault by is closed during the fault localization process.<br />
(iii) Segregate the fault by opening minimum number of interruptors.<br />
6.<strong>12</strong>.5 AT Neutral current ratio type fault Locator.<br />
6.<strong>12</strong>.5 A special equipment, called AT neutral current ratio type fault locator<br />
(hereinafter referred to as fault locator), may be provided by Railways at the Traction<br />
Sub-stations, Switching Stations (SSP/SP) and at Auto Transformer Posts (ATPs) for<br />
locating catenary/feeder to earth fault on the OHE. The term ― Neutral current ‖ refers to<br />
the current that flows in the connections between the midpoints of the auto-transformers<br />
(ATs)/secondary winding of traction transformer and earth. For the descriptions which<br />
follow reference may be made to the relevant diagrams in Appendix 6.<br />
6.<strong>12</strong>.5.2 Principle of working of fault locator:<br />
6.<strong>12</strong>.5.2.1 Measurement of neutral currents.<br />
Whenever a catenary/feeder to earth fault occurs on the OHE, the<br />
corresponding feeder protective relay(s) operates causing the master trip relay to operate<br />
and trip the concerned feeder circuit breaker. One contact of the master trip relay is used<br />
for sending a trip signal to the feeder circuit breaker while another contact is used for<br />
sending an initiate‘ command to the fault locator at the TSS. On receipt of the initiate
- 36 -<br />
command, the fault locator at the TSS starts measuring the neutral current of the autotransformers/traction<br />
power transformer at the TSS, and sends a ―Fault Start‖ signal to<br />
the other fault locators at the switching stations/ATPs upto and including the SP In case<br />
of normal feeding condition, and upto and including the adjacent TSS in case of extended<br />
feeding condition through the telecommunication cable. On receipt of the fault-start<br />
signal, the fault locators start measuring the neutral currents of the auto-transformers. The<br />
measurement takes about 40 ms from the instant the master trip relay at the TSS has<br />
operated. The neutral currents measured are stored in the fault locators in Binary Coded<br />
Decimal (BCD) form in two digits (8 bits).<br />
6.<strong>12</strong>.5.2.2 Transmission of neutral currents data to RCC.<br />
After a neutral current measurement, the fault locator transmits a ―RTUstart‖<br />
signal to the remote terminal unit (RTU) by closing a normally open contact. On<br />
receipt of the RTU-start signal, the RTU will receive and store the neutral current data<br />
(which is in 11 bits-8 bits for neutral current and 3 bits for AT number) and send a ‗Reset‘<br />
signal to the fault locator to re-set the fault locator for further operation. The neutral<br />
current data so received shall be transmitted to the master station equipment by the RTU<br />
during the normal scanning.<br />
6.<strong>12</strong>.5.2.3 Calculation of the kilometerage of the fault point.<br />
After receiving the neutral current data from all the RTU‘s in the zone fed<br />
by the feeder circuit breaker which tripped under fault, the kilometerage of the fault point<br />
shall be calculated by the master station equipment in accordance with the procedure<br />
given below:-<br />
(i) Pick up the two neighbouring auto-transformers which recorded the highest<br />
and second highest neutral currents.<br />
(ii) Calculate the kilometerage of the fault point by using the following<br />
equation:<br />
Ln+1 – Ln In+1<br />
L = Ln+ x (100 x - Q1)<br />
100-Q1-Q2 In + In+1
where,<br />
Ln, Ln+l = kilometerage of the ATs which recorded the highest/second highest<br />
neutral currents.<br />
In, In+1 = The neutral currents recorded by the ATs at the location Ln, Ln+1<br />
respectively.<br />
Q1, Q2 = Constants for the ATs concerned (varying between 5 and 15).<br />
L = kilometerage of the fault point.<br />
- 37 -<br />
6.<strong>12</strong>.5.2.4 After calculating the kiloneterage of the fault point, a suitable message<br />
shall appear on the VDU, giving the kilometerage of the fault point, TSS/SSP/SP/ATPs<br />
concerned. The massage shall also be printed by the data-logger.<br />
6.<strong>12</strong>.5.2.5 For the purpose of calculating the kilometerage of the fault point, the<br />
master station equipment shall have the kilometerage of the ATs and the constants for all<br />
the ATs required for the calculation stored in the data-base of the SCADA software. It<br />
shall be possible to store two different kilometerage for an AT (i.e. one kilometerage for<br />
each of the two directions) to cater for situations where the reference point for the<br />
kilometerage may change the kilometerage/constants in the data-base by simple<br />
operations by the operator as and when necessary.<br />
6.<strong>12</strong>.5.3 Number of neutral currants at TSS/SP/SSP/ATP.<br />
The interfacing between the fault locator and the RTU shall be for two<br />
neutral currents in case of a TSS/SP (one neutral current for each of the two directions),<br />
and one neutral current in case of a SSP/ATP. However, where a TSS feeds only one<br />
direction, the interfacing at the TSS is required only for one neutral current.<br />
6.<strong>12</strong>.5.4 Call-start tele-command for TSS<br />
Provision exists in the fault locator at the TSS for checking the functioning<br />
of the fault locators by sending a ―Call-start‖ signal to he fault locator at the TSS. For this<br />
purpose two call-start tele-commands shall be provided in the SCADA system for each<br />
TSS, one tele-command for each of the two directions from the TSS. However, where a<br />
TSS feeds only in one direction, only one call-start tele-command is required.<br />
6.<strong>12</strong>.5.5 Feed extend/Food normal tele-command for SP.<br />
Whenever feed is extended from one TSS to the adjacent TSS, it is<br />
necessary to send a ‗feed-extend‘ tele-command‘ to the fault locator at the SP between<br />
the two TSSs. Similarly, whenever the feed is restored to the normal condition, it is<br />
necessary to send a ‗feed-normal‘ tele-command to the fault locator at the SP. For this<br />
purpose two tele-commands shall be provided shall be provided in the SCADA system
- 38 -<br />
for each SP one tele-command will make a potential-free normally open contact in the<br />
RTU ―Closed‖(for extended feed condition), the other tele-command will make the<br />
normally open contact ―Open‖ (For normal feed condition).<br />
6.<strong>12</strong>.5.6 Strong and VDU display of neutral currents.<br />
Whenever neutral currents are received at the master station from the<br />
RTUs in the feeding zone of a TSS, the neutral currents data shall be stored in memory.<br />
The SCADA software shall support VDU display of the neutral current in the tabular<br />
form to indicate date/time, dispatch station, data received and neutral current value. It<br />
shall be possible to have a print out of the same on the data-logger.<br />
6.<strong>12</strong>.5.7 Wiring.<br />
The supply of cables and wiring between the fault locator and the RTU<br />
shall be done by the successful tenderer.<br />
6.<strong>12</strong>.5.8 The telecommands for the fault locator at TSS/SP and telemetry of neutral<br />
currents data have not been catered for in the equipment capacity specified in clause<br />
6.4.2. The requirements given in clauses 6.<strong>12</strong>.5.1 to 6.<strong>12</strong>.5.7 above shall be catered for in<br />
the SCADA system in addition to that stipulated in clause 6.4.<br />
6.13 Tripping of feeder circuit breaker in case of PT fuse failure<br />
The SCADA system shall cause the feeder circuit breaker to trip in case<br />
the fuse of the associated potential transformer fails.<br />
7.0 Instruments, Testing Equipment and Tools<br />
7.1 The tenderer shall quote for the following giving unit prices of individual<br />
items:<br />
(i) Instruments including two level meters, two portable dual trace<br />
oscilloscope (0-25 MHz) and four digital multimeters required for the maintenance and<br />
xxxx of the equipment offered, pamphlets giving full technical and other details of the<br />
instruments shall be furnished along with the offer.<br />
(ii) Diagnostic kit and logic probes for ―on-line‖ and ―off-line‖<br />
trouble-shooting and repairs. The diagnostic kit shall be comprehensive and capable of<br />
testing all types of modules employed in the SCDA equipment for their normal<br />
functioning and to identify the faulty zone.<br />
(iii) Any other standard or special testing and diagnostic equipment<br />
necessary for preventive as well as corrective maintenance of the various<br />
parts/components of the SCADA equipment.<br />
equipment.<br />
(iv) Complete set of tools required for maintenance of the SCADA
7.2 The required quantity of instruments, test equipments and tools shall be<br />
indicated to the successful tenderer at the time of issue of the contract.<br />
8.0 Spares<br />
8.1 The tenderer shall quote for spares as indicated below for the SCADA<br />
equipment:<br />
- 39 -<br />
i) Modules of various types (including 10% of each type<br />
power supply units) used at RCC.<br />
ii) Modules of various types (including 10% of each type<br />
power supply units) used at controlled stations.<br />
iii) Spare transducers and summation CTs One of each type<br />
iv) Interposing relays 10% of each type<br />
v) Components such as critical ICs 20% of each type<br />
vi) Read relays 20% of each type<br />
vii) Various types of lamps/LEDs used 10% of each type<br />
on MDB<br />
viii) Spares for individual items As considered<br />
such as printer etc necessary for<br />
a period of<br />
2 years.<br />
ix) Spare keyboard for VDU one<br />
8.2 The tenderer shall confirm in his offer the availability of spares for a<br />
period of 15 years after commissioning of the equipment.<br />
9.0 Technical deviations<br />
The tenderer shall specifically indicate in a statement attached with his<br />
offer, his compliance with each clause and sub clause of this specification. A separate<br />
statement shall be attached with the offer indicating reference to the clauses where the<br />
tenderer deviates therefrom together with detailed remarks/justification. If either the
statement of compliance or statement of deviations is not attached with the offer, it is not<br />
likely to be considered. If there are no deviations, a ‗NIL‘ statement shall be attached.<br />
10.0 Particular specification<br />
- 40 -<br />
Particular specification giving details of the location of RCC, repeater<br />
the purchaser. stations, stations to be controlled, number of telecommands, telesignals<br />
and telemetered parameters at each on the controlled stations and other detail will be<br />
furnished separately by the purchaser.<br />
11.0 Type Tests<br />
11.1 The type tests shall be carried out in the presence of the purchaser‘s<br />
representative at the manufacturer‘s works on a complete set of equipment (sending end<br />
and receiving end) to prove the quality of the design and workmanship and there<br />
conformity with the specification. If any of the type tests on components have already<br />
been successfully carried out, repetition of such tests may be waived, provided photostat<br />
copies of the type tests certificates and other particulars are submitted and got approved<br />
by the purchaser.<br />
11.2 Before giving the call to RDSO/the Chief Electrical Engineer for<br />
inspection and testing of the prototype of the system, the manufacturer shall submit a<br />
detailed test schedule consisting of schematic circuit diagrams for each of the tests and<br />
nature of the test, venue of the test and the duration of each test and the total number of<br />
days required to completer the test at one stretch. Once the schedule is approves, the test<br />
shall invariably be done accordingly. However, during the process of type testing or even<br />
later, RDSO representative reserves the right to conduct any additional test(s) besides<br />
those specified herein, on any equipment/sub-system or system so as to test the system to<br />
his satisfaction or for gaining additional information and knowledge. In case any dispute<br />
or disagreement arises between the manufacture and RDSO/the Chief electrical Engineer<br />
during the process of testing as regards the type tests and/or the interpretation and<br />
acceptability of the type test results, it shall be brought to the notice of the Director<br />
General(Traction Installations), RDSO/the Chief Electrical Engineer as the case any be,<br />
whose decision shall be final and binding.<br />
11.3 The type tests shall include visual inspection, insulation resistance test,<br />
power frequency high voltage withstand test, functional tests, operational tests and test on<br />
major components. The detail of tests to be carried out shall be finalized by mutual<br />
consultation between the purchaser the successful tederer.
- 41 -<br />
11.4 Only after clear written approval of the result of the tests on the prototype<br />
unit is communicated by RDSO/Purchaser to the manufacturer, shall be take up bulk<br />
manufacture of the ordered equipment which shall be strictly with the same materials and<br />
processed adopted for prototype unit. In no circumstances shall the material, other the<br />
those approved in the design/drawings and/or prototype.<br />
11.5 The successful tenderer shall be required to supply 3 sets of type test<br />
reports to the purchaser.<br />
<strong>12</strong>.0 Erection and Commissioning tests<br />
The creation and commissioning of SCADA equipment shall be done bye<br />
the successful tenderer who will arrange all tools, plants, instruments and other materials<br />
required for the purpose at his own cost. Tests shall be carried out during creation/<br />
commissioning of the equipment at site. The successful tenderer shall be required to<br />
submit to the purchaser the details of the checks and tests to be carried out during<br />
erection and commissioning.<br />
13.0 Tests after installation and commissioning of the equipments<br />
Tests shall be carried out on the complete equipment in the presence of the<br />
purchaser representative to check the erection and commissioning of the equipment. This<br />
shall include functional tests, checking of adjustment of transducers, limit settings of<br />
measurands, cyclic update time, telecommand execution time, signal levels both on the<br />
send and receive side of the various modems for satisfactory operation of the equipment,<br />
and others. Three sets of the test report shall be supplied to the purchaser for record.<br />
14.0 Technical data, Drawings and Information<br />
14.1 The tenderer shall furnish guaranteed performance data, technical an other<br />
particulars of the equipment offered in the proforma at annexure -2.<br />
14.2 The information furnished in schedule of guaranteed performance data,<br />
technical and other particular (Annexure-2) shall be complete in all respects. If there is<br />
any entry like shall be furnished later or blanks are left against any item, the tender is not<br />
likely to we considered as such omissions causes dele in finalising the tender.<br />
14.3 The tenderer shall submit alongwith his offer the following:
- 42 -<br />
a) System diagram of the SCADA equipment showing general layout of<br />
RTUs and and there connection with waster station equipment through<br />
communication cables.<br />
b) Hardware configuration of master station equipment.<br />
c) Hardware configuration of RTUs (TSS, SSP, SP and ATP).<br />
d) Software configuration of mater station equipment.<br />
e) Software configuration of RTUs.<br />
f) A write-up explaining the principle of operation of the equipment.<br />
g) The General arrangement drawing of the HDB at RCC, indicating the<br />
catenary indications, equipment status indications, aanunciations and lettering for<br />
controlled station.<br />
h) The General arrangement drawing of waster station equipment cabinet,<br />
showing module layout.<br />
i) The General arrangement drawing of RTU cabinet (TSS,SSP,SP and ATP)<br />
showing module layout, transducers and interposing relays.<br />
j) A detailed write-up giving the details of SCADA software including the<br />
communication protocol and transmission security.<br />
k) Any other detail considered necessary for the proper the understanding of<br />
the system.<br />
<strong>NO</strong>TE: The general arrangement drawing should also indicate the overall<br />
dimensions as well as mounting details.<br />
14.4 The successful tenderer shall be required to submit the following:<br />
a) Detail drawings for approval of the purchaser in Railways standard<br />
sizes of 210mm x 297mm or any internal multiple thereof. These drawings shall cover<br />
schematic circuit diagrams, block diagrams, layout of equipment at RCC and at<br />
controlled stations, constructional details of various equipment at RCC and at controlled<br />
stations, layout of various modules in equipment cabinets at RCC and at controlled<br />
stations, interconnection diagram between Railways power equipment and remote control<br />
equipment, and wirings diagrams. The manufacture of the equipment shall be taken up by<br />
the successful tenderer, only after approval of the drawings by the purchaser.<br />
equipment.<br />
b) Circuit schematic and explanation with full technical details of the
- 43 -<br />
c) Detailed step by step procedure for operation, maintenances and<br />
repairs of the system and individual equipments, indicating procedure for troubleshooting,<br />
measurement of various signals at different points and diagnostic check to be<br />
adopted for repairs at site.<br />
d) Details of various RCC modules indicating rating and modification<br />
number and layout of equipment.<br />
10 Details of SCADA software, including operating instructions.<br />
14.5 Only after all the designer and drawings have been approved and<br />
clearance given by RDSO to this xxxx the manufacturer shall take up manufacturer of the<br />
prototype unit for RDSO inspection. It is so clearly understood that any change required<br />
to be done in the prototype unit as required RDSO shall be done expeditiously.<br />
14.5 The successful tenderer shall be required to supply 3 prints of the final<br />
approved drawings and 3 dates of reproducible tracings.<br />
14.6 The successful tenderer shall supply 10 copies of technical booklets giving<br />
detailed description of the equipment, constructional features, ratings and characteristics<br />
and instruction for operation and maintenance of the system as well as of individual<br />
equipment.<br />
15. Training of Railway staff<br />
The offer shall include the training of two Engineers and six Supervisors<br />
of the Indian Railways free of cost at the manufacturers in India and abroad. The total<br />
duration of training shall be <strong>12</strong> weeks, of which approximately six weeks will be at<br />
manufacturers works and six weeks on a railway system or 0ther pubic utility. The cost of<br />
travel to the country of manufacture and back will be borne by the Indian Railways.<br />
Other details shall be settled at the time of finalising the contract or purchase order.<br />
The training shall cover the following aspects:<br />
a) Study of system engineering and trouble shooting of all modules<br />
and system faults.<br />
b) Training in operation of SCADA equipment and Man-Machine<br />
interaction.<br />
c) Erection, testing, commissioning and adjustments required in<br />
service of the equipment.<br />
16. Warranty<br />
16.1 The SCADA equipment supplied against a purchase order/contract in which<br />
this specification is quoted, irrespective of origin of individual equipment<br />
(imported/indigenous), shall be guaranteed for trouble-free and satisfactory performance<br />
for a period of 18 months from the date of supply or <strong>12</strong> months from the date of
- 44 -<br />
commissioning, whichever period is shorter. Details of warranty clause, the extent of<br />
responsibility and other relevant aspects shall be included in the purchase order or<br />
contract. The tenderer shall furnish detailed terms and conditions in this regard in his<br />
offer.<br />
16.2 The successful tenderer shall make necessary arrangements for closely<br />
monitoring the performance of the SCADA equipment through periodical (preferably<br />
once in two months during the warranty period) visits to the RCC and the various<br />
controlled stations for on the spot detailed observations. Arrangements shall also be made<br />
for spare parts, modules and other items to be kept readily available with the<br />
manufacturer/supplier/successful tenderer to meet exigencies warranting replacement, so<br />
as to put back the SCADA equipment in service without unduly affecting the operations<br />
of the Traction Power Controller.
- 45 -<br />
ANNEXURE-I<br />
TYPICAL REQUIREMENT OF TELECOMMANDS, TELESIGNALS<br />
AND TELEMETERED PARAMETERS IN A DOUBLE LINE SECTION AT TSS,<br />
SP, SSP AND ATP<br />
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -<br />
DESCRIPTION TSS SP SSP ATP<br />
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -<br />
A. Telecommands<br />
1. 220/132/110/66 kV 2 (3)* - - -<br />
circuit breakers<br />
2. 25 kV circuit breakers 10 (9) 2 - -<br />
3. 25 kV Interrruptors 2 2 5 -<br />
4. Auto-recloser ―Release‖ 4 - - -<br />
With locked out indication<br />
5. Transformer tap changer 2 (3) - - -<br />
6. Interlock release request (as applicable) - - -<br />
at boundary post<br />
7. Spares (for locoshed feeders 4 (3) 4 3 -<br />
motorized isolators, etc.<br />
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -<br />
Total: 24** 8** 8 -<br />
- - - - - - - -- - - - - - - - - - - - - - - - - - - - - - - - - - - -<br />
* The figures given in the brackets are for traction substation having three<br />
single phase (V-connected) transformers.<br />
The figures given outside the brackets are for traction substation having two<br />
scott-connected transformers.<br />
** No. of telecommands required for fault locator as per C1.6.<strong>12</strong>.5 is to be<br />
added where applicable as the same has not been included.
B. Telesignals<br />
For details of telesignals actually required, clause 5.5.1 may by refered to.<br />
C. Telemetered parameters<br />
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -<br />
DESCRIPTION TSS SP SSP ATP<br />
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -<br />
1. 25 kV Bus/OHE voltage 2 2 - -<br />
2. Feeder current 2 - - -<br />
Spares 4 2 - -<br />
- 46 -<br />
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -<br />
Total: 8*** 4*** - -<br />
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -<br />
*** Telemetered parameters required for fault locator have not been included in<br />
the above table. The same are received from fault locator in digital form.
- 47 -<br />
ANNEXURE-2<br />
SCHEDULE OF GURANTEED PER<strong>FOR</strong>MANCE DATA, TECHNICAL DATA,<br />
TECHNICAL AND OTHER PARTICULARS<br />
1. Maker‘s name and country of origin.<br />
2. Manufacturer‘s type destination.<br />
3. Details of mini/micro-computers at RCC<br />
i) Make & type<br />
ii) Power supply required for operation.<br />
iii) Permissible variation in power supply voltage and frequency<br />
iv) Main semi-conductor RAM memory size<br />
v) Other detailed particulars along with technical pamphlets.<br />
4. Name of equipment for which 100% standby is provided at RCC.<br />
5. Arrangement of changeover from on line to standby system<br />
(manual/automatic, electronic, electrical).<br />
6. Hard disk memory capacity of each computer system (main/standby).<br />
7. Hard disk memory capacity of each computer system (main/standby).<br />
8. Colour VDUs<br />
i) Make & type<br />
ii) Size of screen<br />
iii) Whether fully graphic or semi-graphic<br />
iv) Number of background and foreground colours<br />
v) Does it conform to clause-6.1.2.2.?<br />
vi) Other detailed particulars along with technical pamphlets.<br />
9. Key-boards for VDUs<br />
i) Make & type<br />
ii) Whether functional keys and alpha-numeric keys are provided on<br />
separate keyboards or integrated in one ?.<br />
iii) Other detailed particulars along with technical pamphlets.
10. Data-logging printers<br />
i) Make & type<br />
ii) Speed in characters per second<br />
iii) Number of characters per line<br />
iv) Power supply required for operation<br />
v) Other detailed particulars along with technical pamphlets.<br />
11. Mimic diagram board<br />
- 48 -<br />
i) Indication LEDs/magnetic semaphore indicators for circuit<br />
breaker/interruptor/motor operated isolator-type, voltage rating and<br />
wattage.<br />
ii) Hooter voltage rating and wattage<br />
iii) Annunciation window LEDs-voltage rating and wattage.<br />
iv) Does it conform to clause-6.1.3?<br />
<strong>12</strong>. UPS at RCC<br />
i) Makes & type<br />
ii) Ratings<br />
iii) Input power supply<br />
iv) Permissible variation in input power supply voltage and frequency.<br />
v) Inverter output voltage and frequency<br />
vi) Variation in inverter output voltage from no-load to full load<br />
vii) Permissible variation in battery voltage for satisfactory operation<br />
of inverter<br />
viii) Rectifier ratings<br />
ix) Inverter ratings<br />
x) Efficiency of rectifier at rated output<br />
xi) Efficiency of inverter at rated output<br />
xii) Does it conform to clause-6.1.5?<br />
xiii) Is automatic changeover switch provided as per clause-6.1.5.?<br />
xiv) Acoustic noise level<br />
xv) Are equipment earthling terminals provided as per relevant<br />
standards?<br />
xvi) Maximum temperature inside the cabinet of the UPS, under normal<br />
working conditions.<br />
xvii) Other detailed particulars along with technical pamphlets.<br />
13. Battery for UPS<br />
i) Make & type
- 49 -<br />
ii) Battery voltage and ampere-hour capacity<br />
iii) Is the battery rated to provide 2 hours standby, in case of input a.c.<br />
supply failure to the UPS?<br />
14. Load at nominal inverter output voltage<br />
i) Load at nominal inverter output voltage.<br />
ii) Load on battery in case of input a.c. supply failure to the UPS.<br />
15. Software details<br />
i) Operating system used at RCC<br />
ii) High level language compliers provided in the system at RCC.<br />
iii) Does the software meet the requirement of clause-6.1.4 ?<br />
iv) Is the communication protocol with complete details enclosed?<br />
v) Hamming distance of the error checking system used for detecting<br />
errors in transmission.<br />
vi) Are the SCADA software and operating system details enclosed?<br />
vii) Are the limit settings of measurands selectable through software as<br />
per clause 6.2.4.2 ?<br />
16. Cyclic update time for updating of designed capacity of statue, alarm and<br />
measurand for:<br />
i) Total number of RTUs to be commissioned initially.<br />
ii) Total number of RTUs as per designed capacity.<br />
iii) Are calculations for the update time enclosed?<br />
17. Maximum time taken for execution of any control command including<br />
confirmation of back indication.<br />
18. Modems<br />
i) Make & type<br />
ii) Operating speed range (in bauds)<br />
iii) Actual transmission speed from master station to RTUs and carrier<br />
frequency adopted.<br />
iv) Actual transmission speed from RTUs to master station and carrier<br />
frequency adopted.<br />
v) Half duplex/full duplex<br />
vi) Type of modulation
- 50 -<br />
vii) Output signal level on send side:<br />
Nominal ……….<br />
Maximum ……….<br />
Minimum ……….<br />
viii) Threshold values of input signal on receive side<br />
Maximum ……….<br />
Minimum ……….<br />
ix) Dynamic range<br />
x) Maximum gain provided in the amplifier<br />
xi) Indications provided for fault diagnostics<br />
xii) Are the modems and the transmission speed suitable for the<br />
communication mediums specified in clause 5.8, 5.9 & 5.10 ?<br />
19. Power Supply for RTUs<br />
i) Power supply required for operation of RTU<br />
ii) Permissible variation in power supply voltage and frequency<br />
iii) Is the RTU designed for Operating from both ac & dc supply, as<br />
per clause-6.2.3 ?<br />
iv) Load of the RTU for designed capacity of parameters as per clause<br />
6.2.3 at 240V ac single phase vis-a-vis 110V d.c :<br />
- At TSS<br />
- At SP<br />
- At SSP<br />
- At ATP<br />
240V a.c. 110V d.c.<br />
20. Are events and alarm stored in the RTU, as per Clause-6.2.2 ?<br />
21. Do the RTUs meet the requirements of Clause-6.2 ?<br />
22. Catenary voltage indication circuits in RTU<br />
i) Voltage at which the catenary voltage indication circuit work.<br />
ii) Pick up voltage of the circuit ( please indicate range)<br />
iii) Drop off voltage of the circuit ( please indicate range)<br />
23. Catenary under voltage circuit in the ETU at SP<br />
i) Voltage at which the catenary under voltage circuit at sectioning and<br />
paralleling post (SP) works.
- 51 -<br />
ii) Limits (field settable) within which the catenary under voltage<br />
circuit can be set to trip the bridging interruptor.<br />
24. PT fuse fail circuits in the RTU at TSS<br />
i) Voltage at which the PT fuse fail circuit works.<br />
ii) Minimum pick up voltage of the circuit<br />
iii) Drop off voltage of the circuit.<br />
25. Interposing contactors/relays in the RTUs<br />
a) Telecommands<br />
b) Alarms<br />
i) On command<br />
ii) Off command<br />
iii) On status<br />
iv) Off status<br />
Type & make Operating voltage Current carrying<br />
capacity of<br />
contacts.<br />
i) Alarm relays ( Suitable for 110 v d. c. operation)<br />
26. Range of setting provided in the solid state comparator circuit in the RTU<br />
for 110V d.c. low indication.<br />
27. Are the telesignals at the controlled stations monitored as per clause 5.5.3. ?<br />
28. Furnish details of the no-volt relays used for ―ac fall‖ and ―PT fues fail‖<br />
indications.<br />
29. Details of transducers<br />
a) Voltage transducers<br />
i) Make and type<br />
ii) Range<br />
iii) Input<br />
iv) Output
v) Characteristics<br />
vi) Response time<br />
vii) Accuracy<br />
viii) Burden in VA<br />
ix) Self powered/auxiliary powered<br />
b) Current transducers<br />
i) Make and type<br />
ii) Range<br />
iii) Input<br />
iv) Output<br />
v) Characteristics<br />
vi) Response time<br />
vii) Accuracy<br />
viii) Burden in VA<br />
ix) Self powered/auxiliary powered<br />
30. Are the special requirement of the SCADA equipment specified in clause<br />
6.<strong>12</strong>, met with?<br />
31. Time taken to complete inter-tripping process from the instance of operation<br />
of W. P. C. relay at TSS.<br />
32. Equipment capacity at the RCC<br />
a) Maximum number of controlled stations,<br />
telecommands, telesignals and measurands that<br />
can be accommodated in the system offered<br />
i) Controlled stations<br />
ii) Telecommands<br />
iii) Telesignals<br />
iv) Measurands<br />
b) Number of controlled stations for which the<br />
equipment offered is complete in all respects and<br />
which are to be commissioned initioally:<br />
i) TSS<br />
ii) SP<br />
iii) SSP<br />
iv) ATP<br />
- 52 -
c) Number of controlled stations that can be added<br />
in figure by simply adding functional modules in<br />
the mimic driver for states/alarm out puts and<br />
incorporating, necessary changes in the software<br />
and the HDD, without effecting the existing<br />
system either physically or operationally.<br />
d) Number of telecommands, telesigmnals and<br />
measurands per controlled station for which the<br />
equipment is complete in all respects including<br />
functional modules.<br />
i) Telecommand<br />
ii) Telesignals<br />
iii) Measurands<br />
33. Equipment capacity at the RTUs<br />
a) Number of telecommands, telesignals and<br />
measurands, per controlled station for which the<br />
equipment has been designed, engineeredand<br />
wired up except for end stage interposing relays<br />
and transducers.<br />
i) Telecommands<br />
ii) Telesignals<br />
iii) Measurands<br />
b) Number of telecommands, telesignals and<br />
measurands per controlled station for which the<br />
equipment is complete in all respects including<br />
end stage interposing relays, tranducers andeither<br />
items.<br />
- 53 -<br />
TSS SP SSP ATP<br />
TSS SP SSP ATP<br />
TSS SP SSP ATP
i) Telecommands<br />
ii) Telesignals<br />
iii) Measurands<br />
34. Number of devices / alarms / measurands controlled by each module is<br />
RTU.<br />
i) Control and status module<br />
ii) Alarm module<br />
iii) Analogue module<br />
35. Number of devices / alarms controlled by each module in this mimic<br />
driver at RCC.<br />
i) Status module<br />
ii) Alarm module<br />
36. Are all the equipment used in the SCADA system of industrial grade, as<br />
per Clause 6.9.13?<br />
37. Diagnostic kit<br />
i) Make and Type<br />
ii) Give detailed particulars<br />
iii) Does the kit conform to clause 7.1(ii) ?<br />
38. Oscilloscope<br />
39. Multimeter<br />
i) Make and type<br />
ii) Other detailed particulars along with technical pamphlets.<br />
i) Make and type<br />
ii) Other detailed particulars along with technical pamphlets.<br />
- 54 -
40. Level meters ( dB Meter)<br />
i) Make and type<br />
ii) Other detailed particulars along with technical pamphlets.<br />
41. Dimensions<br />
Overall dimensions of –<br />
i) Mimic panel.<br />
ii) Equipment cabinate at remote control centers.<br />
iii) Equipment cabinate at controlled stations:<br />
a) TSS<br />
b) SP<br />
c) SSP<br />
d) ATP<br />
42. Are the enclosures, specified in clause- 14.3. enclosed along with the<br />
offer?<br />
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ANUEXURE= 3<br />
SALIENT FEAATURES OF 25KV CURRENT AND POTENTIAL<br />
TRANS<strong>FOR</strong>MERS<br />
A) Current Transformers<br />
i) Type Low reactance, single phase, oil filled,<br />
ii) a) National system voltage 27 kV<br />
b) highest equipment voltage 52 kV<br />
iii) Frequency 50 Hz<br />
iv) Rated primary current 1000/500 A<br />
v) Rated secondary current 5 A.<br />
vi) Rated transformation ratio 1000-500/5<br />
vii) Rated burden 60 VA<br />
viii)Accuracy class 5P<br />
self-cooled scaled outdoor types.
ix) Rated accuracy limit factor 15<br />
x) Rated short-time thermal current 25 kA (r.m.s.) for 1sec.<br />
xi) Rated dynamic current 62.5 kA (peck)<br />
B) Potential transformers, Type III<br />
i) Type Oil- immersed, self-cooled, core / shell<br />
type, suitable for outdoor use.<br />
ii) Rated system voltage 25kV nominal subject to variation from 19 kV<br />
. to 30 kV.<br />
iii) Frequency 50 Hz<br />
iv) type of connection Between Phase and earth<br />
c) Potential Transformers, Type-III ( Cont.)<br />
v) Rated primary voltage 27.5 kV<br />
vi) Rated secondary voltage 110 VA<br />
vii) Rated burden 100 VA<br />
viii) Class of insulation ‗A‘ class<br />
ix) Rated voltage factor 1.1 (Continuous)<br />
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SS -TRACTION SUBSTAION.<br />
TP -AUTO TRANS<strong>FOR</strong>MER POST.<br />
SP SUB-SECTIONING AND PARALLELING POST.<br />
P -SECTIONING POST.<br />
B -CIRCUIT BREAKER.<br />
-RY1, P-RY2 -CONTACTS OF PROTECTIVE RELAYS <strong>FOR</strong> CIRCUIT-<br />
-RY-3 BREAKERS CB1, CB2, CB3 RESPECTIVELY.<br />
-FAULT LOCATOR.<br />
DM -MODEM.<br />
TU -REMOTE TERMINAL UNIT.<br />
-ST1, CST2, -CALL-START TELE COMMAND <strong>FOR</strong> CB-1, CB-2, AND<br />
-ST3 CB-3 RESPECTIVELY,<br />
ED -N/O CONTACT OF RTU <strong>FOR</strong> FEED EXTENDING<br />
PURPOSE. [THIS CONTACT SHALL REMAIN OPEN IN<br />
<strong>NO</strong>RMAL FEED CONDITION AND REMAIN CLOSED<br />
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IN EXTENDED FEED CONDITION]<br />
-INT -DATA INTERFACE<br />
Note:-<br />
In case of underground telecommunication trunk cable, no modems (MDM)<br />
are required. The fault locators from TSS to SP shall be directly connected through one<br />
pair (two wire) of metal conductors of the trunk cable. No isolating transformer shall be<br />
provided in the trunk cable.<br />
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