SPECICATION NO. ETI/PSI/144 (12/91) SPECIFICATION FOR ... - rdso

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- 24 - (ii) 8 hourly printouts giving summary of all important events that occurred during the immediately proceeding 8 hours. It shall be possible to alter the format of such printouts from time to time based on changed requirements. Events that occurred during the periods when the datalogger is printing ‗periodic‘ or ‗on-demand‘ reports shall not be lost but printed out thereafter with their time of occurrence stamp. 6.2 Remote Terminal Unit (RTU) 6.2.1 Hardware The RTU shall be microprocessor based. It shall include its associated digital input/output modules, alarm input modules, analogue Input modules, watchdog transducers, memory, modems, interposing contactors, summation current transformers, power supply unit(s) and surge arresters and other items necessary for its proper functioning. A suitably designed circuit for giving initialization pulse to the CPU at predefined interval of time, which itself shall be user selectable, shall also be provided in the RTU, so that the CPU gets initialized automatically in case it halts due to any reason. 6.2.2 Reporting of events and alarms (i) All the changes (one or more) in the status of the circuit breakers* interruptors/motor-operated isolators and alarms that may occur between consecutive pollings shall be stored by the RTU until the are reported to the master station along with their time of occurrence. In other words, no event shall be lost without being reported to the master station. This feature is essential in view of the fact that the normal polling may get suspended due to failure of communication channel or other reasons. (ii) The storage capacity, in terms of number of events and alarms that the RTU can store, shall be clearly indicated in the offer. 6.2.3 Power Supply Units 6.2.3.1 The RTU shall normally operate off 240 V a.c., 50 Hz, single phase supply from the auxiliary transformer provided at the controlled station. This voltage may vary from 180V to 265V due to variation in the catenary voltage(25kV). In case of failure of a.c. supply, the RTU shall operate off the 110V battery. The load of the RTU shall be as low as possible and in any case shall not exceed 1 Amp at 110V d.c. power supply units required for conversion from the ac/dc supply to any other internally required voltages shall form part of the RTU.
- 25 - 6.2.3.2 The ac supply will have voltage surges and spikes due to the switching ON/OFF of the traction loads. Hence the power supply units shall include suitable surge suppressors to effectively suppress the voltage surges, spikes and the electrical noise in the incoming a.c. supply. 6.2.4 Parameters to telemetered/computed (measurands) 6.2.4.1 The RTUs shall be designed to telemetere two feeder currents and two OHE voltages from each TSS, and two OHE voltages from each SP. The arrangement for telemetry shall be as under: (a) From TSS i) Feeder currents: Two current transducers shall be provided, one each for either side of the TSS, taking reference from the two feeder CTs of that side through a summation CT. The summation CTs shall form part of the RTU. ii) Feeder voltages: Two voltage transducers shall be provided, one each for either side of the TSS, taking reference from the two OHE PTs of that side through a suitable change-over device. In the event of supply failure in any of the PTs, The change-over device shall automatically connect the live PT to the transducer. The change-over devices shall form part of the RTU. b) From SP Voltage of the OHE on either side: Two voltage transducers shall be provided, taking reference either from the UP or DOWN line PT through a suitable change-over device which shall form part of the RTU. 6.2.5 Transducers 6.2.5.1 Transducers provided at the controlled stations (TTS and SP) shall be Auxiliary-powered and of quick response type with a response time not greater than 1 second. They shall have linear characteristic over the entire range with accuracy of +/- 0.5%. Transducers shall give an output proportional to the input from current transformers and potential transformers at the TSS and at the SP as the case may be. 6.2.5.2 The salient features of CTs and PTs provided at the TTS. SSPs, SPs are at Annuxure-3.
Page 1 and 2: SPECIFICATION FOR SPECICATION NO. E
Page 3 and 4: 2.3 Atmospheric Conditions Maximum
Page 5 and 6: phases of the 220 or 132kV, three p
Page 7 and 8: main control and relay panel, 240V
Page 9 and 10: indicated by operation of Buchholz
Page 11 and 12: - 11 - ―PT fuse fail‖ indicatio
Page 13 and 14: - 13 - 5.8.8. The Railways will tap
Page 15 and 16: - 15 - (ii) There shall be two data
Page 17 and 18: 6.1.3. Mimic diagram board (MDB) -
Page 19 and 20: equipments status including manuall
Page 21 and 22: shall confirm in the offer that the
Page 23: 6.1.6 Data-logging printers - 23 -
Page 27 and 28: 6.4 Equipment capacity - 27 - 6.4.1
Page 29 and 30: - 29 - 6.5.2 Whenever the number of
Page 31 and 32: - 31 - channels and other such aids
Page 33 and 34: e so engineered that they are clear
Page 35 and 36: 6.12.4.4 The system shall also take
Page 37 and 38: where, Ln, Ln+l = kilometerage of t
Page 39 and 40: 7.2 The required quantity of instru
Page 41 and 42: - 41 - 11.4 Only after clear writte
Page 43 and 44: - 43 - c) Detailed step by step pro
Page 45 and 46: - 45 - ANNEXURE-I TYPICAL REQUIREME
Page 47 and 48: - 47 - ANNEXURE-2 SCHEDULE OF GURAN
Page 49 and 50: - 49 - ii) Battery voltage and ampe
Page 51 and 52: - 51 - ii) Limits (field settable)
Page 53 and 54: c) Number of controlled stations th
Page 55 and 56: 40. Level meters ( dB Meter) i) Mak
Page 57 and 58: ix) Rated accuracy limit factor 15
Page 59 and 60: - 59 -
Page 61 and 62: SS -TRACTION SUBSTAION. TP -AUTO TR
Page 63: - 63 -

SPECICATION NO. ETI/PSI/144 (12/91) SPECIFICATION FOR ... - rdso

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