Electronic Interlocking Power Supply Quiz

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Questions and Answers

Where should Factory Acceptance Testing (FAT) preferably be conducted?

At railway premises

At factory premises (correct)

At the site of installation

At a temporary location

What is the maximum allowable voltage loss in the wires connecting equipment for E.I systems?

2.5%

5.0%

0.5% (correct)

1.0%

Which of the following responsibilities belongs to the SSE/JE (Signal)?

Testing all electrical signalling circuits of relay interlocking up to 20 routes (correct)

Conducting insulation tests on cables

Overseeing modifications in electrical systems

Conducting system integrity tests every three years

What should the power supply for fans in Electronic Interlocking systems include?

A separate external supply isolated from Electronic interlocking supply Signup and view all the answers

How often should physical inspections of existing installations be conducted?

Once a year or earlier as feasible Signup and view all the answers

What is required for Lightning and Surge protection as per the guidelines?

It should follow Section 7 of the current chapter Signup and view all the answers

How frequently should a system integrity test be conducted on a working installation?

Once in five years or earlier if altered Signup and view all the answers

Who is responsible for testing electrical signalling circuits of relay interlocking with more than 20 routes?

ASTE/DSTE concerned Signup and view all the answers

What is the purpose of maintaining the Electronic Interlocking system according to the approved manuals?

To maintain safety and reliability Signup and view all the answers

Where must the Maintenance Terminal for the Electronic Interlocking system be located?

In the Signal Technician Duty room Signup and view all the answers

What should be done with the latest E.I station database files?

They must be kept updated in a centralized server Signup and view all the answers

Periodic testing of redundant systems involves which of the following?

Verifying checksums during inspections Signup and view all the answers

Which international standards are applicable to Electronic Interlocking systems?

IEC and CENELEC standards Signup and view all the answers

What is emphasized regarding lightning protection for signaling equipment?

Grounding and surge protection must meet established codes Signup and view all the answers

What is specified as a requirement for S&T equipment concerning lightning protection?

To be grounded according to National Building Code Signup and view all the answers

Which systems are included for protection against lightning surges?

Electronic Interlocking Installations and BPAC Systems Signup and view all the answers

Study Notes

Power Supply for Electronic Interlocking

Adequate redundancy in power supply for E.I systems, including control terminals, is needed, following approved specifications and guidelines.
Wires connecting equipment must be sized to avoid more than 0.5% voltage loss.
Separate external power supply for fans, fully isolated from the Electronic interlocking supply, with fuses, is required.

Lightning & Surge Protection and Earthing

Lightning and surge protection, and earthing, must be performed according to Section 7 of the relevant chapter.

Testing & Commissioning of Electronic Interlocking

Wiring, testing, and commissioning follow Paragraphs 19.8.5 to 19.8.12.
A recommended checklist (Annexure 21-A2), subject to modification, is also available.

Maintenance of Interlocking (Existing Installations)

All tests in the chapter should be conducted at the time of new installation or altering existing installations.
- Periodic physical inspections are needed annually or sooner, if possible.
- System integrity tests are to be performed every 5 years or sooner if the interlocking is altered, following paragraph 19.8.8.
- Cable insulation tests are to be performed per Chapter 15 of the relevant standards manual.
- Each piece of equipment is to be tested following specifications in current standards.
- Electrical signalling circuits are to be tested by assigned personnel:
  - SSE/JE (Signal) is responsible for up to 20 routes.
  - ASTE/DSTE is responsible for more than 20 routes.

Specific Tests for Electronic Interlocking

Maintenance is to be performed per approved maintenance manuals, with Annexure 21-MS3 in Appendix I providing a general schedule for guidance.
- More frequent inspections can be implemented at high-traffic/high-speed stations as deemed necessary.
Maintenance terminals for Electronic Interlocking systems are to be provided in the Signal Technician Duty room.
Latest Electronic Interlocking station database files (application logic, control terminal database, etc.) should be kept updated in a centralized server, per specifications.
Redundant systems should regularly be tested, with checksum verification during periodic inspections.
Applicable International Standards, with recent revisions, are useful for development, and implementation of safety-related railway signalling systems.
RDSO specifications and Technical Advisory Notes (TAN), with recent amendments, apply to the design, installation, testing, and maintenance of the Electronic system.
- Relevant International Standards, and RDSO Specifications are applicable for development, and implementation of safety-related railway signalling systems.

Lightning and Surge Protection for Signalling Equipment

Electrical and electronic signalling equipment must be protected against lightning and surges, using National Building Code 2016 (NBC 2016) and IEC 62305 standards.
- Grounding and surge protection for specific equipment, including electronic interlocking installations, BPAC systems, axle counter systems, and integrated power supply systems, is required.
Equi-potential bonding should be applied to equipment for effective lightning/surge protection in signal equipment rooms.
Installation of proper external lightning protection devices (Class/Type I, II, III) is required.

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Description

Test your knowledge on the power supply requirements and maintenance of electronic interlocking systems. This quiz covers crucial aspects such as redundancy, surge protection, testing, and commissioning as outlined in relevant guidelines. Ensure you're well-versed in the specific needs for effective interlocking functionality.