Section 3: Installation of Relay Interlocking PDF

Section 3: Installation of Relay Interlocking 21.3.1 Wiring and Relay Racks (a) The wiring used in various equipment shall comply with the requirements laid down in IRS specification No. S 23. (b) All wiring in the cabin and locations shall be done in a neat manner so that...

Section 3: Installation of Relay Interlocking 21.3.1 Wiring and Relay Racks (a) The wiring used in various equipment shall comply with the requirements laid down in IRS specification No. S 23. (b) All wiring in the cabin and locations shall be done in a neat manner so that the wiring does not in any way prevent the proper functioning over working parts and is easily accessible for maintenance. (c) All wiring in the cabin and location shall be terminated on approved type terminal blocks/tag blocks unless otherwise specially permitted. (d) At all locations and cabins, cable/entry arrangements of adequate size, conveniently located for ease of approach to terminals and other equipment so arranged as to protect the wires from damage, shall be provided. Such cable/entry arrangements shall be plugged and sealed with suitable compound after the wiring is completed. (e) The internal wiring of relay rack in locations and cabin shall be generally carried out with plain annealed copper conductors; PVC insulated unarmoured flame retarding type of 1100 V grade unless otherwise specially permitted. The size of the conductors may be as follows: Type Size (a) Single Core size 1 mm (b) Multi core each core of size 1 mm (c) Multi core each core of size 0.6 mm (d) Flexible insulated wire size 16/0.20 mm (e) Flexible multi strand wire size 3/0.75 mm (f) Rack to rack wiring shall be generally carried out with multi core cable having plain annealed copper single core conductor of size 1/0.6 mm or multi-strand 16/0.2 mm as per approved specification for indoor cables. (g) Following practice shall be adopted for internal wiring. The connecting wires shall be terminated on eyelets/lugs/receptacles unless otherwise specially permitted. (i) All connections to plug-in non-proved type relays flexible wire of 16/0.20 mm shall be used. (ii) All connections to proved typed relays shall be done with 0.6/1 mm single strand multi core cable. (iii) For all connections from cable terminations to tag blocks and indicators etc. shall be done with the help of 1 mm single strand wires. (iv) For all connections to circuit breakers, lever locks etc. single strand wire of 1.5/1.6 sq. mm size shall be used. Chapter 21: Relay & Electronic Interlocking Page 452 of 530  (h) Relay to Relay wiring on the same rack should be as far as possible direct without intermediaries like tag block/terminals. (i) Identification Marker for identifying the terminals and tags shall be provided to each terminal to identify the circuits for which it is used. (j) Relay racks shall have sufficient capacity to take additional equipment to the extent of 15% of equipment provided to permit additions and alterations. (k) Charts showing the position of relays on relay racks and contact analysis of relays indicating the spare and used contacts shall be prepared and kept in the relay room. (l) For future expansion, provision shall be made to accommodate additional relays, relay groups & racks in the relay room. 21.3.2 Fuses, Terminals and Terminal Links (a) Cartridge type fuses shall preferably be of Non deteriorating type. Where screw cap cartridge type fuses are used, these shall be of different colour codes for different current rating and these shall be non - interchangeable. (b) Fuses shall be so grouped that blowing of a fuse has minimum repercussion on train operation. (c) The fuses when blown off, shall preferably give a visual indication. (d) Each group of circuits shall be carefully protected by fuses in the cabins and in location to facilitate easy fault localization. (e) Fuses shall be so arranged that they can be easily replaced without causing interference or unsafe conditions to other circuits. (f) Cartridge fuse links shall be approved type. (g) The terminal block and tag blocks shall be of approved type unless otherwise specially permitted. (h) The terminal boards provided at the locations and other places shall be provided with suitable links to facilitate isolation of the two sides of the circuits which are connected through the terminal links. (i) For vital circuit fuse auto change over system of approved type to be provided. 21.3.3 Power Supply Arrangements The power supply systems for Signalling Installations shall be as per details given in Chapter 16 on "Power Supply Arrangement systems for Signalling Installations". 21.3.4 General Arrangements (a) Air conditioning may be provided for every signalling interlocking (PI/RRI) installation with more than 100 routes. For E.I installations air conditioning may be provided irrespective of number of routes to improve reliability. Chapter 21: Relay & Electronic Interlocking Page 453 of 530  (b) For other signalling installations, with less than 100 routes, air-conditioning may be provided for those installations which are (i) prone to dust (coal dust, stone dust, iron ore etc.) or (ii) in the vicinity of chemical/fertilizer/other industrial factories releasing harmful fumes or (iii) in areas with extreme temperature with the agreement of PCSTE and PCEE. (c) AC equipments shall be provided and maintained by Electrical department. Such ACs shall be connected with the local power supply. The switch to operate AC shall be outside the relay room. (d) 'Automatic Fire Detection and Alarm System' may be provided at all stations irrespective of number of routes. (e) Automatic Fire Suppression System' along with “Automatic Fire Detection And Alarm System“ may be provided at stations with more than 400 routes. Note: In case provision of “Automatic fire suppression system” along with “Automatic Fire Detection And Alarm System” is considered desirable by Zonal Railways at critical stations and important junction stations even below 400 routes, same may be provided with the approval of competent authority (i.e. PCSTE). (f) Firefighting equipment shall also be kept in the power supply equipment room. (g) Suitable standard earthing shall be provided for all control panel, power supply, switch board, transformers, inverters etc. (h) At all Relay Interlocking Installations, Data Logger shall be provided. (i) Communication between the SM's panel room, relay room, equipment room and locations shall be provided. 21.3.5 Lightning & surge protection, Earthing: Shall be done as per Section 5 of this chapter. 21.3.6 Testing & Commissioning of Relay Interlocking: (a) Once the indoor wiring works are completed before conducting the system Integrity testing, simulation test shall be conducted by simulating field gears such as Track circuits, Signals & Points on a simulation panel and errors removed. This will ensure the correctness of indoor wiring before connecting to outdoor gears. (b) Testing of wiring & Commissioning shall be done as per Para 19.8.5 to 19.8.12. (c) Recommended check list of items for commissioning is given at Annexure: 21-A2. This list may be suitably modified as needed. Chapter 21: Relay & Electronic Interlocking Page 454 of 530