Chapter 21: Relay & Electronic Interlocking PDF

Note: (i) FAT should preferably be conducted at factory premises. However, FAT can also be done at railway premises at central location but not at the site. For this, the setup should be made by all the Zonal Railways. (ii) FAT & SAT should be done by separate...

Note: (i) FAT should preferably be conducted at factory premises. However, FAT can also be done at railway premises at central location but not at the site. For this, the setup should be made by all the Zonal Railways. (ii) FAT & SAT should be done by separate officials where ever feasible. 21.5.3 Power Supply for Electronic Interlocking (a) Adequate redundancy in power supply arrangements for E.I systems including Control Terminals shall be provided as per approved specifications and guidelines. (b) Wires connecting equipment shall be of adequate size so that there is not more than 0.5% loss in voltage. (c) The power supply for fan shall be fed with separate external supply, which should be completely isolated from Electronic interlocking supply and same shall be provided with fuse. 21.5.4 Lightning & surge protection, Earthing: Shall be done as per Section 7 of this chapter 21.5.5 Testing & Commissioning of Electronic Interlocking: Wiring, Testing & Commissioning shall be done as per Para 19.8.5 to 19.8.12. Recommended check list of items for commissioning is given at Annexure: 21- A2. This list may be suitably modified as needed. Section 6: Maintenance of Interlocking 21.6.1 Periodicity of Tests (for existing installations-Relay interlocking/Electronic Interlocking) All the tests indicated in this chapter shall be conducted at the time of new installation or making any alteration to the existing installations. (a) In a working installation, the following periodical tests shall be done: (i) Physical inspection once in a year or earlier as feasible. (ii) System integrity test as per para 19.8.8 once in five year or earlier if interlocking is altered. (iii) Insulation tests on Cables as per Chapter 15 of SEM. (iv) Test of individual equipment in accordance with specifications and instructions applicable for each apparatus as stipulated in current Chapter. (b) It will be personal responsibility of SSE/JE (Signal) to test all Electrical signalling circuits of relay interlocking up to 20 routes. (c) It will be personal responsibility of ASTE/DSTE concerned to test all electrical signalling circuits of relay interlocking with more than 20 routes. Chapter 21: Relay & Electronic Interlocking Page 461 of 530 21.6.2 Specific tests for Electronic interlocking (a) Maintenance of Electronic Interlocking system shall be done as per approved system maintenance manuals. A general maintenance schedule for Electronic interlocking is provided for guidance at Annexure: 21-MS3 in Appendix I. Note: At stations having dense traffic and high speed, the Railways may prescribe more frequent inspections, if considered necessary. (b) Maintenance Terminal of Electronic Interlocking system shall be provided in the Signal Technician Duty room. (c) Latest E.I station database files (application logic, Control Terminal database, etc.) shall be kept updated in centralized server as specified. (d) Periodic testing of redundant systems shall be carried out. Checksums shall be verified during periodic inspections. (e) Additional References for Electronic Interlocking. (i) Relevant International Standards (or equivalent standards) with latest revisions are also applicable to development and implementation of safety related railway signalling systems and projects including Electronic Interlocking. IEC stands for “International Electro technical Commission” and CENELEC stands for “European Committee for Electro technical Standardization”. (ii) RDSO Specifications and Technical Advisory Notes (TAN) with latest amendments are applicable for design, installation, testing and maintenance of Electronic System. Section 7: Lightning & Surge Protection for Signalling Equipments 21.7.1 Lightning-General: Lightning and surge protection shall be provided to protect Electrical & electronic signalling equipments from lightning & surges. (a) S&T equipment shall be protected as per National Building Code 2016 (NBC 2016) and IEC 62305. S&T equipment, including those given below, are to be grounded and protected from lightning surges. Code of Practices, Technical Advisory Notes, Guidelines issued by RDSO on the subject shall be taken into consideration. (i) Electronic Interlocking Installations including Object Controllers. (ii) BPAC Systems, Axle Counter Systems, Integrated Power Supply Systems. (b) Equi-potential bonding to be provided for all the equipment for effective lightning and surge protection in Signal Equipment Rooms. (c) External Lightning Protection and Class/Type I, II & III devices are to be provided at Chapter 21: Relay & Electronic Interlocking Page 462 of 530