SPECICATION NO. ETI/PSI/144 (12/91)

SPECIFICATION

FOR

SUPERVISORY CONTROL AND DATA ACQUITION (SCADA)

SYSTEM FOR 2x25 kV A.T TRACTION

POWER SUPPLY

TRACTION INSTALLATION DIRECTORATE

RESEARCH DESIGNS AND STANDARDS ORGANISATION

MINISTRY OF RAILWAYS

GOVERNMENT OF INDIA

MANAK NAGAR, LUCKNOW – 226011

INDIA

Specification No. : ETI/PSI/144 (12/91)

SUPERVISORY CONTROL AND DATA ACQUISITION (SCADA) SYSTEM FOR

2x25 kV A.T. TRACTION POWER SUPPLY

1.0 Scope

1.1 This specification applies to the design, manufacture, supply, erection,

testing and commissioning of SCADA system to enable the Traction Power

Controller(TPC) or operator, to control from a central place called Remote Control Centre

(RCC), the switching operations of the equipments at traction sub-stations and switching

stations (hereinafter called "controlled stations"), to monitor the status of the equipments

and to collect and store information and data relating to the overall traction power supply

to the 2X25 kV overhead traction lines.

1.2 The SCADA equipment shall be based on the state-of-the-art technology.

The equipment at RCC, here after called as master station equipment, shall include dual

main mini-computer(s) system with sufficient semi-conductor RAM main memory, high

speed computer to computer communication link, system consoles, man-machine

interfaces through color VDUs and key-boards, front-end processors, modems, data

logging printers, watch dogs, floppy disks and hard disks along with their drives, switch-

over unit for switching over from main to standby computer or vice-versa, mimic driver

and mimic diagram board (MDB), UPSs with battery, console desks and surge arresters.

1.2.1 As an alternative to the master station built around minicomputers, tenderer

shall also quote for a master station built around dual main micro-computers.

1.3 The SCADA equipment at controlled station, hereafter called as Remote

Terminal Unit (RTU), shall be micro-processor based and shall be compatib1e with the

master station equipment• It shall be complete in all respects including central processing

unit with watch dog, digital input/output modules, alarm input modules, analogue input

modules, transducers, memory, interposing relays, summation current transformers, power

supply units, surge arresters and modem.

1.4 The SCADA equipment at RCC and at controlled stations shall be complete

with all units, parts and accessories necessary for their efficient operation and all such

units, parts and accessories shall be deemed to be within the scope of this specification

whether specifically mentioned or not.

2.0 Service conditions

2.1 The SCADA equipment may be installed any where in India. The

equipment at RCC shall be installed indoors. Air-conditioning may be provided, if

convenient, or else filtered air will be blown through to cool the equipments.

2.2 The SCADA equipment at controlled stations shall be installed inside track side cubicles and subjected to vibrations on account of running trains on the near-by railway tracks. These cubicles will not be air-conditioned and are liable to exposure to polluted atmosphere.

2.3 Atmospheric Conditions

Maximum average ambient temperature Minimum ambient temperature Relative humidity

… 45 deg C … 0 deg C ... 100 %

The locations at which the equipment is to function shall be subjected to dust

storms in summer, and to heavy rains and lightning during monsoon.

2.4 The SCADA system is intended for use at altitude not exceeding 1000 metres.

2.5 Voltage and frequency

2.5.1 At RCC : 415 V, 3 phase 50 Hz supply from the State Electricity Board shall be made available by the Railways. The voltage may vary between +10% and -15%, while the frequency between +3% and -3% of the nominal values. The master station equipment shall be suitable for satisfactory operation throughout these variations.

2.5.2.1 240V, single phase 50 Hz a.c.supply from the auxiliary transformers provided at controlled stations shall be made available by the Railways. Due to variation in the catenary voltage(25kV). The single phase voltage may vary between 180 V and 265 V. The frequency may vary between +3% and -3% of the nominal value. The RTU equipment shall normally operate off this a.c. supply and be suitable for satisfactory operation throughout variations in voltage and frequency.

2.5.2.2 Operation (open/close) of circuit breakers, interruptors and other equipments is carried out at 110 V d.c. For this purpose necessary battery charger shall be provided by the railways.

2.5.2.3 In case of failure of a.c. supply at the controlled station, the RTU shall

automatically operate off the 110 V d.c. supply. The d.c. voltage may vary between +l0%

and -15% of the nominal value. The RTU shall be suitable for satisfactory operation

throughout this variation.

3.0 Governing specifications

3.1 The SCADA equipment and component thereof shall, unless otherwise

specified, conform generally to the latest editions of the Bureau of Indian Standards

specification mentioned below:

IS:590 Fixed paper dielectric capacitors.

IS:1554 PVC (Heavy duty) insulated electric cables.

IS:1652 Stationary cells and batteries, lead-acid type with plants positive plates.

IS:1765 Direct current Potentiometers.

- 4 -

IS:3700 Ratings and characteristics of semiconductors devices.

IS:3895 Monocrystalline semi-conductor rectifier cells and stacks.

IS:4007 Terminals for electronic equipment.

IS:5051 Relays for electronic and telecommunication equipment.

IS:5786 Fixed carbon resistors, general purpose, low power.

IS:8309 Compression type tubular terminal ends for Aluminium conductors of

insulated cables.

IS:9521 Metal clad base material for printed circuits for use in electronic and

telecommunication equipment.

IS:9638 Fixed polyester film dielectric capacitors for direct current.

IS:9891 Edge connectors for printed wiring board.

IS:10482 Connectors for printed wiring board.

3.2 The above specifications shall be applied in a manner altered amended or

supplemented by this specification and the latest Indian Electricity Rules wherever

applicable.

3.3 Any deviation from this specification proposed by the tendered,

calculated to improve upon the performance, utility and efficiency of the equipment, will

be given due consideration, provided full particulars of the deviation with justification

thereof are furnished. In such a case, the tendered shall quote according to this

specification and deviations, if, any, proposed by him shall be quoted as an alternative(s). 4.0 Description of the 2x25 kV A.T. system 4.1 The power for electric traction is supplied in a.c. 50 Hz, single phase through 2x25kV A.T. feeding system, which has a feeding voltage (2x25kV) from the traction sub-station (TSS) two times as high as the catenary voltage (25kV). This high voltage power supplied from the sub-station through catenary wire and feeder wire in stepped down to the catenary voltage by use of auto-transformer (ATs) installed about every 13 to 17 km along the track at auto transformer Post (ATP), Sub-sectioning, and Paralleling Post (SSP) and Sectioning, and Paralleling Post (SP) and then fed to the locomotives. In other words, both the catenary voltage and the feeder voltage are 25kV against the rail, although the sub-station feeding voltage between catenary and feeder wires is 50kV. Therefore, the catenary voltage is the same as that of the conventional 25kV system. Since the power is supplied in two times higher voltage, the 2x25kV AT system is suitable for a large power supply and it has the following advantages as compared with the conventional 25kV system.

(a) Less voltage drop in feeder circuit.

(b) Large spacing of traction substations.

(c) Less telecommunication interferences.

(d) Suitable for high speed operation.

The power is obtained from 220 or 132/2x25kV Scott-connected/single phase transformer provided at the sub-station, which are normally spaced between 70 to 100km apart. The primary windings of the transformers are connected to two or three

- 5 -

phases of the 220 or 132kV, three phase, effectively earthed transmission net work of the State Electricity Board, in case of a single phase transformer or in case of two single phase V-connected transformers/Scott connected transformer respectively. The Scott-connected transformer and V-connected single phase transformers are effective in reducing the voltage imbalance caused by the traction loads on the transmission net-work of the Electricity Board. One outer wide terminal of the secondary windings of traction transformer is connected to the catenary, the other outer side terminal being connected to the feeder. Two inner side terminals are, via series capacitors or directly, connected to each other, and their joint is solidly earthed and connected to the running rails. The load current from the sub-station flows through the catenary and returns to the sub-station through the feeder. Between two adjacent ATs, the load current fed from the catenary to the locomotive flows in the rail and is boosted up to the feeder through the neutral tape of the two ATs. Mid-way between two sub-stations, a SP is introduced. At the point of TSS and SP, a dead zone known as neutral section is provided in the OHE to avoid wrong phase coupling. The power to the catenary and feeder on each side of the TSS is fed by one feeder circuit breakers, even if there exist two breakers for one side. The two breakers are used as a stand-by for each other. For maintenance work and keeping the voltage drop within limits, one or more SSPs are introduced between the TSS and SP. On a double track section, a SSP normally has four sectioning interruptors and one paralleling interruptor, and a SP has two paralleling interruptors and two bridging circuit breakers. In case of fault on the OHE, the corresponding feeder circuit breaker of the sub-station trips and isolates it. A figure showing the principles of AT feeding system and a typical power supply diagram showing this general feeding arrangement at a traction sub-station and sections of the OHE are given in the sketch at Appendix-I. 4.2.1 Protection System at traction sub-station: Following relays are provided for the protection of traction sub-station transformers: (a) Differentials relay. (b) Over current relay on receiving side.

(c) Earth fault relay on receiving side. (d) Instantaneous over-current relay on receiving side. (e) Phase failure relay (to detect malfunction of feeder circuit breaker). (f) Auxiliary relays for transformer faults i.e. Buchholz, excessive winding and oil temperature strip and alarm, pressure relief device trip and alarm and low oil level alarm. (g) Over-current relay on 2x25 kV side as back-up to feeder protective relays.

4.2.2. Following relays are provided for the protection of OHE: (a) Distance relay (with a parallelogram protection characteristics)

- 6 -

(b) Delta-I type fault selective relay. (c) Instantaneous over-current relay (d) Under-voltage relay to avoid wrong phase coupling 4.3 Auto reclosing of feeder circuit breaker: A single shot auto-reclosing scheme for the feeder circuit breaker at traction sub-station has been adopted to facilitate reclosing of the breaker automatically once, after a pre-set time delay after tripping of the breaker on OHE fault. This feature will help in quick restoration of traction power supply to OHE if the fault is of a transient nature. 4.4 All traction substations and switching stations are normally unattended and off circuit tap changer of the transformer, circuit breakers, interruptors, and motor operated remotely from the RCC through the SCADA equipment. 4.5 The off circuit tapchanger of the transformer, circuit breakers, interruptors and motor operated isolators could also be operated locally as well as manually at the TSS, SP and SSP as the case may be. At the TSS, a local/remote changeover switch is provided on the control panel, as well as in the mechanism box of the circuit breaker, interruptor and motor operated isolator. No control panel exists for the interruptors /circuit breakers at the SP and SSP and therefore the local/remote changeover switch is provided on the mechanism box of the interruptor/circuit breaker. 5.0 General Information 5.1 Remote Control Centre 5.1.1 The building, provided by the Railways for housing the RCC, shall include the main control room, equipment room, UPS room,RC laboratory and battery room. The layout of the RCC and the equipments therein will be decided by the `Railways‘. 5.1.2. The RCC will be suitably illuminated, and the equipment room, control room and RC laboratory may be air-conditioned, if convenient, or else filtered air will be blown through to cool the equipments, by the Railways. The SCADA equipment shall be designed to give satisfactory Service without air-conditioned. 5.1.3. Necessary cable trenches will be provided by the Railways. 5.1.4. The computer furniture for operator workstation shall be supplied by the successful tenderer. It shall include:

(i) One table and one chair for each workstation. (ii) Two tables, one for each data logger, and (iii) One table and one chair for the Engineer‘s workstation. The furniture shall be procured from M/s Godrej or other reputed manufacturer as per the basic design enclosed a Appendix 2 to this specification. 5.2 Control room building at controlled station: 5.2.1. A control room building will be provided by the Railways at each TSS, having an equipment room and also a battery room. This equipment room will house the

- 7 -

main control and relay panel, 240V a.c. and 110V d.c. distribution board, 110V battery chargers, telephone apparatus as well as RTU(S). The battery room will house the 110V and telephone batteries. A Typical layout of the control room building is indicated in Drg. No.ETI/PSI/0238. Mod.B at Appendix.3. 5.2.2 A small masonary building will be provided by the Railways at each SP, SSP and ATP, having an equipment room and a battery room. The equipment room will house RTU, battery charger, terminal board, 240V a.c. distribution board and telephone apparatus. The battery room will house 110V and telephone batteries. A typical layout is indicated in Drg. No.ETI/PSI/0010, Mod.D Appendix 4. 5.2.3 The buildings at controlled stations are not air- conditioned. Suitable illumination inside the rooms shall be provided by the Railways. 5.3 Operation of circuit breakers, interruptors and motor operated isolators at controlled stations 5.3.1 The closing and tripping circuits of the circuit breakers, interruptors and motor-operated isolators are designed to operate off 110V battery supply, the batteries being provided by the Railways. 5.3.2 Interposing contractors, for operating the closing and tripping circuits from RCC shall form part of the SCADA equipment. The contractor shall be suitable for 110V d.c. supply varying from +10% to -15%. The contacts of contractors shall have a continuous current carrying capacity of 10A, making capacity of 20A and breaking capacity of 2A inductive load. The contacts are liable to damage due to breaking of inductive current in the trip/closing coil circuits and therefore an arrangement for spark quenching, if necessary, shall be provided. Besides, the interposing contractors shall be so designed that it remains energised for a period adjustable between 500ms and 2s, arrangement for which shall be provided on the control output card in the RTU. These measures are required to prevent damage to the contacts. 5.4 Monitoring of the state of catenary Outdoor type 27.5kV/110V, 100VA potential transformers are installed at the controlled stations by the Railways for monitoring the state of sub-sectors of the catenary i.c. Whether energized or not and for under-voltage relay operation at the SPs. The catenary voltage sensing shall be done through rectifier and solid-state comparator circuits so designed that the de-energised indication on the MDB/VDU appears at a voltage selectable between 50% and 70% and disappears between 60% and 80% of the rated voltage viz 110V a.c. 5.5 Telesignals and their monitoring 5.5.1 The various telesignale from typical TSS, SSP, SP and ATP in a double line section to the master station are as under: I. From each TSS (a) Name of telesignal

1. 110V d.c. low. 2. 240V a.c. fail. 3. Catenary-1 fail/feeder-1 P.T. fuse fail.* 4. Catenary-2 fail/feeder-1 P.T. fuse fail.* 5. Catenary-3 fail/feeder-2 P.T. fuse fail.* 6. Catenary-4 fail/feeder-2 P.T. fuse fail.*

- 8 -

7. 220/132/110/66kV transmission line circuit-1 P.T. fuse fail (wherever required).

8. 220/132/110/66kV transmission line circuit-2 P.T. fuse fail (wherever required).

* There is no separate telesignal for PT fuse fail indication. The annunciation for PT fuse fail indication shall be done in case of any inconsistency between the status of feeder circuit breaker/paralleling interruptor and the catenary indications. (Feeder circuit breaker/paralleling interruptor when under power block is to be treated as ‗open‘ for this purpose.)

(b) For each Scott-connected/single phase Traction Power Transformer, Auto transformer and associated switchgear (i) From transformer-1

*9. TR-1 Alarm. **10. TR-1 Fault ***11. TR-1 Trip circuit 110V dc fail 12. TR-1 220/132/110/60 LV circuit breaker ―Locked –out‖ due to low gas/air pressure.

13 TR-1 25kv CD-1 ―Locked out‖ due to low gas/air pressure 14-19 TR-1 tap 1 to 6 position

20 TR-1 Blower fans working 21 TR-1 25kV CB-2 ―Locked-out‖ due to low gas/air pressure

(In case of Scott-connected transformer only). * TR-1 Alarm: This has to come whenever any alarm viz. Buchholz Alarm, pressure relief device alarm, oil/winding temperature my high alarm and low oil level alarm occurs. ** TR-1 fault: This has to come whenever the inter-trip relay (which trips both HV and LV breakers of the transformer) operates. *** TR-1 trip-circuit fail: Whenever the 110V dc supply to the control circuits fails or any of the trip circuits of 220/132/110/66kV or 25kV transformer circuit breakers fails. Necessary auxiliary contacts of various relays/indicators suitably wired up and terminated on the control and relay board at traction sub-station shall be provided by the Railways. Suitable relays or circuits required in the RTU at TSS for the telesignal shall be provided by the successful tenderer.

(ii) From Transformer-2 22 to 34-as for TR-1 (iii) From Transformer-2(as required) 35 to 47-as for TR-1 (iv) From Auto Transformer-1 *48. AT-1 Alarm **49. AT-1 Fault

* AT-1 alarm: This has to come whenever any alarm viz. Suchholz alarm, pressure relief device alarm, oil/winding temperature high alarm and low oil level alarm occurs.

** AT-1 fault: This has to come whenever any fault in the transformer is

- 9 -

indicated by operation of Buchholz relay, pressure, relief device, winding temperature indicator and oil temperature indicator.

Necessary auxiliary contacts of various relays/indicators suitably wired up and terminated on the control and relay board/terminal board shall be provided by the Railways. Suitable relays or circuits required in the RTU for the telesignal shall be provided by the successful tenderer.

(v) From AT-2

50-51-as for AT-1

(vi) From AT-3

52-53-as for AT-1 5 From AT-4 54-55-as for AT-1

(c) Common telesignals for TR-1 to TR-3 and AT1 to AT4

56. 110V dc supply for alarm circuits fail. (d) For each feeder circuit breaker

(i) For feeder-1

57. Feeder CB-1 DPR operated. 58. Feeder CB-1 instantaneous OCR operated. 59. Feeder CB-1 Delta-I relay operated.

60. Feeder CB-1 ―Locked out‖ due to low gas/air pressure 61. Auto-recloser for CB-1 ―Locked-out‖. (ii) For feeder CB-2 62 to 66-as for feeder CB-1 (iii) For feeder CB-3 67 to 71-as for feeder CB-1 (iv) For feeder CB-4 72 to 76-as for feeder CB-1 (c) For shunt capacitor bank control (as required) (i) Bank-1

77. CB ―Lockedout‖ due to low gas/air pressure. 78. PT fuse fail 79. Shunt capacitor bank fail

(ii) Bank-2 80 to 82-as for bank-1 * The shunt capacitor bank may be provided with a potential free 11/0 contact

- 10 -

which closes in case of my internal fault(s) in the shunt capacitor bank.

II. From each SP

1. 110V dc low.. 2. 240V ac fail 3. Catenary-1 fail 4. Catenary-2 fail 5. Catenary-3 fail 6. Catebary-4 fail 7. AT-1 Alarm 8. AT-1 Fault 9. AT-2 Alarm 10. T-2 Fault 11. At-3 Alarm 12. AT-3 Fault 13. AT-4 Alarm 14. AT-4 Fault 15. CB.1 ―Locked out‖ due to low gas/air pressure. 16. CB.2 ―Locked out‖ due to low gas/air pressure.

For details of AT-1 to 4 Alarms and At-1 to 4 Faults, explanation given in clause No. 5.5.1.I.b (iv) may be seen.

III. From each SSP

1. 110V dc low 2. 240V ac fail 3. Catenary-1 fail (wherever required) 4. Catenary-2 fail (wherever required) 5. AT-1 Alarm 6. AT-1 Fault 7. AT-2 Alarm 8. AT-2 Fault

For details of AT-1 to 2 Alarms and At-1 to 2 Faults, explanation given in clause No. 5.5.1.I.b (iv) may be soon. IV. From each ATP

1. AT-1 Alarm 2. AT-1 Fault 3. AT-2 Alarm 4. AT-2 Fault 5. 240V ac fail 6. 110V dc low

For details of AT-1 to 2 Alarms and At-1 to 2 Faults, explanation given in clause No. 5.5.1.I.b (iv) may be seen. 5.5.2 The protective relays viz. OCR, DPR and delta-I relay reset themselves immediately after operation. 5.5.3 Amongst the above tele-signals, the monitoring of ―dc low‖ Indications shall be through solid-state comparator circuits, while that of ―a.c. fail‖ and

- 11 -

―PT fuse fail‖ indication through rectifier and no-volt relays, and that of ―catenary supply‖ indications through rectifier and solid-state comparator circuits. Monitoring of the balance indications shall be through 110V dc interposing relays. The rectifier, comparator circuits, no-volt relays and interposing relays shall form part of the RTUs. 5.6 Tap-changer control of traction power transformers 5.6.1 The traction power transformer at s TSS may be provided with motor operated off-circuit tap changer with 110V dc control circuit. For remote control of the tap-changer from the RCC, progression/regression telecommand shall be provided. The tap position shall be telesignalled to the RCC in confirmation of the telecommand. 5.6.2 The tap changer switch has six tap positions. For each tap position one NO type contact is provided. At any tap position, only the corresponding NO contact will remain closed and the remaining contacts will remain open. 5.6.3 Each telecommand for the tap changer shall include progression/regression telecommand and the back telesignal from the TSS of the tap position. 5.7 The terminal required for interfacing the controlled station with RTU at TSS shall be provided by the railways in the control and relay panel at TSS. The terminal at SP/SSP/ATP shall be provided on a terminal board mounted on the wall inside the masonry building at SP/SSP/ATP. The supply of cable and wiring between the control and relay panel/terminal board and RTU shall be done by the successful tendered. The cable shall conform to IS:1554. 5.8 Underground trunk cable 5.8.1 Underground telecommunication trunk cable is provided by the railway alongside the railway track. Three part of conductors (one pair for ―Send‖, one pair for ―Receive‖ and third pair as spare) from this cable shall be made available for remote control purposes. 5.8.2 The cable shall conform to railways specification No.TC-14/75. The salient technical particulars of the star quads Of the cable circuits made available for remote control operation are as under:

(a) Dia of copper conductor 0.9mm (b) Type of insulation Paper (c) Nominal loop resistance at 55.2 ohms/km 20 degree c.

(d) Resistance unbalance between Not more than 1% Two conductors of a pair of nominal loop. (e) Nominal mutual capacitance of 0.041 microfarad/km. The pairs of paper insulated VF quads (f) Capacitance unbalance after Balancing of full loading section of 1.83km.

(i) Between pairs (same quad) Less than 40pF

- 12 -

(ii) Between pairs (adjacent quads) Less than 40pF Quads)

(g) Characteristic impedance of 1120 ohms Paper insulated pairs at 300Hz when loaded

(h) Insulation resistance when Not less than 10,000 measured at 500V meg. Ohms/km

(i) Loading at intervals of 33 milli Henries 1.33km

(j) Attenuation at 800Hz 0.25dB/km when loaded

5.8.3 The characteristics of tapping, terminating and sectionalisting transformer for voice frequency circuits are as under:

(a) Impedance ratio 1120:1120+2%

(b) Insertion loss from 300Hz Less than 0.9 dB to 2500Hz (c) Bridging loss with secondary Less than 0.015dB open from 300Hz to 2500Hz (d) Attenuation distortion from Less than +0.1dB 300Hz to 2500Hz (e) Dielectric strength 2000V ac (rms) for 1 Minute

(f) Return loss in frequency More than 20 dB range of 300 Hz to 2500 Hz

5.8.4 Isolating transformers will be installed at every 10 to 20 kms by the railways

to limit the induced voltage.

5.8.5. Voice frequency repeaters will be provided by the Railways at intervals of

40 to 50 km to boost the signal level. The amplifier gain at the repeater station will be

about 20dB with an equaliser incorporated to compensate up to 0.02dB/kc/km. The

SCADA equipment shall, however, incorporate an amplifier having a minimum gain of

30 dB to compensate for any signal level variation at difficult points in the system.

5.8.6. The repeater section far and cross talk attenuation (equal level cross talk)

between any two voice frequency pairs at a frequency of 800Hz will be not less than

65dB and that at the near-end not less than 61dB.

5.8.7. The underground trunk cable being normally laid close to the railway track,

the lead from tapping transformers to the remote control or control building would be

small.

- 13 -

5.8.8. The Railways will tap the main underground cable and terminate three pairs

(including one spare pair) of conductors on a terminal board at the RCC and at each

controlled station. At the point of tapping from the main underground trunk cable,

isolating transformer with impedance ratio of 1120/1120 ohms will be provided by the

Railways. Any other matching transformers considered necessary for satisfactory

operation of the SCADA equipment shall be provided by the successful tenderer.

5.8.9. Surge arrestor assemblies for protection of remote control equipment against

induced voltage in the telecommunication cable shall be provided on all the 3 pairs of

conductors at RCC as wail as at all the controlled stations by the successful tenderer.

5.8.10 The tendcrer shall carefully study and understand the specifications of the

to1ecommunication cable and associated equipments given above end confirm that the

SCADA equipment offered shall work satisfactorily. Any additional equipment/

accessories in the cable circuits required to ensure satisfactory working shall be provided

by the successful tendered.

5.9 Microwave communication

In. some of the sections on Indian railways dedicated Micro wave channel at

carrier frequency of 18 Ghz has been provided for the purpose of communication.

5.10 Optical fibre cable

Optical fiber cab1e is now being introduced for communication in acc of the

sections on Indian Railways. The interface between the optical fiber cable and the RTUs

to be supplied by the manufacturer shall b3 provided by the railways, The salient

technical particulars of optical fiber cable and optical line terminating equipment are as

under:

(I.) Optical fibre cable

a) The cable consists of six/eight mode fibres.

b) Mono mode fibre: As poor CCIET recommendation

No.G652.

c) Optimised wave length 1300nm +/— 0.25nm.

band

d) Nominal mode-field 0 to 10 micrometer +/—10%.

Diameter

e) Nominal cladding diameter 125 microns +/— 2.4%.

- 14 -

f) Cut—off wave length 1120 to 1280 nm

g) Attenuation Less than 0.5 dB/m at

1300mm band measured at

the worst wave length.

h) Total dispersion Less han7.0ps/nm/Icn

(Fibre 0ptimised for 1300nm

band)

i) Splicing loss including Less than 0.15 dB/joint.

splicing protection.

(II) Optical Line terminating equipment

(i) Electrical interfaces:—

a) Line bit rate 2048 kB/s.

b) Line code : HDB-3

c) Line Impedance 75ohms unbalanced or 120 ohm balanced

CCITT. Rec. G703

(ii) Optical interfaces: LED for transmission & SI-APD reception

a) Line Bit Rate 2048 kB/s

b) Line code CMI (Coded mark Inversion)

c) Modulation Im (Intensity modulation)

6.0 GENERAL DESIGN FEATURE OF THE SCADA SYSTEM

6.1 Master Station Equipment

6.1.1 Hardware configuration

(i) There shall be dual main mini-computer(s) system, one main and

the other as hot standby, each system interfacing with its front and processor (s) and

modem (s) for communication with the RTU‘s and with the man machine interface

equipment to provide upto-date network data and to accept commands. Each system shall

have its own system console and hard and floppy disks along with their drives, and watch

dogs for monitoring the healthiness of the system.

- 15 -

(ii) There shall be two data-logging printers one on-line and the other as

standby. Both the printers shall be connected to the same on-line computer system. In

case of one printer, the other printer shall automatically take over.

(iii) In case of failure of one computer system, the switchover to the other

computer system shall be through an automatic switchover system. However, provision

for manual changeover between the computers shall be provided by the manufacturer.

6.1.2 Man Machine Interface

6.1.2.1 Workstations

6.1.2.1.1 There shall be two work-stations, one for each of two operators, each

consisting of two semigraphic colour VDU‘s and their keyboards. The keyboard shall

contain both functional keys for operations that are repeated frequently, and alpha-

numeric keys for inputting numerical data and text. The key-board shall be interactive

with the displays on the VDUs, which allows parameter changes and device control by

identification of the object to be addressed by device or position reference input or via the

function and alphanumeric keys, or by the positioning of a cursor. The interaction

between the operator and the computer to select displays, to between the operator and the

computer system to select displays, to give commands, and to input data for limits,

calculation parameters and other items shall be of a simple dialogue nature. Text, for

tagging or recording or sanctions. May be temporarily added to the displays when entered

via the keyboard.

6.1.2.1.2 Both the workstation shall be connected to the same online computer and

shall meet the following requirements:

(i) Each workstation shall normally control pre-defined, physically demarcated

sections.

(ii) In case of complete outage of one workstation, all its functions shall be

transferred to the healthy workstation so that normal operations continue.

(iii) Normally one VDU will be online and the other VDU as standby at each of

the workstations. However, if desired by the operator, it shall be possible to have online

both the VDUs for viewing station diagram for tele control purpose and the other VDU

for viewing alarms, on-demand trend curves, histograms and other data.

Note:- Two workstations as mentioned above are for controlling upto 30

RTUs. However, if the number of RTU‘s in the system are less than or equal to 15 then

only one workstation shall be provided. On the other hand, if the number of RTUs in the

system are more than 30, then for each 15(or less) additional RTUs one more workstation

shall be provided.

- 16 -

6.1.2.2.4 Modes of operation

The modes of operation shall include the supervisory mode, control mode,

edit mode and programming mode.

6.1.2.1.4. Security

To ensure a high degree of system security and to prevent unauthorized

operations, the following levels of access shall be provide.

(i) Operator‘s level

This level is for interaction of the TPC with the computer for his

day-to –day working.

(ii) Supervisory level

This level is meant only for getting information from the computer.

Control operation of electric switchgear shall not be this level.

(iii) Programmer‘s level

This level is for compilation purposes only.

(iv) Engineer‘s levels

This level shall have total access to all the programmers stored in

the system and shall normally be retained by the manufacturer till specifically asked for

the railways.

6.1.2.1.5 The operators‘ console desk and separate stand(s) for VDUs (if any) shall

form part of the SCADA equipment.

6.1.2.2 VDUs

The size of VDUs at the operator‘s work-stations shall be a minimum of

48cm (19‖) diagonally. It shall support 8 foreground and 8 background colours, have

high resolution and provide a 80 columns X32 rows display. The character set shall

include full standard ASCII characters and user-generated symbols, so as to generate

tabular displays and semi-graphic displays of the traction power supply system.

6.1.2.3 Engineer’s workstation

A separate plug-in Engineers‘ workstation shall be provided incorporating a

QWERTY key Board including special function keys and special characters and cursor

control keys. Engineers‘ workstation shall include a 35 cm (14‘,) 80 columns x 32 rows

monochrome VDU with a console capable of housing all equipments. The console shall

be so designed that its installation in the equipment room is conveniently possible

through plugs and sockets. Unauthorised use of key boards shall be prevented by use of a

key lock switch and by entry of a security code.

- 17 -

6.1.3. Mimic diagram board (MDB)

6.1.3.1 A mimic diagram board and its associated mimic driver shall be provided

at the RCC. The MDB shall depict the traction power supply diagram, indicating the

energised/ de-energised condition of sub-sectors of catenary, status of interruptors and

feeder circuit breakers at TSS & FP, SSP and SP.

6.1.3.2 Since all control operations are to be carried out from the key board (s)

provided at the workstation (s), the MDB‘s sole purpose is to give an overall view of the

traction power supply system to the operator. In view of this limited function, the overall

size of the MDB shall be restricted to 3500mm x 750mm x 200mm for depicting 30

controlled stations.

6.1.3.3 Annunciation for controlled stations

For each controlled station an annunciation ―Remote station defective‖

shall be provided on the MDB using an LED.

6.1.3.4 Annunciations for master station equipment

The following annunciations by LEDs shall be provided the MDB:

i) Main system ON

ii) Stand by system ON

iii) Main system defective

iv) Stand by system defective

v) Main UPS sail

vi) Stand by UPS fail

vii) UPS battery low: This shall show up when the UPS

battery voltage falls below 90% of the nominal voltage.

Necessary relays/circuits for this purpose shall form part

of the contract.

viii) 415 V 3-phase ac to UPS fail

6.1.3.5 Other facilities on the MDB

The following facilities shall be provided on the MDB:

- 18 -

i) Alarm indication pilot LED: A yellow alarm indication LED of

10mm diameter shall be provided for each remote station. The LED shall light up when

any alarm is received from the RTU.

ii) A LEDs test push button(s) shall be provided to test the healthiness

of LEDs on the MDB. Alternatively, the tender may carry out this function by software

programme to be initiated from the workstation.

6.1.3.6. No standby is required for the mimic drivers. Now ever, the arrangement

shall be such that failure of any module shall not affect more than one RTU display on

the MDB. However, there is no necessity to provide individual CPU for each controlled

station on the MDB. The renderer may offer a system in which one CPU designated as

―main‖ controls a maximum of ten stations along with its ―stand by ― CPU which shall

take over functions automatically in the event of failure of main CPU.

6.1.4 General requirements of Software

6.1.4.1 The operating system used shall be suitable for multi-user, multi-tasking,

networking and real time applications.

6.1.4.2 The software shall include compilers for high level languages viz.

FORTRAN, BASIC and COBOL.

6.1.4.3 The software shall support local area network facility.

6.1.4.4 SCADA software

6.1.4.4.1 The system shall be modular in structure and user friendly.

6.1.4.4.2 VDU displays

The software shall support the following VDU displays.

(i) Station diagrams:

(a) Semigraphic, coloured displays of any three adjacent controlled

stations shall be provided. The display shall include both fixed and variable data, namely

ON/OFF status of equipments, catenaries, alarms, measurands and names of the

controlled stations.

(b) Symbols: The symbols for various equipments shall be as per

international standard.

(c) The display shall permit transmission of telecommands to circuit

breakers, interruptors and other equipments, by simple key-board operations by the

operator. Facility for marking (manual input) shall be provided for any alarms,

- 19 -

equipments status including manually operated isolators, measurands and limit-settings,

by simple key-board operations by the operator.

(ii) Tabular displays: Tabular display of data of a controlled station

shall be provided. The data shall include equipment status, alarms and measurands.

(iii) Alarm list: Display of the alarm list in a chronological order

starting from any given time shall be provided. It shall include both current and historical

alarm list. The current alarm list shall have 400 entries.

(iv) Event list: Display of the event list, which includes commanded

and uncommanded changes in equipment status, starting from any given time shall be

provided. It shall include both current and historical event list. The current event list shall

have 400 entries.

(v) System clarms: The alarms generated by the SCADA equipment,

and not by the traction power supply system, shall be displayed here.

(vi) Trend diagrams: The time version value plot of upto four

measurands shall be displayed in a trend diagram. Each measurand shall be displayed in a

separate colour. The trending shall include both historical trending and dynamic trending

of the current data.

(viii) Histograms: For both current and historical data the time versus

value plot of any measurand by histogram shall be provided.

(viiii) Bargraphs: Display of the current values of upto four measurands

by bargraphs-each bar having a different colour-shall be provided.

(ix) Message pad: One page shall be provided for the operator to record

important messages.

Calling any of the VDU displays shall be by simple keyboard

operations by the operator. NEXT/PREVIOUS or PAGE UP/DOWN option shall be

made available.

6.1.4.4.3 Update, process and alarm inhibit, equipment and RTU block/deblock and

portability and upgradability feature

(i) The software for the SCADA equipment shall be designed to cater

for updating for adding or deleting controlled stations or individual parameters such as

telecommand, telesignal or measurand at any of the existing controlled stations. The

method employed to achieve this feature shall be clearly explained by the tenderer in his

offer. The system shall be supplied alongwith high level language compiler (s) to enable

- 20 -

an authorized person without any previous knowledge of programming language to carry

out the necessary amendments.

(ii) Facilities shall be provided for the operator, through simple

keyboard commands to:

-take out of scan and control (process inhibit) any alarm

point/control point/measured or a complete RTU.

-block/de-block a complete RTU as well as any control point

(circuit breaker, interruptor and other equipments at the controlled station) which

disables/enables control operations from the RCC. The blocked condition of any

equipment shall be suitably indicated on the VDU, for example by a change in colour of

the corresponding equipment display.

-inhibit any alarm point which shall discontinue processing of the

alarm point at the RCC.

(iii) The software shall be designed for maximum portability and

upgradability, so that it is generally machine independent and upgradable to meet with

the developments in the computer hardware/technology.

6.1.4.4.4 The software should support BROADCAST control, i.e. sequential

commands to a group of equipments like circuit breakers, interruptors.

6.1.4.4.5 Transmission and coding system

The master station equipment shall normally scan continuosly all the

RTUs in a pre-defined cyclic sequence, to update the equipment status, alarms, events

and measurands. Exchange of information between the master station and the RTUs shall

be on interrogation by the master followed by the reply from the RTU. The

communication technique shall be based on Digital Address Time Division Multiplexing.

Every data-exchange shall be based on a well defined transmission protocol based on

International Standard for data transmission. Each transmitted information shall contain

sufficient parity check bits so as to allow an effective error detection code to detect

different combination of transmission errors. The error checking system shall have a

minimum Hamming distance of four i.e. all three bit errors shall be detected one hundred

percent.

6.1.4.4.6 Communication pr optical

The communication protocol employed in the system, including transmission security

and computation of reliability factor, shall be clearly explained in the offer. The tenderer

- 21 -

shall confirm in the offer that the protocol employed will not allow false indications and

invalid transmissions.

6.1.4.4.7 Issue/cancellation of power Block

(i) Power block is generally given for maintenance of any equipment

like transformer, circuit breaker, interruptor, section of OHE or any other equipment by

de-energising the equipment/section of OHE. Provision shall be made for entering into

the computer necessary private numbers and messaged exchanged between the field staff

at site and the operator at RCC in connection with the requisition for issue/cancellation of

the power block and the time duration for which the power block is given. If a power

block is not cancelled at the end of the permitted duration, a message ―Power Block Time

exceeded‖ shall appear on the VDU along with the equipment/section reference and time,

with an audible alarm to attract the attention of the operator.

(ii) When an equipment is under power block, it shall not be possible

to operate that equipment unless the power block is first cancelled from the RCC. In

case the telecommand for operating that equipment is attempted, a message "Equipment

under power block" shall appear on the VDU.

6.1.4.4.8 Indication for complementary faults

The status of any bi-state device like circuit breaker, interruptor is

monitored through two auxiliary contacts of the device, the status (open/ close) of the two

contacts being normally complement(opposite) of each other, in the ON/ OFF condition

of the device. However, when both the auxiliary contacts are either in open or in closed

condition, such faults shall be detected and identified as complementary faults. The event

shall be logged and suitable indication shall appear on the MDB and VDU.

6.1.4.4.9. Alarm processing

(i) Any and every change in the state of telesignals, uncommended

change in the status of equipments like circuit breaker, interruptors, and limit violation of

telemetered parameters (measurands) shall he processed as alarms.

(ii) Each and every alarm shall attract the attention of the operator by

an audible hooter and by a change in this display of the equipment status or change in

colour of display of the telemetered parameter or change in colour of display of the alarm

(telesignals) point as applicable, and the display shall start blinking (flashing). Upon

acknowledgement by the operator, the audible, alarm shall cease and the display on VDU

become steady.

(iii) Each and every alarm that appears on any VDU display, operation.

- 22 -

6.1.4.4.10 Historical data storage

(a) The SCADA equipment at RCC shall be designed to cater for historical data

storage of the traction power supply system data for a period of one year. This shall

include:

(i) All alarms/events/measurands of the controlled stations and all

system alarms.

(ii) Day-wise storage of average feeder current and voltage during the

day, maximum demand, maximum and minimum feeder voltage, total number of

operations of feeder protective relays viz OCR, DPR and WPC relays, and maximum and

minimum OHE voltage at SP on both sides of the neutral section or phase break.

A memory capacity of 80 MB shall be provided for this purpose in the hard

disk. This required memory shall be capable of being expanded a required later. The

tendrer shall indicate the details for this feature in this offer.

(b) A facility shall be provided for accessing any data from the SCADA data-

base from any other remote computer terminal/ RCC or from a centralised computer

located at the zonal railway headquarters.

6.1.5 UPS and batteries at RCC

The tenderer shall quote for dual stand alone UPS systems of adequate

capacity for supplying stabilised 240V ac, 50 Hz, single phase supply to various

equipments of the SCADA system at master station. Input supply to the UPSs shall be at

415V ac, 50 Hz, 3 phase with a permissible variation between +10 and -15% for the

voltage and +3% and -3% for the frequency. Both the UPSs shall work in parallel to

share the load of the system. However, the capacity (VA rating) of each UPS shall be

designed to meet with the entire load of the system in the eventuality of the failure of the

other. The taking over the load by the healthy UPS shall be automatic without effecting

the normal working of the system. The failed UPS shall also disconnect it form the circuit

automatically. The UPSs shall provide for trickle/normal/boost/auto charging of the

battery in addition to supplying normal load to the various equipments. The UPS shall

conform to relevant international standard and be suitable for operation with computer-

based equipment. Alarm and mimic facilities shall be provided on the facia of the UPS

for ease of operation and maintenance. The acoustic noise level generated by UPS shall

be as low as possible and shall not be exceed 50 dB when working alone.

A single set of storage battery of Nickel-Cadmium type shall be provided with

both the UPSs. The battery shall have adequate Ah capacity to provide two hours of

supply to various equipments in case of failure of input 415V a.c. supply.

- 23 -

6.1.6 Data-logging printers

6.1.6.1 Two alphanumeric dot-matrix printers with a printing speed or 189

characters per second shall be provided. The printer shall have 132 columns with facility

for friction roller and tractor paper feed. It shall be robust and noiseless.

6.16.2 Data-logging

Logging shall be done of the following:

a) Alarm/Event logging

All events such as signals and alarms, commanded and uncommanded

changes and limit violations of telemetered parameters shall be printed automatically by

the data-logger with date (year, month and day) and time of occurance (hours, minutes,

seconds and milli-seconds) stamp.

b) Diagnostics

The system shall provide diagnostic checks for faults in

(i) The SCADA equipment at the RCC,

(ii) In the communication lines and

(iii) at the controlled stations

These faults shall be printed out with details such as name of controlled

station, card number with date and time stamp.

c) On-demand facility

The facility shall be provided for the operator to obtain reports on-demand

through the keyboard. Such reports may include current status of bistate devices, signals

and alarms at the remote stations, communication failures, telemetry printout and other

information required.

d) Periodic printouts

The dataloggar shall give periodic printouts, whenever required by the

operator, as under:

(i) 15/30 minutes printout giving average values of all the analogue

parameters at TSSs and SPs during the last 15/30 minute period.

- 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.

- 26 -

6.2.5.3 The voltage at TSS and SP may rise to 30kV for short durations and the

apparent power of the traction power transformer may go upto 200% for 5 minutes

intermittently.

6.2.5.4 Current transducers shall be rated for a 100% overload for 5 minutes and

short time current rating of 50 Amps for 5 second. The burden of voltage and current

shall not normally be more than 4 VA.

6.2.5.5 Since the current transducers shell be connected in series with the

operating coils of protective relays, it is, therefore, essential that loose connections or

open circuiting shall be avoided so as to prevent damage to the CTs and render the

protective system at the TSS ineffective. It shall, therefore, be ensured that:

i) The transducer case is so designed that the current coil terminals

are automatically short circuited in case the transducer is taken out. Labels shall be

provided to notify this aspect prominently.

ii) All terminal connections are rigid.

iii) Wiring to the current coil of transducer is done with PVC insulated

copper cable of cross section not less than 4 sq mm.

6.3 System alarms

The system alarm that shall be provided include at least:

i) Remote station defective

In the event of partial or complete failure of the RTU to communicate with the

master station due to failure of RTU, or on failure of individual I/O modules and other

modules in the RTU, this alarm shall appear. The exact nature of fault shall be indicated

on the VDU.

ii) Master Station defective

In the event of failure of any equipment at master station such as modem,

CPU, bus driver, computer, mimic driving modules or any other items, this alarm shall

appear. The exact nature of fault shall be indicated by LEDs on an indication panel or the

individual module inside the equipment cabinet.

iii) MDB panel fuse fail

In the event of failure of the fuse provided inside the mimic panel for

controlling the supply to various indication lamps/LEDs on the MDB, this shall appear.

- 27 -

6.4 Equipment capacity

6.4.1 Number of controlled stations

The number of controlled stations to be commissioned initially is indicated

in the particular specification referred to in clauses 10 beroof. However, the SCADA

equipment at RCC shall be designed and engineered to control about 120% of the number

of stations to be commissioned initially. The extra capacity shall be available for

expanding the system in future. It shall be possible to realize the extra capacity simply by

adding the required functional modules in the spare sub racks of the mimic driver and

incorporating. Necessary changes in the software and MDB at RCC, without affecting the

existing system either physically or operationally.

6.4.2 Number of telecommands, telesignals and telemetered parameters

(measurands)

6.4.2.1 The SCADA equipment shall be designed for the following capacity of

telecommands, telesignals and telemetered parameters for a typical TSS, SSP, SP and

ATP of a double line section.

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

S. No. Controlled Telecommands Telesignals Measurands

station

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

1 TSS 24* 88 8

2 SP 8* 20 4

3 SSP 8 12 -

4 ATP - 8 -

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

* No of telecommands for faultlocator is not included, it is to be added where applicable.

6.4.2.2 The above figures may vary depending on the layout of TSS, SP, SSP and

ATP in a particular section, which could have three or more tracks, the details of which

will be contained in the particular specification referred to in clause-10 hereof.

6.4.2.3 The number of parameters to be commissioned initially may be less than the

above figures and the balance designed capacity shall be available for future use. A

typical requirement of telecommands, telesignals and telemetered parameters on a double

line section is at Annexure-I.

- 28 -

6.4.2.4 In order to cater for the above requirements the SCADA equipment shall be

designed such that:

(i) (a) The equipment at the various controlled stations is complete in all

respects for the total number of telecommands, telesignals and telemetered parameters to

be utilised initially.

(b) For the balance designed capacity of these parameters, the

equipment is complete in all respects except for the provision of realisable simply by

inserting the interposing contactors/relays/transducers in position as and when required.

For this purpose the wiring shall be terminated at the exact location where the

contactor/relay/transducer is to be provided, in suitable relay bases/terminal blocks.

(ii) The equipment at the RCC shall be designed, engineered and wired

for the designed capacity of telecommands, telesignals and measurands such that the

balance designed capacity can be embedded in the software by making necessary

modification and by inserting necessarily input/output modules in the sub-rack of the

mimic driver.

6.4.2.5 Each telecommand shall include transmission of both ―ON‖ and ―OFF‖

control commands for a circuit breaker/interruptor/motor operated isolator or any other

bi-state device and shall also include corresponding ―ON‖ and ―OFF‖ status telesignals of

the device concerned, confirming execution of the telecommand at the controlled station.

6.4.2.6 The number of telesignals stipulated for each controlled station shall be for

the exclusive use of the railways and shall not include telesignals required for reporting

defects in the RTU.

6.4 Speed of transmission and update time

6.5.1 The communication between the master station and the RTUs shall be at a

suitable transmission speed not exceeding 600 baud, in the case of the trunk cable

specified in clause-5.8 hereof. The normal polling time for updating of status, alarms and

measurands for the designed capacity of controlled stations and for the design capacity of

telecommands, telesignals and measurands shall be not more than 4 seconds for 20

controlled stations and not more than 6 seconds for 30 or more controlled stations.

- 29 -

6.5.2 Whenever the number of controlled stations is more than 30 and the RCC

is located somewhere in the middle of the section, the controlled stations on one side of

the RCC shall be polled simultaneously in parallel with the controlled stations on the

other side RCC, so that the cyclic update time is kept to the barest minimum. The master

station equipment configuration shall be suitable for such simultaneous polling.

6.6 Priority of data exchange between master station and RTUs

While the master station shall normally be polling the RTUs cyclically, the

telecommands shall receive the highest priority. The normal polling shall get interrupted

for sending the telecommand and for receiving the telesignal from the RTU for change of

status resulting from execution of telecommand before normal polling restarts.

6.7 Priority of data exchange between RTUs and Master Station

During polling, the RTU shall transmit data to the master station in the

order of importance. Any tripping of feeder circuit breaker on fault (relay operation) shall

get the highest priority.

6.8 Modems

(i) The modems provided for communication between the master

station and the RTUs shall utilize frequency shift keying (FSK) modulation and include.

Receive and timing functions. The send and receive functions shall be independently

programmed as required. The modem shall work satisfactorily up to an input signal level

of -45dbm. It shall also perform a watch dog role and turn the transmitter off in the event

of any fault occurring within the equipment.

(ii) The modem shall also incorporate necessary amplifiers having a

minimum gain of 30 db to compensate for any signal variation at different point of the

system. Suitable attenuation pads shall be provided within the amplifiers to adjust the

level through trimpot/rotary switch. It shall have an output signal level adjustment

between 0 and 30 dbm in steps of 1 dbm.

(iii) A test switch on the modem shall allow a square wave data pattern

to be transmitted continuously at maximum band rate to allow receiver levels and bias

distortion to be set.

- 30 -

6.9 Construction of the SCADA equipment

6.9.1 The word ―equipment‖ in this clause refers to both master station

equipment and RTUs.

6.9.2 The equipment shall be housed in dust and vermin proof steel cabinets

with doors in the front and rear. The doors shall have proper looking arrangement. The

cabinets shall have facility for bottom entry of incoming/outgoing cables for operation of

the equipment. The steel sheet used for making the cabinets shall be of thickness not less

than 1.6mm and shall be reinforced wherever required. The sheet steel as well as other

iron/steel work shall be properly treated and then applied an under-coat suitable to serve

as base and binder for the finishing coat. The exterior and interior surfaces and the base

frame of the cabinets shall be epoxy power coated in shade to be mutually decided later

between the supplier and the purchaser.

6.9.2.1 The dimensions of the RTU cabinets at TSS and SP/SSP shall not exceed

1750 mm x 800 mm x 650 mm and 1450 mm x 800 mm x 650 mm respectively. At ATP

the RTU cabinet shall preferably be wall mounted type. Every endeavour shall be made

by the manufacturer to offer as small a cabinet as possible. It may be noted that all the

SCADA equipment at RTUs shall be housed inside the cabinet. Provision of sub-

cabinet(s) and/or wall mounted relay/transducer cabinet(s) shall not be permitted.

6.9.3 Integrated circuits (ICs) shall be used to the maximum extent and discrete

components avoided. All semi-conductor components including TCs shall be burnt in

accordance with relevant specification to minimize infant mortality failures. Use of

potentiometers and electro-mechanical devices like relays shall be kept to the absolute

minimum. The number of makes and type of components used shall also be kept to the

minimum. The components shall be from reputed manufacturer, of best quality and wall-

proved in services.

6.9.4 The manufacture of the equipment shall be based on modern practice with

up-to-date technique in order to achieve a robust, versatile and economical construction.

The entire equipment shall be so designed that components/parts of similar equipment

shall be conveniently interchangeable. The entire equipment shall be divided and wired

up in easily removable compact units to facilitate quick attention or replacement by

similar units, without necessitating any soldering or similar messy process. Modular type

of construction shall be adopted to facilitate unit replacement of devices where required.

The solid state components shall be laid out, assembled and arranged in form of printed

cards. Standard plug-in and connector arrangement shall be made for the printed cards so

that contacts and good and firm and arc not affected due to vibrations. Facility of guide

- 31 -

channels and other such aids shall also be incorporated liberally to ensure that printed

cards are properly inserted. The printed circuit cards shall be assembled vertically in

standard 40cm (19‖) sub-racks which are fixed on the main frame of the cabinets.

Suitable check points/diagnostic indications shall be provided on the card for monitoring

its healthiness.

6. 9.5 All the sub-systems and system including modules shall be burnt in for at

least 72 hours at the works of the manufacturer to prove the quality and workmanship.

6.9.6 Suitable labels of approved design shall be provided on all the equipment.

These labels shall contain information related to identification of the equipment and

safety instruction if any.

6.9.7 The equipment and the circuitry shall be such as to provide affective

means to check for correct generation, transmission as well as reception of all signals and

that failure due to internal defects of the equipment or to external disturbances on

transmission circuits shall not cause mal-operation.

6.9.8 The equipment shall be designed and mounted in such a manner that

inspection, cleaning, testing, repairs and renewals, if any, can be carried out conveniently

and expeditiously. Facility for expedition checking of operation of equipment under

working condition shall be provided.

6.9.9 The equipment shall be wired with PVC insulated copper conductors of

adequate size, screened wherever necessary. All wiring shall be suitably colour coded for

easy identification. The bunches of wires shall be neatly dressed and cleated/supported

suitably. Separate wire bunches shall be run for AC & DC power circuits, control and

signal circuits.

6.9.10 All soldering shall be done with good quality solder at proper temperature

to avoid dry soldering.

6.9.11 All the cables which are laid in the cable trenches for the purpose of

interconnecting various equipment shall be rodent proof.

6.9.12 Each type of input/output module employed in the equipment shall be

designed for handling not more than 8 telecomands, 16 status inputs (5 ON+8 OFF), 16

telesignals/alarms or 8 measurands.

- 32 -

6.9.13 All the equipments viz. computer, VDUs, key-boards, date logging

printers etc. and components used in the SCADA system shall be of industrial grade. A

certificate to this effect shall be furnished by the tederer.

6.9.14 The micro-computers used, If any, shall be IBM compatible.

6.9.15 The mimic-driver cabinets and the layout of the traction power supply

diagrams on the MDB shall be so designed as to convert any SP to TSS, if required, by

simply adding the required modules in the mimic driver and making minimum changes in

the MDB.

6.9.16 Construction of MDB

(i) The MDB shall normally be not more than 3.5 m in length for 30

controlled stations, 0.75 m in height and 0.2 m in width, and shall be desk-top/pedestal

mounted close to the operator.

(ii) The MDB shall be made of steel of thickness of 1.6 mm, reinforced

wherever necessary. To prevent corrosion the steel work shall be properly treated and

then given a primary coat of zinc chromate, both on the interior and exterior surfaces

followed by two coats of finishing enamel paint. The inner side shall be finished with

stoved enamel white paint. The external surface shall be finished with stoved enamel

paint of opaline green shade number 275 as per IS:5 or any other colour decided by the

railways, evenly sprayed to present a smooth and pleasing appearance.

(iii) Mimic display of catenary shall be by means of LEDs and metal strips. The

tederer may however offer any other state-of-the-art technique for consideration as an

alternative offer.

(iv) Each circuit breaker & interruptor shall be depicted with the help of a 3

legged LED on the MDB. The LED shall emit red/green colour to indicate

CLOSE/OPEN status respectively. The complementary fault shall be indicated by yellow

colour or dark state of the LED.

(v) Whenever any of the sub-sectors of OHE gets de-energised, the

corresponding portion shall be lit up and start flashing until acknowledged by the

operator.

(vi) The scheme of connections, identification numbers for circuit breakers,

interruptors and motor operated isolators, if any, and other indications on the MDB shall

- 33 -

be so engineered that they are clearly and distinctly visible from a distance of four

meters.

(vii) The MDB shall be wired with PVC insulated copper conductors of adequate

size, screened wherever necessary. All wiring shall be suitably colour coded for easy

identification, neatly arranged and adequately supported. The wiring shall be kept to the

barest minimum and undue losses therein avoided.

6.10 Fuses & Fuse holders

The fuses and holders used for various circuits at the RCC as well as at the

controlled stations shall be of approved quality non-deteriorating cartridge type.

Rewirable type fuses shall not be used unless specific prior approval has been obtained

form the purchaser.

6.11 Cables

Cables of different colours shall be used ac and dc supplies of various

voltage at the RCC as well as at the controlled stations for easy identifications. The 240

V ac cable shall be routed separately for easy identification by the maintenance staff .

Caution plated should also be provided near the terminal connections.

6.12 Special requirements of SCADA equipment

6.12.1 Tripping of bridging circuit breakers on undervoltage at SP

i) Instantaneous type under voltage circuits shall be provided at the SPs,

operated off 27500/110V potential transformers and designed to trip the bridging circuit

breakers if the catenary voltage drops below a preset limit. The operating range for the

circuit shall be adjustable between 15,000V and 20,000V continuously, in steps of

1,000V.

ii) The arrangement shall be such that the bridging circuit breakers can be

closed only when the section on one side of neutral section is dead and the undervoltage

circuit shall become operative only after the bridging circuit breakers is closed.

6.12.2 Interlock release-request facility for circuit breakers/interruptors

control at boundary post

- 34 -

When a controlled station separates the zones controlled by two adjacent

RCCs, control of breakers/interruptors at this controlled station shall be so arranged that

the breakers/interruptors can be operated from one RCC only when an interlock is

released from the other RCC.

6.12.3 Auto reclosing scheme for feeder circuit breaking at TSS

(i) In case of tripping of the feeder circuit breaker on fault at TSS, a

single-shot auto-reclosing scheme recloses that breaker automatically only once, after a

pre-set time delay.

(ii) In the event of any fault on OHE persisting, the feeder circuit

breaker trips again and the auto-reclosing scheme gets automatically ― locked-out ‖ to

prevent reclosing of the breaker a second time. The locked-out condition shall be

telesignalled to RCC. The ―locked-out‖ condition shall be released by the operator when

a telecommand is initiated through the key board console.

(iv) Drawing No.ETI/FSI/0231-1, at appendix-5, indicates the auto-

reclosing scheme. While the relays of the auto-reclosing scheme are provided be the

Railways along with other protective relays panel at TSS. The wiring between

autoreclosing scheme and SCADA equipment at TSS shall be supplied and installed by

the successful tederer.

6.12.4 Automatic localisation of OHE faults

6.12.4..1 This feature of automatic fault localization of OHE faults by the SCADA

system is required in cases where the fault locators described in clause 6.12.5 are not

provided.

6.12.4.2 The system shall be designed for automatic localisation of faults in OHE,

segregation of faulty sub-sector/broken sub-sector and restoration of 25 kV power to

healthy sections of OHE, through a suitable software package incorporated in the

SCADA system. The fault localisation process shall be initiated by the operator through

the key board console.

6.12.4.3 In general, the fault localisation process shall employ the technique of

energising all the sub-sectors/broken sub-sectors that were live prior to the fault one after

the other until it identifies the faulty sub-sector/broken sub-sector by the tripping of the

feeder circuit breaker.

- 35 -

6.12.4.4 The system shall also take following into account while localising the fault

automatically:

(i) Power block(s) imposed on an interruptor:

Whenever power block is imposed on any interruptor, no further control

on that interruptor shall be possible from the master station. For the purpose

of fault localisation, such interruptors shall be assumed as ―open‖.

(ii) Discontinuity caused in any sub-sector due to imposition of power

block on an elementary section of that sub-sector.

6.12.4.5 The software adopted for the fault localisation and isolation process shall:

(i) Take into account the inputs entered by the operator as described

above.

(ii) Ensure that no interruptor that was open prior to the occurrance of

fault by is closed during the fault localization process.

(iii) Segregate the fault by opening minimum number of interruptors.

6.12.5 AT Neutral current ratio type fault Locator.

6.12.5 A special equipment, called AT neutral current ratio type fault locator

(hereinafter referred to as fault locator), may be provided by Railways at the Traction

Sub-stations, Switching Stations (SSP/SP) and at Auto Transformer Posts (ATPs) for

locating catenary/feeder to earth fault on the OHE. The term ― Neutral current ‖ refers to

the current that flows in the connections between the midpoints of the auto-transformers

(ATs)/secondary winding of traction transformer and earth. For the descriptions which

follow reference may be made to the relevant diagrams in Appendix 6.

6.12.5.2 Principle of working of fault locator:

6.12.5.2.1 Measurement of neutral currents.

Whenever a catenary/feeder to earth fault occurs on the OHE, the

corresponding feeder protective relay(s) operates causing the master trip relay to operate

and trip the concerned feeder circuit breaker. One contact of the master trip relay is used

for sending a trip signal to the feeder circuit breaker while another contact is used for

sending an initiate‘ command to the fault locator at the TSS. On receipt of the initiate

- 36 -

command, the fault locator at the TSS starts measuring the neutral current of the auto-

transformers/traction power transformer at the TSS, and sends a ―Fault Start‖ signal to

the other fault locators at the switching stations/ATPs upto and including the SP In case

of normal feeding condition, and upto and including the adjacent TSS in case of extended

feeding condition through the telecommunication cable. On receipt of the fault-start

signal, the fault locators start measuring the neutral currents of the auto-transformers. The

measurement takes about 40 ms from the instant the master trip relay at the TSS has

operated. The neutral currents measured are stored in the fault locators in Binary Coded

Decimal (BCD) form in two digits (8 bits).

6.12.5.2.2 Transmission of neutral currents data to RCC.

After a neutral current measurement, the fault locator transmits a ―RTU-

start‖ signal to the remote terminal unit (RTU) by closing a normally open contact. On

receipt of the RTU-start signal, the RTU will receive and store the neutral current data

(which is in 11 bits-8 bits for neutral current and 3 bits for AT number) and send a ‗Re-

set‘ signal to the fault locator to re-set the fault locator for further operation. The neutral

current data so received shall be transmitted to the master station equipment by the RTU

during the normal scanning.

6.12.5.2.3 Calculation of the kilometerage of the fault point.

After receiving the neutral current data from all the RTU‘s in the zone fed

by the feeder circuit breaker which tripped under fault, the kilometerage of the fault point

shall be calculated by the master station equipment in accordance with the procedure

given below:-

(i) Pick up the two neighbouring auto-transformers which recorded the highest

and second highest neutral currents.

(ii) Calculate the kilometerage of the fault point by using the following

equation:

Ln+1 – Ln In+1

L = Ln+ x (100 x - Q1)

100-Q1-Q2 In + In+1

- 37 -

where,

Ln, Ln+l = kilometerage of the ATs which recorded the highest/second highest

neutral currents.

In, In+1 = The neutral currents recorded by the ATs at the location Ln, Ln+1

respectively.

Q1, Q2 = Constants for the ATs concerned (varying between 5 and 15).

L = kilometerage of the fault point.

6.12.5.2.4 After calculating the kiloneterage of the fault point, a suitable message

shall appear on the VDU, giving the kilometerage of the fault point, TSS/SSP/SP/ATPs

concerned. The massage shall also be printed by the data-logger.

6.12.5.2.5 For the purpose of calculating the kilometerage of the fault point, the

master station equipment shall have the kilometerage of the ATs and the constants for all

the ATs required for the calculation stored in the data-base of the SCADA software. It

shall be possible to store two different kilometerage for an AT (i.e. one kilometerage for

each of the two directions) to cater for situations where the reference point for the

kilometerage may change the kilometerage/constants in the data-base by simple

operations by the operator as and when necessary.

6.12.5.3 Number of neutral currants at TSS/SP/SSP/ATP.

The interfacing between the fault locator and the RTU shall be for two

neutral currents in case of a TSS/SP (one neutral current for each of the two directions),

and one neutral current in case of a SSP/ATP. However, where a TSS feeds only one

direction, the interfacing at the TSS is required only for one neutral current.

6.12.5.4 Call-start tele-command for TSS

Provision exists in the fault locator at the TSS for checking the functioning

of the fault locators by sending a ―Call-start‖ signal to he fault locator at the TSS. For this

purpose two call-start tele-commands shall be provided in the SCADA system for each

TSS, one tele-command for each of the two directions from the TSS. However, where a

TSS feeds only in one direction, only one call-start tele-command is required.

6.12.5.5 Feed extend/Food normal tele-command for SP.

Whenever feed is extended from one TSS to the adjacent TSS, it is

necessary to send a ‗feed-extend‘ tele-command‘ to the fault locator at the SP between

the two TSSs. Similarly, whenever the feed is restored to the normal condition, it is

necessary to send a ‗feed-normal‘ tele-command to the fault locator at the SP. For this

purpose two tele-commands shall be provided shall be provided in the SCADA system

- 38 -

for each SP one tele-command will make a potential-free normally open contact in the

RTU ―Closed‖(for extended feed condition), the other tele-command will make the

normally open contact ―Open‖ (For normal feed condition).

6.12.5.6 Strong and VDU display of neutral currents.

Whenever neutral currents are received at the master station from the

RTUs in the feeding zone of a TSS, the neutral currents data shall be stored in memory.

The SCADA software shall support VDU display of the neutral current in the tabular

form to indicate date/time, dispatch station, data received and neutral current value. It

shall be possible to have a print out of the same on the data-logger.

6.12.5.7 Wiring.

The supply of cables and wiring between the fault locator and the RTU

shall be done by the successful tenderer.

6.12.5.8 The telecommands for the fault locator at TSS/SP and telemetry of neutral

currents data have not been catered for in the equipment capacity specified in clause

6.4.2. The requirements given in clauses 6.12.5.1 to 6.12.5.7 above shall be catered for in

the SCADA system in addition to that stipulated in clause 6.4.

6.13 Tripping of feeder circuit breaker in case of PT fuse failure The SCADA system shall cause the feeder circuit breaker to trip in case

the fuse of the associated potential transformer fails.

7.0 Instruments, Testing Equipment and Tools

7.1 The tenderer shall quote for the following giving unit prices of individual

items:

(i) Instruments including two level meters, two portable dual trace

oscilloscope (0-25 MHz) and four digital multimeters required for the maintenance and

xxxx of the equipment offered, pamphlets giving full technical and other details of the

instruments shall be furnished along with the offer.

(ii) Diagnostic kit and logic probes for ―on-line‖ and ―off-line‖

trouble-shooting and repairs. The diagnostic kit shall be comprehensive and capable of

testing all types of modules employed in the SCDA equipment for their normal

functioning and to identify the faulty zone.

(iii) Any other standard or special testing and diagnostic equipment

necessary for preventive as well as corrective maintenance of the various

parts/components of the SCADA equipment.

(iv) Complete set of tools required for maintenance of the SCADA

equipment.

- 39 -

7.2 The required quantity of instruments, test equipments and tools shall be

indicated to the successful tenderer at the time of issue of the contract.

8.0 Spares

8.1 The tenderer shall quote for spares as indicated below for the SCADA

equipment:

i) Modules of various types (including 10% of each type

power supply units) used at RCC.

ii) Modules of various types (including 10% of each type

power supply units) used at controlled stations.

iii) Spare transducers and summation CTs One of each type

iv) Interposing relays 10% of each type

v) Components such as critical ICs 20% of each type

vi) Read relays 20% of each type

vii) Various types of lamps/LEDs used 10% of each type

on MDB

viii) Spares for individual items As considered

such as printer etc necessary for

a period of

2 years.

ix) Spare keyboard for VDU one

8.2 The tenderer shall confirm in his offer the availability of spares for a

period of 15 years after commissioning of the equipment.

9.0 Technical deviations

The tenderer shall specifically indicate in a statement attached with his

offer, his compliance with each clause and sub clause of this specification. A separate

statement shall be attached with the offer indicating reference to the clauses where the

tenderer deviates therefrom together with detailed remarks/justification. If either the

- 40 -

statement of compliance or statement of deviations is not attached with the offer, it is not

likely to be considered. If there are no deviations, a ‗NIL‘ statement shall be attached.

10.0 Particular specification

Particular specification giving details of the location of RCC, repeater

the purchaser. stations, stations to be controlled, number of telecommands, telesignals

and telemetered parameters at each on the controlled stations and other detail will be

furnished separately by the purchaser.

11.0 Type Tests

11.1 The type tests shall be carried out in the presence of the purchaser‘s

representative at the manufacturer‘s works on a complete set of equipment (sending end

and receiving end) to prove the quality of the design and workmanship and there

conformity with the specification. If any of the type tests on components have already

been successfully carried out, repetition of such tests may be waived, provided photostat

copies of the type tests certificates and other particulars are submitted and got approved

by the purchaser.

11.2 Before giving the call to RDSO/the Chief Electrical Engineer for

inspection and testing of the prototype of the system, the manufacturer shall submit a

detailed test schedule consisting of schematic circuit diagrams for each of the tests and

nature of the test, venue of the test and the duration of each test and the total number of

days required to completer the test at one stretch. Once the schedule is approves, the test

shall invariably be done accordingly. However, during the process of type testing or even

later, RDSO representative reserves the right to conduct any additional test(s) besides

those specified herein, on any equipment/sub-system or system so as to test the system to

his satisfaction or for gaining additional information and knowledge. In case any dispute

or disagreement arises between the manufacture and RDSO/the Chief electrical Engineer

during the process of testing as regards the type tests and/or the interpretation and

acceptability of the type test results, it shall be brought to the notice of the Director

General(Traction Installations), RDSO/the Chief Electrical Engineer as the case any be,

whose decision shall be final and binding.

11.3 The type tests shall include visual inspection, insulation resistance test,

power frequency high voltage withstand test, functional tests, operational tests and test on

major components. The detail of tests to be carried out shall be finalized by mutual

consultation between the purchaser the successful tederer.

- 41 -

11.4 Only after clear written approval of the result of the tests on the prototype

unit is communicated by RDSO/Purchaser to the manufacturer, shall be take up bulk

manufacture of the ordered equipment which shall be strictly with the same materials and

processed adopted for prototype unit. In no circumstances shall the material, other the

those approved in the design/drawings and/or prototype.

11.5 The successful tenderer shall be required to supply 3 sets of type test

reports to the purchaser.

12.0 Erection and Commissioning tests

The creation and commissioning of SCADA equipment shall be done bye

the successful tenderer who will arrange all tools, plants, instruments and other materials

required for the purpose at his own cost. Tests shall be carried out during creation/

commissioning of the equipment at site. The successful tenderer shall be required to

submit to the purchaser the details of the checks and tests to be carried out during

erection and commissioning.

13.0 Tests after installation and commissioning of the equipments

Tests shall be carried out on the complete equipment in the presence of the

purchaser representative to check the erection and commissioning of the equipment. This

shall include functional tests, checking of adjustment of transducers, limit settings of

measurands, cyclic update time, telecommand execution time, signal levels both on the

send and receive side of the various modems for satisfactory operation of the equipment,

and others. Three sets of the test report shall be supplied to the purchaser for record.

14.0 Technical data, Drawings and Information

14.1 The tenderer shall furnish guaranteed performance data, technical an other

particulars of the equipment offered in the proforma at annexure -2.

14.2 The information furnished in schedule of guaranteed performance data,

technical and other particular (Annexure-2) shall be complete in all respects. If there is

any entry like shall be furnished later or blanks are left against any item, the tender is not

likely to we considered as such omissions causes dele in finalising the tender.

14.3 The tenderer shall submit alongwith his offer the following:

- 42 -

a) System diagram of the SCADA equipment showing general layout of

RTUs and and there connection with waster station equipment through

communication cables.

b) Hardware configuration of master station equipment.

c) Hardware configuration of RTUs (TSS, SSP, SP and ATP).

d) Software configuration of mater station equipment.

e) Software configuration of RTUs.

f) A write-up explaining the principle of operation of the equipment.

g) The General arrangement drawing of the HDB at RCC, indicating the

catenary indications, equipment status indications, aanunciations and lettering for

controlled station.

h) The General arrangement drawing of waster station equipment cabinet,

showing module layout.

i) The General arrangement drawing of RTU cabinet (TSS,SSP,SP and ATP)

showing module layout, transducers and interposing relays.

j) A detailed write-up giving the details of SCADA software including the

communication protocol and transmission security.

k) Any other detail considered necessary for the proper the understanding of

the system.

NOTE: The general arrangement drawing should also indicate the overall

dimensions as well as mounting details.

14.4 The successful tenderer shall be required to submit the following:

a) Detail drawings for approval of the purchaser in Railways standard

sizes of 210mm x 297mm or any internal multiple thereof. These drawings shall cover

schematic circuit diagrams, block diagrams, layout of equipment at RCC and at

controlled stations, constructional details of various equipment at RCC and at controlled

stations, layout of various modules in equipment cabinets at RCC and at controlled

stations, interconnection diagram between Railways power equipment and remote control

equipment, and wirings diagrams. The manufacture of the equipment shall be taken up by

the successful tenderer, only after approval of the drawings by the purchaser.

b) Circuit schematic and explanation with full technical details of the

equipment.

- 43 -

c) Detailed step by step procedure for operation, maintenances and

repairs of the system and individual equipments, indicating procedure for trouble-

shooting, measurement of various signals at different points and diagnostic check to be

adopted for repairs at site.

d) Details of various RCC modules indicating rating and modification

number and layout of equipment.

10 Details of SCADA software, including operating instructions.

14.5 Only after all the designer and drawings have been approved and

clearance given by RDSO to this xxxx the manufacturer shall take up manufacturer of the

prototype unit for RDSO inspection. It is so clearly understood that any change required

to be done in the prototype unit as required RDSO shall be done expeditiously.

14.5 The successful tenderer shall be required to supply 3 prints of the final

approved drawings and 3 dates of reproducible tracings.

14.6 The successful tenderer shall supply 10 copies of technical booklets giving

detailed description of the equipment, constructional features, ratings and characteristics

and instruction for operation and maintenance of the system as well as of individual

equipment.

15. Training of Railway staff

The offer shall include the training of two Engineers and six Supervisors

of the Indian Railways free of cost at the manufacturers in India and abroad. The total

duration of training shall be 12 weeks, of which approximately six weeks will be at

manufacturers works and six weeks on a railway system or 0ther pubic utility. The cost of

travel to the country of manufacture and back will be borne by the Indian Railways.

Other details shall be settled at the time of finalising the contract or purchase order.

The training shall cover the following aspects:

a) Study of system engineering and trouble shooting of all modules

and system faults.

b) Training in operation of SCADA equipment and Man-Machine interaction.

c) Erection, testing, commissioning and adjustments required in service of the equipment. 16. Warranty 16.1 The SCADA equipment supplied against a purchase order/contract in which this specification is quoted, irrespective of origin of individual equipment (imported/indigenous), shall be guaranteed for trouble-free and satisfactory performance for a period of 18 months from the date of supply or 12 months from the date of

- 44 -

commissioning, whichever period is shorter. Details of warranty clause, the extent of responsibility and other relevant aspects shall be included in the purchase order or contract. The tenderer shall furnish detailed terms and conditions in this regard in his offer. 16.2 The successful tenderer shall make necessary arrangements for closely monitoring the performance of the SCADA equipment through periodical (preferably once in two months during the warranty period) visits to the RCC and the various controlled stations for on the spot detailed observations. Arrangements shall also be made for spare parts, modules and other items to be kept readily available with the manufacturer/supplier/successful tenderer to meet exigencies warranting replacement, so as to put back the SCADA equipment in service without unduly affecting the operations of the Traction Power Controller.

- 45 -

ANNEXURE-I

TYPICAL REQUIREMENT OF TELECOMMANDS, TELESIGNALS

AND TELEMETERED PARAMETERS IN A DOUBLE LINE SECTION AT TSS,

SP, SSP AND ATP

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

DESCRIPTION TSS SP SSP ATP

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

A. Telecommands

1. 220/132/110/66 kV 2 (3)* - - -

circuit breakers

2. 25 kV circuit breakers 10 (9) 2 - -

3. 25 kV Interrruptors 2 2 5 -

4. Auto-recloser ―Release‖ 4 - - -

With locked out indication

5. Transformer tap changer 2 (3) - - -

6. Interlock release request (as applicable) - - -

at boundary post

7. Spares (for locoshed feeders 4 (3) 4 3 -

motorized isolators, etc.

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Total: 24** 8** 8 -

- - - - - - - -- - - - - - - - - - - - - - - - - - - - - - - - - - - -

* The figures given in the brackets are for traction substation having three

single phase (V-connected) transformers.

The figures given outside the brackets are for traction substation having two

scott-connected transformers.

** No. of telecommands required for fault locator as per C1.6.12.5 is to be

added where applicable as the same has not been included.

- 46 -

B. Telesignals

For details of telesignals actually required, clause 5.5.1 may by refered to.

C. Telemetered parameters

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

DESCRIPTION TSS SP SSP ATP

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

1. 25 kV Bus/OHE voltage 2 2 - -

2. Feeder current 2 - - -

Spares 4 2 - -

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Total: 8*** 4*** - -

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

*** Telemetered parameters required for fault locator have not been included in

the above table. The same are received from fault locator in digital form.

- 47 -

ANNEXURE-2

SCHEDULE OF GURANTEED PERFORMANCE DATA, TECHNICAL DATA,

TECHNICAL AND OTHER PARTICULARS

1. Maker‘s name and country of origin.

2. Manufacturer‘s type destination.

3. Details of mini/micro-computers at RCC

i) Make & type

ii) Power supply required for operation.

iii) Permissible variation in power supply voltage and frequency

iv) Main semi-conductor RAM memory size

v) Other detailed particulars along with technical pamphlets.

4. Name of equipment for which 100% standby is provided at RCC.

5. Arrangement of changeover from on line to standby system

(manual/automatic, electronic, electrical).

6. Hard disk memory capacity of each computer system (main/standby).

7. Hard disk memory capacity of each computer system (main/standby).

8. Colour VDUs

i) Make & type

ii) Size of screen

iii) Whether fully graphic or semi-graphic

iv) Number of background and foreground colours

v) Does it conform to clause-6.1.2.2.?

vi) Other detailed particulars along with technical pamphlets.

9. Key-boards for VDUs

i) Make & type

ii) Whether functional keys and alpha-numeric keys are provided on

separate keyboards or integrated in one ?.

iii) Other detailed particulars along with technical pamphlets.

- 48 -

10. Data-logging printers

i) Make & type

ii) Speed in characters per second

iii) Number of characters per line

iv) Power supply required for operation

v) Other detailed particulars along with technical pamphlets.

11. Mimic diagram board

i) Indication LEDs/magnetic semaphore indicators for circuit

breaker/interruptor/motor operated isolator-type, voltage rating and

wattage.

ii) Hooter voltage rating and wattage

iii) Annunciation window LEDs-voltage rating and wattage.

iv) Does it conform to clause-6.1.3?

12. UPS at RCC

i) Makes & type

ii) Ratings

iii) Input power supply

iv) Permissible variation in input power supply voltage and frequency.

v) Inverter output voltage and frequency

vi) Variation in inverter output voltage from no-load to full load

vii) Permissible variation in battery voltage for satisfactory operation

of inverter

viii) Rectifier ratings

ix) Inverter ratings

x) Efficiency of rectifier at rated output

xi) Efficiency of inverter at rated output

xii) Does it conform to clause-6.1.5?

xiii) Is automatic changeover switch provided as per clause-6.1.5.?

xiv) Acoustic noise level

xv) Are equipment earthling terminals provided as per relevant

standards?

xvi) Maximum temperature inside the cabinet of the UPS, under normal

working conditions.

xvii) Other detailed particulars along with technical pamphlets.

13. Battery for UPS

i) Make & type

- 49 -

ii) Battery voltage and ampere-hour capacity

iii) Is the battery rated to provide 2 hours standby, in case of input a.c.

supply failure to the UPS?

14. Load at nominal inverter output voltage

i) Load at nominal inverter output voltage.

ii) Load on battery in case of input a.c. supply failure to the UPS.

15. Software details

i) Operating system used at RCC

ii) High level language compliers provided in the system at RCC.

iii) Does the software meet the requirement of clause-6.1.4 ?

iv) Is the communication protocol with complete details enclosed?

v) Hamming distance of the error checking system used for detecting

errors in transmission.

vi) Are the SCADA software and operating system details enclosed?

vii) Are the limit settings of measurands selectable through software as

per clause 6.2.4.2 ?

16. Cyclic update time for updating of designed capacity of statue, alarm and

measurand for:

i) Total number of RTUs to be commissioned initially.

ii) Total number of RTUs as per designed capacity.

iii) Are calculations for the update time enclosed?

17. Maximum time taken for execution of any control command including

confirmation of back indication.

18. Modems

i) Make & type

ii) Operating speed range (in bauds)

iii) Actual transmission speed from master station to RTUs and carrier

frequency adopted.

iv) Actual transmission speed from RTUs to master station and carrier

frequency adopted.

v) Half duplex/full duplex

vi) Type of modulation

- 50 -

vii) Output signal level on send side:

Nominal ……….

Maximum ……….

Minimum ……….

viii) Threshold values of input signal on receive side

Maximum ……….

Minimum ……….

ix) Dynamic range

x) Maximum gain provided in the amplifier

xi) Indications provided for fault diagnostics

xii) Are the modems and the transmission speed suitable for the

communication mediums specified in clause 5.8, 5.9 & 5.10 ?

19. Power Supply for RTUs

i) Power supply required for operation of RTU

ii) Permissible variation in power supply voltage and frequency

iii) Is the RTU designed for Operating from both ac & dc supply, as

per clause-6.2.3 ?

iv) Load of the RTU for designed capacity of parameters as per clause

6.2.3 at 240V ac single phase vis-a-vis 110V d.c :

240V a.c. 110V d.c.

- At TSS

- At SP

- At SSP

- At ATP

20. Are events and alarm stored in the RTU, as per Clause-6.2.2 ?

21. Do the RTUs meet the requirements of Clause-6.2 ?

22. Catenary voltage indication circuits in RTU

i) Voltage at which the catenary voltage indication circuit work.

ii) Pick up voltage of the circuit ( please indicate range)

iii) Drop off voltage of the circuit ( please indicate range)

23. Catenary under voltage circuit in the ETU at SP

i) Voltage at which the catenary under voltage circuit at sectioning and

paralleling post (SP) works.

- 51 -

ii) Limits (field settable) within which the catenary under voltage

circuit can be set to trip the bridging interruptor.

24. PT fuse fail circuits in the RTU at TSS

i) Voltage at which the PT fuse fail circuit works.

ii) Minimum pick up voltage of the circuit

iii) Drop off voltage of the circuit.

25. Interposing contactors/relays in the RTUs

Type & make Operating voltage Current carrying

capacity of

contacts.

a) Telecommands

i) On command

ii) Off command

iii) On status

iv) Off status

b) Alarms

i) Alarm relays ( Suitable for 110 v d. c. operation)

26. Range of setting provided in the solid state comparator circuit in the RTU

for 110V d.c. low indication.

27. Are the telesignals at the controlled stations monitored as per clause 5.5.3. ?

28. Furnish details of the no-volt relays used for ―ac fall‖ and ―PT fues fail‖

indications.

29. Details of transducers

a) Voltage transducers

i) Make and type

ii) Range

iii) Input

iv) Output

- 52 -

v) Characteristics

vi) Response time

vii) Accuracy

viii) Burden in VA

ix) Self powered/auxiliary powered

b) Current transducers

i) Make and type

ii) Range

iii) Input

iv) Output

v) Characteristics

vi) Response time

vii) Accuracy

viii) Burden in VA

ix) Self powered/auxiliary powered

30. Are the special requirement of the SCADA equipment specified in clause

6.12, met with?

31. Time taken to complete inter-tripping process from the instance of operation

of W. P. C. relay at TSS.

32. Equipment capacity at the RCC

a) Maximum number of controlled stations,

telecommands, telesignals and measurands that

can be accommodated in the system offered

i) Controlled stations

ii) Telecommands

iii) Telesignals

iv) Measurands

b) Number of controlled stations for which the

equipment offered is complete in all respects and

which are to be commissioned initioally:

i) TSS

ii) SP

iii) SSP

iv) ATP

- 53 -

c) Number of controlled stations that can be added

in figure by simply adding functional modules in

the mimic driver for states/alarm out puts and

incorporating, necessary changes in the software

and the HDD, without effecting the existing

system either physically or operationally.

d) Number of telecommands, telesigmnals and

measurands per controlled station for which the

equipment is complete in all respects including

functional modules.

TSS SP SSP ATP

i) Telecommand

ii) Telesignals

iii) Measurands

33. Equipment capacity at the RTUs

a) Number of telecommands, telesignals and

measurands, per controlled station for which the

equipment has been designed, engineeredand

wired up except for end stage interposing relays

and transducers.

TSS SP SSP ATP

i) Telecommands

ii) Telesignals

iii) Measurands

b) Number of telecommands, telesignals and

measurands per controlled station for which the

equipment is complete in all respects including

end stage interposing relays, tranducers andeither

items.

TSS SP SSP ATP

- 54 -

i) Telecommands

ii) Telesignals

iii) Measurands

34. Number of devices / alarms / measurands controlled by each module is

RTU.

i) Control and status module

ii) Alarm module

iii) Analogue module

35. Number of devices / alarms controlled by each module in this mimic

driver at RCC.

i) Status module

ii) Alarm module

36. Are all the equipment used in the SCADA system of industrial grade, as

per Clause 6.9.13?

37. Diagnostic kit

i) Make and Type

ii) Give detailed particulars

iii) Does the kit conform to clause 7.1(ii) ?

38. Oscilloscope

i) Make and type

ii) Other detailed particulars along with technical pamphlets.

39. Multimeter

i) Make and type

ii) Other detailed particulars along with technical pamphlets.

- 55 -

40. Level meters ( dB Meter)

i) Make and type

ii) Other detailed particulars along with technical pamphlets.

41. Dimensions

Overall dimensions of –

i) Mimic panel.

ii) Equipment cabinate at remote control centers.

iii) Equipment cabinate at controlled stations:

a) TSS

b) SP

c) SSP

d) ATP

42. Are the enclosures, specified in clause- 14.3. enclosed along with the

offer?

- 56 -

ANUEXURE= 3

SALIENT FEAATURES OF 25KV CURRENT AND POTENTIAL

TRANSFORMERS

A) Current Transformers

i) Type Low reactance, single phase, oil filled,

self-cooled scaled outdoor types.

ii) a) National system voltage 27 kV

b) highest equipment voltage 52 kV

iii) Frequency 50 Hz

iv) Rated primary current 1000/500 A

v) Rated secondary current 5 A.

vi) Rated transformation ratio 1000-500/5

vii) Rated burden 60 VA

viii)Accuracy class 5P

- 57 -

ix) Rated accuracy limit factor 15

x) Rated short-time thermal current 25 kA (r.m.s.) for 1sec.

xi) Rated dynamic current 62.5 kA (peck)

B) Potential transformers, Type III

i) Type Oil- immersed, self-cooled, core / shell

type, suitable for outdoor use.

ii) Rated system voltage 25kV nominal subject to variation from 19 kV

. to 30 kV.

iii) Frequency 50 Hz

iv) type of connection Between Phase and earth

c) Potential Transformers, Type-III ( Cont.)

v) Rated primary voltage 27.5 kV

vi) Rated secondary voltage 110 VA

vii) Rated burden 100 VA

viii) Class of insulation ‗A‘ class

ix) Rated voltage factor 1.1 (Continuous)

-----------------

- 58 -

- 59 -

- 60 -

- 61 -

SS -TRACTION SUBSTAION.

TP -AUTO TRANSFORMER POST.

SP SUB-SECTIONING AND PARALLELING POST.

P -SECTIONING POST.

B -CIRCUIT BREAKER.

-RY1, P-RY2 -CONTACTS OF PROTECTIVE RELAYS FOR CIRCUIT-

-RY-3 BREAKERS CB1, CB2, CB3 RESPECTIVELY.

-FAULT LOCATOR.

DM -MODEM.

TU -REMOTE TERMINAL UNIT.

-ST1, CST2, -CALL-START TELE COMMAND FOR CB-1, CB-2, AND

-ST3 CB-3 RESPECTIVELY,

ED -N/O CONTACT OF RTU FOR FEED EXTENDING

PURPOSE. [THIS CONTACT SHALL REMAIN OPEN IN

NORMAL FEED CONDITION AND REMAIN CLOSED

- 62 -

IN EXTENDED FEED CONDITION]

-INT -DATA INTERFACE

Note:-

In case of underground telecommunication trunk cable, no modems (MDM)

are required. The fault locators from TSS to SP shall be directly connected through one

pair (two wire) of metal conductors of the trunk cable. No isolating transformer shall be

provided in the trunk cable.

- 63 -