Electronic Interlocking Systems Overview
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Questions and Answers

What type of cable is planned for connectivity between the E.I and sub-systems to prevent damage from surge and lightning?

  • Coaxial cable
  • Copper wire
  • Optical fiber cable (correct)
  • Twisted pair cable

What is the primary purpose of the Factory Acceptance Test (FAT) for Electronic Interlocking?

  • Simulating operational scenarios to ensure software functionality (correct)
  • Conducting real-time equipment functional testing
  • Testing installed hardware at the site
  • Verifying cross table with physical hardware

During the Site Acceptance Test (SAT), which of the following tests is NOT performed?

  • Logic and interlocking testing
  • Control Table testing
  • Cross Table testing
  • Software installation testing (correct)

Which of the following tests is specifically included during FAT for Electronic Interlocking?

<p>Control Table testing (D)</p> Signup and view all the answers

What kind of testing is emphasized during the SAT for a new installation?

<p>Interface and equipment functional testing (A)</p> Signup and view all the answers

In SAT for alteration works, which condition allows certain tests to be skipped?

<p>If the existing ports are not disturbed (D)</p> Signup and view all the answers

Which type of testing is included in the SAT process following the interface with field gears?

<p>Intercommunication testing (B)</p> Signup and view all the answers

What distinguishes the tests performed during FAT from those performed during SAT?

<p>FAT is primarily software testing without hardware interaction (A)</p> Signup and view all the answers

What must happen whenever modifications are carried out to the Application logic?

<p>The version number and Checksum shall change. (A)</p> Signup and view all the answers

Who is responsible for approving the version and checksum of the Application logic?

<p>Competent authority for circuit diagrams (A)</p> Signup and view all the answers

What is required for maintaining the Checksum records?

<p>At Station, Divisional Headquarters, and Zonal Headquarters (B)</p> Signup and view all the answers

What type of cabinets should the Electronic Interlocking system be installed in?

<p>Dust proof cabinets of approved type (A)</p> Signup and view all the answers

What should be done to reduce EMI and EMC effects in the Electronic Interlocking system?

<p>Twist the input and output cables. (B)</p> Signup and view all the answers

What is a necessary condition for the Application logic used in the Electronic Interlocking system?

<p>It must have a specified checksum and be approved. (C)</p> Signup and view all the answers

Which of the following is not a guideline for installing the Electronic Interlocking system?

<p>Use any type of interface relays. (B)</p> Signup and view all the answers

Who should verify the safety and functionality of Application logic?

<p>PCSTE authorized officers (A)</p> Signup and view all the answers

What type of flooring is recommended for the Electronic Interlocking room?

<p>Tiles or similar arrangements (C)</p> Signup and view all the answers

Which type of ladders should be used for carrying wires in the Electronic Interlocking room?

<p>FRP or insulated ladders (C)</p> Signup and view all the answers

How should entries to the Electronic Interlocking room be treated?

<p>They must be sealed to prevent pests. (C)</p> Signup and view all the answers

What is required near electronic equipment to prevent electrostatic damage?

<p>Electrostatic Floor Pads and Hand bands (B)</p> Signup and view all the answers

What environmental control is essential in the room where Electronic Interlocking is installed?

<p>Air-conditioning (C)</p> Signup and view all the answers

What is the minimum distance that should be maintained between clean and dirty wiring?

<p>150 mm (B)</p> Signup and view all the answers

How should clean and dirty wiring be routed when segregation is not feasible?

<p>They should cross at angles. (B)</p> Signup and view all the answers

What class of devices is required for surge protection for external interface ports?

<p>Indicative type of appropriate class and rating (C)</p> Signup and view all the answers

What test is specifically mentioned for checking new additions to the system?

<p>Correspondence test (C)</p> Signup and view all the answers

What is the maximum allowable voltage loss for wires connecting equipment in Electronic Interlocking systems?

<p>0.5% (A)</p> Signup and view all the answers

Where should the Factory Acceptance Test (FAT) preferably be conducted?

<p>At factory premises (A)</p> Signup and view all the answers

Which of the following is a requirement for the power supply arrangements in E.I systems?

<p>Adequate redundancy (C)</p> Signup and view all the answers

Who should preferably conduct the FAT and SAT?

<p>Separate officials (D)</p> Signup and view all the answers

What kind of external supply should power the fan in Electronic Interlocking?

<p>Completely isolated from E.I supply (B)</p> Signup and view all the answers

What should be tested when existing I/O and communication ports are disturbed?

<p>I/O port correspondence check (D)</p> Signup and view all the answers

What should the periodicity of tests be for existing installations of Electronic Interlocking?

<p>At the time of alterations or new installations (D)</p> Signup and view all the answers

Flashcards

Software Version Control

Managing changes and versions of software for electronic interlocking systems.

Application Logic Version

Unique version number for each installation's station-specific software logic.

Checksum Approval

Validating the integrity of application logic through unique checksums.

Checksum Modifications

Checksums change after any alterations to the application logic.

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Installation Guidelines

Following approved procedures for installing electronic interlocking systems.

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Safety and Functionality Tests

Thorough testing of the application logic for proper operation and safety.

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Approved Application Logic

Using only approved station-specific software with correct checksums.

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Dust Proof Cabinets

Electronic interlocking should be kept in approved-type dust-proof cabinets with clear fronts.

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Interlocking Room Flooring

The Electronic Interlocking room should have floor tiles or similar arrangements to prevent dust from painting.

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Wire Routing

Use FRP or insulated ladders for wire management between equipment racks or other devices.

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Rodent and Insect Control

All entries to the Electronic Interlocking room should be sealed to prevent pests from entering.

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Electrostatic Discharge Protection

Provide electrostatic floor pads and hand bands near electronic equipment to prevent damage from static electricity.

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Air Conditioning Requirements

The room housing the Electronic Interlocking system needs to be air-conditioned.

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Lightning Protection

The Electronic Interlocking room building must have external lightning protection. If a nearby structure already protects it, additional protection is not required.

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Power Line Protection

Install surge and lightning protection devices on regulated power lines before connecting them to the Electronic Equipment Room.

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Clean and Dirty Wiring Separation

Keep clean and dirty wiring separate in different enclosures or maintain a minimum distance of 150mm between them.

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Factory Acceptance Test (FAT)

Testing the integrity of electronic interlocking logic in a factory setting using a computer simulation. This test is conducted before installation and involves testing the software with reduced timings, ensuring that the logic works as intended.

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Site Acceptance Test (SAT)

Testing the electronic interlocking system installed at the actual location after connecting all wiring and equipment. This test involves both logic testing and interface testing, verifying the system's functionality with real-world equipment.

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Control Table Testing

Testing the logic of the control system, ensuring that it correctly controls train movements and prevents conflicts. Includes 'negative testing', verifying that the system functions correctly even when unexpected conditions arise.

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Cross Table Testing (Square Sheet Testing)

Testing the interactions between different parts of the interlocking system, ensuring that they work together correctly. This involves verifying that the system handles all possible scenarios.

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Intercommunication Test

Testing the communication between different parts of the electronic interlocking system, ensuring that they can exchange information correctly.

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Correspondence Test

Testing the connection between the electronic interlocking system and the actual field equipment, like signals and points, to ensure proper communication and control.

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Redundant OFC Cable

Using multiple optical fiber cables (OFC) to connect components in the electronic interlocking system. This ensures that if one cable fails, the system still has a backup path for communication.

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Testing for Alteration Works

If changes are made to the electronic interlocking system (e.g., adding new equipment), only specific parts of the system need testing in SAT. This ensures that the alterations do not impact the functionality of the existing system.

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FAT (Factory Acceptance Test)

A comprehensive test conducted at the factory to ensure the electronic interlocking system meets specifications before installation.

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SAT (Site Acceptance Test)

A test conducted at the railway site after installation to verify the system's functionality and integration with existing infrastructure.

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Redundant Power Supply

Having backup power systems for electronic interlocking to ensure uninterrupted operation in case of failure.

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Voltage Loss in Wiring

The maximum allowable voltage drop in wiring connected to electronic interlocking equipment is 0.5%.

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Fan Power Isolation

Power supply for fans in the electronic interlocking room should be separate and isolated from the interlocking system's power.

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Lightning & Surge Protection

Implementing measures to protect electronic interlocking equipment from lightning strikes and voltage surges.

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Study Notes

Version Control of Electronic Interlocking Software and Hardware

  • Approved versions of the generic system software and hardware are controlled by competent authorities.
  • Application logic (station-specific) versions and checksums are unique per installation and approved by the circuit diagram approving authority.
  • Checksums are recorded and controlled.
  • Version numbers and checksums change with any application logic modifications.
  • Proper checksum records are kept at station, divisional, and zonal headquarters.

Installation of Electronic Interlocking

  • Installation follows approved guidelines and technical advisories.
  • Application logic safety and functionality are verified through exhaustive tests performed by authorized personnel.
  • Only approved application logic with checksums is used.
  • Railways maintain and control the approved checksums.
  • Interlocking systems are housed in approved dustproof cabinets with transparent doors.
  • Interface relays are paralleled for increased reliability.
  • Spare input/output cables are wired to Wago terminals for future adjustments.
  • Input/output cables are twisted for minimized EMI and EMC.
  • Electronic Interlocking should be placed close to the operator's room.
  • Direct track crossings between the E.I room and the main system should be avoided.
  • The E.I room floor and walls are tiled/similar material to prevent painting related dust.

Electronic Interlocking Room

  • FRP or insulated ladders are used for wiring.
  • Room entries are sealed to prevent entry of pests.
  • Electrostatic floor pads and hand bands are used near the equipment to prevent electrostatic discharges.
  • Air conditioning is required in the E.I room.

Building/Room Protection

  • External lightning protection is at the top of buildings.
  • If another metal structure provides protection, Class A protection isn't needed, but building guidelines are followed.
  • Surge and lightning protection is provided to power lines in an Electronic Equipment Room.
  • Separate power supply lines are used for the Electronic Equipment Room.
  • Clean and dirty wires are kept separate, with a 150mm minimum distance.
  • Clean and dirty wires crossing must be perpendicular.
  • Surge protection is in place for all copper-based interfaces.
  • Communications are via Optical Fiber Cable (OFC) for redundancy.

Testing of Electronic Interlocking

  • Factory Acceptance Test (FAT): Uses computer simulation to verify interlocking application software.
  • Testing does not include interface checks as hardware is not present and only reduced time application software interaction is checked.
  • Site Acceptance Test (SAT): Site testing with hardware and a simulation panel, including interface verification (after connecting to field gears)
  • Tests can differ for new installations vs site alterations.
  • Different tests include checking logic, interlocking, interface equipment functionality, cross tables, control tables, and intercommunication between sub-racks/correspondence.

Power Supply

  • Redundancy in power supply and controls is required following specifications.
  • Wires should limit voltage loss to 0.5%.
  • Separate power supplies are required for fans, isolated from the E.I system's power supply.
  • Fuses are required.

Lightning and Surge Protection and Earthing

  • Rules around lightning and surge protection and earthing are included in a dedicated section.
  • Wiring, testing, and commissioning are aligned with section 19.8.

Maintenance

  • Periodic tests for existing installations (relay/electronic interlocking):
  • Physical inspection (annual/as needed)
  • System integrity (every 5 years/when alterations happen)
  • Insulation testing on cables
  • Apparatus testing in aligned with specifications.
  • Electrical signal circuits will be tested by signal staff for installations with up to 20 routes / more than 20 routes respectively.

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CH 21 Section 5 PDF

Description

This quiz covers key aspects of version control and installation procedures for electronic interlocking software and hardware systems. It highlights the importance of maintaining approved versions, checksums, and installation guidelines to ensure safety and functionality. Test your knowledge on the regulations and practices that govern these systems in the railway sector.

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