remote control equipment - Indian Railways Institute of Electrical ...

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7.2.6.3 Remote to master data transfer All remote to master data transfer is accomplished with one basic message sequence by using variations in the field definations to accommodate different types of data. The basic seqence is shown below :- Notes :- FUNCTION CODE MASTER-TO-REMOTE DATA REQUEST MESSAGE REMOTE - TO - MASTER DATA MESSAGE 133 DATA IDENTIFICATION DATA UNIT 1 DATA UNIT 2 DATA UNIT 1. Message establishment and message termination fields are shown. 2. Function code specifies the types of data to be transferred by the RTU. 3. Data identification identifies the amount and type of requrested by the master station. On each message transmitted by the RTU (except for message containing only current data) it is necessary to retain the transmitted message in a RTU buffer, so that if the master station does not receive the message correctly, it can request a retransmission. Otherwise this information would be lost.
7.3 SCADA EQUIPMENT 7.3.1 General The SCADA equipment at the RCC is called Master Station while that of the controlled station is referred to as Remote Terminal Unit (RTU). 7.3.2 Transmission Path Underground telecommunication trunk cable is provided for transmitting the signals from and to the RCC and the controlled Remote Terminla Units (RTU). Three pairs of conductors (One pair for “Send”, one pair for “receive” and the third as spare) from this cables are made available for remote control operation. These days optical fibre cables are used in most of the divisions instead of above mentioned copper cables. Sometimes, microwave communications is used. 7.3.3 Isolating Transformers To limit the build up of longitudinal induced voltage on account of induction effects of 25 kV traction, isolating transformers are provided on the cable circuit at intervals of 10 to 15 km. The cable is tapped at the RCC and each controlled station and 3 pairs of conductors are terminated on a terminal board. Isolating transformer of impedance ratio 1120 : 1120 is provided at the point of tapping. 7.3.4 Repeater Stations Voice frequency repeaters are provided at intervals of 40 50 km to boost the signal and make good the been attenuation. The amplifier gain at the repeater station is about 20 dB. with an equilser incorporated to compensate upto 0.02 dB/kHz/km Depending upon the distance the repeater gain is state that the signal level at any point enroute is within cenrtain prescribed limits. It the lead is long suitable surge arrestors are provided inside the equipment room to ---- the ---- . The metalic sheath of the lead in cable shall also be kept insulated from the earth system of the switching station to prevent induction effect. the insulated conductor alone being led into control panels for the same reason switching station earthing. LT 240 V auxihary transformer neutral earthing and earth of R C equipment are all kept separate and distinct and are NOT interconnected In addition the switching station structure should be solidiy bonded to the track rails by two independent connections. 7.3.5 Microwave Communication In some of the sections on Indian Railways didicated Microwave channel at carner frequency of 18 GHz has been provided for the purpose of communication. 7.3.6 Optical Fibre Cable Optical fibre cable has also been introduced for communication in some sections of Indian Railways which is also used for RC equipment Details of the interface between the latest communication systems and the RCC/RTU equipment may be seen in the relevant technical documents. 7.3.7 Master Station Equipment Hardware Configuration: Dual main micro-computer/mini-computer system. one main and the other hot standby. is provided at the master-station. each system interfaces whtih its front end processors. If any. and modem for communication with RTUs and with the man-machine interface equipment to provied up-to-date network data and to accept commands. Each system has its own 134
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PREFACE The book on "Power Supply I
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However transformers of capacity 13
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3. To keep the unbalance on the 3 p
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1.2 POWER SUPPLY FOR SIGNALLING 1.2
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locomotives and Electric Multiple U
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2.0 Supply System 2. POWER SUPPLY F
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figures. This charge should be real
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2.4 Scrutiny of Bills have a bearin
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c) Procedure to be followed in case
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In the territorial setup one Subord
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3.2.3 Over load Capacity of Tractio
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B. Insulation resistance will conti
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3.3. GUIDING NOTES ON MAINTENANCE 3
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f) Fully push home the wedges betwe
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eakers/interrupters should also be
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A detail history of every battery s
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light or bluish grey according to a
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(e) Overhaul, bench tests and calib
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3.5. FORTNIGHTLY MAINTENANCE 3.5.1.
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obstruction and also if the shock a
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2. Test a sample of oil for BDV. 3.
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3. Check if the terminations of the
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Fortnightly Schedule: a) Drain wate
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d) Measure the IR between auxiliary
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TRACTION DISTRIBUTION SCHEDULE OF M
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3.0 Inspection of Traction Sub-stat
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4.0 Switching Stations a) Switch Ya
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SI. No . APPLICATION AND INTERPRETA
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2.2 Oxidation Carbondioxide is the
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3.4 Pattern of generation of gases
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TABLE - I SOLUBILITY OF DIFFERENT G
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TABLE V ROGER'S METHOD OF DIAGNOSIS
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1.1 Schedules MAINTENANCE OF SF6 CI
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Point / Location Tripping Mechanism
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1.0 General Annexure 3.05 MAINTENAC
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1.5 Detailed Check Checking shall b
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DESIGN ASPECTS OF TRACTION SUBSTATI
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• Characteristics of the locomoti
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considerations enlisted in para 4.0
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xii) Load losses 135.0 kW xiii) Cur
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item Nominal System Voltage 66kV 11
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Page 87 and 88: i) Three post, centre post rotating
Page 89 and 90: etween live parts and different pot
Page 91 and 92: 4.11.5 Design of grounding system 4
Page 93 and 94: 4.12.2 BIL of various equipments us
Page 95 and 96: (d) High speed inter tripping relay
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Page 99 and 100: SULFUR HEXAFLUORIDE(SF6) GAS 96 ANN
Page 101 and 102: 5.0 POWER SUPPLY SYSTEM PROTECTION
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Page 105 and 106: fault relay (132KV&25KV side) 4. ID
Page 107 and 108: will be supplied to the successful
Page 109 and 110: detected by normal distance protect
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Page 125 and 126: Just as the requirements of supervi
Page 127 and 128: The use of hermetically sealed comp
Page 129 and 130: The configuration used in Railway S
Page 131 and 132: This may be accomplished by several
Page 133 and 134: A typical example of commonly used
Page 135: 7.2.6.2The above sequence of messag
Page 139 and 140: 7.3.10 SCADA Software The operating
Page 141 and 142: systems are different, the basic fe
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Page 145 and 146: To combat interference, co-ordinate
Page 147 and 148: e = Er / R were introduced in the v
Page 149 and 150: It is seen that even if the lines a
Page 151 and 152: Fig. 8.3 Fig. 8.3 contains a family
Page 153 and 154: Typical Rail Current Distribution F
Page 155 and 156: 8.8 SUPPRESSION OF INTERFERENCE AT
Page 157 and 158: Magnetizing current is required to
Page 159 and 160: REGULATION FOR ELECTRICAL CROSSING
Page 161 and 162: Kc is cable screening factor and it
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