CH 21 Section 5 PDF

21.4.7 Version Control of Softwares of Electronic Interlocking (a) Version of the Generic System software and hardware shall be approved and controlled by authority competent to approve the Electronic Interlocking system and its specifications. (b) Version and c...

21.4.7 Version Control of Softwares of Electronic Interlocking (a) Version of the Generic System software and hardware shall be approved and controlled by authority competent to approve the Electronic Interlocking system and its specifications. (b) Version and checksum of the Application logic (station specific logic) shall be unique for the installation and shall be approved by the authority competent to approve the circuit diagrams. Corresponding Checksum shall be recorded and controlled by the same authority. (c) Version number and Checksum shall change whenever any modifications are carried out to the Application logic (site specific logic). (d) A proper record of Checksums shall be maintained at Station, Divisional Headquarters and Zonal Headquarters as a part of completion circuit diagrams. Section 5: Installation & Testing of Electronic Interlocking 21.5.1 Installation of Electronic Interlocking (a) Installation of Electronic Interlocking system shall be done as per approved guidelines and technical advisory notes issued from time to time. (b) Application logic (site specific logic) shall be verified for safety and functionality by carrying out exhaustive safety and functionality tests by officers authorized by PCSTE. (c) Only approved application logic with specified checksum shall be used in the E.I system and this data and checksum shall be version controlled and preserved by the Railways. (d) Electronic Interlocking is required to be provided in dust proof cabinets of approved type having transparent front door. (e) Interface Relays, where provided, shall be of approved type and contacts should be paralleled as far as possible for better reliability. (f) Wherever possible, the spare input/outputs shall also be wired from E.I cards up to Wago terminals for ease of carrying out future alterations. (g) The input and output cables of E.I shall be twisted to minimize EMI & EMC effect. (h) Electronic Interlocking system shall be installed closer to Operator Room, preferably adjacent room. Track crossing should be avoided between main E.I system and operator room. (i) The Electronic Interlocking room shall be provided with tiles or similar arrangements on floor and walls to avoid periodic painting of walls and resultant dust. Chapter 21: Relay & Electronic Interlocking Page 458 of 530  (j) FRP or insulated ladders arrangement shall be used to carry wires from rack to rack or from other equipment. (k) All entries to Electronic Interlocking room shall be suitably sealed to prevent entry of rodents, lizards, insects etc. (l) Electrostatic Floor Pads and Hand bands shall be provided near electronic equipment to prevent damages to electronic equipment due to electrostatic discharges. (m) The room where Electronic Interlocking is installed shall be provided with Air-conditioning. (n) The building/room where E.I is installed shall be protected by External Lightning protection arrangement at the top of building. In case there is any other metallic earthed structure is available nearby which protects the E.I building, then separate Class A at top of E.I room is not required. The guidelines in National Building Code of India (2016 or latest) shall be followed for calculations. (o) Surge and lightning protection devices of appropriate class and rating shall be provided for the regulated power lines before extending them to Electronic Equipment Room. All equipment in Electronic Equipment Room shall derive power from these regulated and protected power lines (clean), but not from electrical service lines (dirty) used for room lighting air- conditioning or fans. (p) Clean and dirty wiring shall be clearly segregated and routed in different enclosures/ladders, and where this is not feasible, a minimum distance of 150 mm between clean and dirty wiring shall be maintained. (q) If clean and dirty wiring need to cross at any place, then wiring should be arranged at perpendicular to each other. (r) Indicative type surge protection devices of appropriate class and rating shall be installed for all copper based external interface ports (power, communication, maintenance terminal, control panel interface etc). (s) The connectivity between E.I and sub-systems like Control Terminal, Control Panel, and Object Controller shall be planned with OFC cable to avoid damage due to surge and lightning. The OFC shall be provided in redundant manner to avoid failure due to cut/damage in one location/path. 21.5.2 Testing Of Electronic Interlocking (a) For Electronic Interlocking, the integrity of interlocking inside E.I designed for a specific station can be tested at factory which is termed as Factory Acceptance Test (FAT). This interlocking when installed at site and interface wiring is connected then the test carried out as laid down for relay interlocking, it is termed as Site Acceptance Test (SAT). Chapter 21: Relay & Electronic Interlocking Page 459 of 530 (b) Tests to be performed during FAT: FAT testing is performed with the computer simulation. Only the testing of interlocking on Application Software with reduced time as per SIP and RCC is performed during this stage. Interface with I/O card, intercommunication is not checked as E.I hardware is not used in FAT. Hence, the following test are to be usually done during FAT (Computer Simulation), besides any other tests as required- (i) Control Table (including Negative Testing). (ii) Cross Table (Also known as Square sheet testing). (c) Tests to be performed in SAT (for new installations): In SAT, similar testing is being performed at site with E.I hardware and simulation panel in first stage. The correspondence & Interface testing are also performed after interface with field gears. Any other test may also be conducted as required. (i) Logic and interlocking testing:  Control Table (including Negative Testing).  Cross Table (Square sheet). (ii) Interface and Equipment functional Test:  Intercommunication test between sub-racks,  Correspondence test (d) Tests to be performed in SAT (for alteration works):- (a) When the existing ports (I/O and communication) are not disturbed, the following tests, besides FAT, and any other tests as required, are to be done; (i) Logic and interlocking testing Control Table to the extent as decided by the Zonal Railway. (ii) Interface and Equipment functional Test:  Correspondence test (new additions)  Intercommunication test between sub-racks (if any new addition) (b) When the existing ports (I/O and communication) are disturbed, the following tests, besides FAT, and any other tests as required, are to be done; (i) I/O port correspondence check between Application logic and Interface circuits. (ii) Logic and interlocking testing Control Table to the extent as decided by the Zonal Railway. (iii) Interface and Equipment functional Test:  Correspondence test (new additions)  Intercommunication test between sub-racks (if any new addition) Chapter 21: Relay & Electronic Interlocking Page 460 of 530  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