Electronic Interlocking Systems Quiz

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Questions and Answers

What is the maximum allowable voltage drop in the cable from the integrated power supply to the Electronic Interlocking rack?

1.0 volt

In the context of Electronic Interlocking, how should the DC-DC converters be configured?

They should be in N+1 configuration and segregated for 'A' & 'B' systems.

What is the maximum line drop permitted for the DC-DC converter installed near the EI rack?

0.5 volt

How should the cables for the 110V DC power supply be managed in relation to other wiring in the Electronic Interlocking room?

They should be segregated from other clean wiring and treated as dirty cable. Signup and view all the answers

What type of configuration should be used for the DC-DC converter that provides power for VDU PC/Panel processor modules in the SM room?

It should have a duplicated cable arrangement in N+1 configuration. Signup and view all the answers

What is the significance of isolating the 24V or 110V DC supply for the fan from the Electronic Interlocking supply?

It prevents interference and enhances the reliability of the Electronic Interlocking system. Signup and view all the answers

What type of inverter is specified for providing the 230V AC supply for the VDU monitor?

A pure sine wave inverter with 24V DC nominal input and redundant arrangement. Signup and view all the answers

What should be done with the inverter's 230V AC input cable?

It should be unplugged. Signup and view all the answers

What is the preferred housing for the panel processor in the EI system?

The panel processor shall preferably be housed inside the control cum indication panel (CCIP). Signup and view all the answers

How should the connectivity between the EI and other components like VDU and CPU be planned?

Connectivity should be planned using optical fiber cables (OFC) in a redundant manner. Signup and view all the answers

What temperature range must the optical modem operate within?

The optical modem must operate within a temperature range of 0 to 70 degrees Celsius. Signup and view all the answers

What is the purpose of using a ring system for communication lines in a distributed system?

Using a ring system provides redundancy to avoid failure due to loss of communication. Signup and view all the answers

What should be ensured to maintain earth resistance at the equipment?

Earth resistance shall be ensured to be less than 1 ohm at the equipment. Signup and view all the answers

What type of conductor should be used for buried earthing to prevent theft?

The buried earth conductor can be of Galvanized Iron (GI) type to avoid theft. Signup and view all the answers

Why is proper earthing important for Surge Protection Devices (SPDs) in EI systems?

Proper earthing is crucial as missing connections can render the SPDs functionless. Signup and view all the answers

When should the data logger be commissioned in relation to the EI system?

The data logger shall be commissioned prior to the commissioning of the EI system. Signup and view all the answers

What is the minimum officer level required to verify and certify the synchronization of EI clock and data logger clock?

Assistant officer level Signup and view all the answers

What gap is recommended between different cable troughs for routing input, output, data, and power supply cables?

6 to 8 inches Signup and view all the answers

Why should the input and output cables of EI be twisted?

To minimize EMI & EMC effect Signup and view all the answers

What is the minimum officer level required to scrutinize and verify input and output details before commissioning?

JAG officer level Signup and view all the answers

What type of devices should be installed according to the electronic interlocking installation document?

Lightning and surge protection devices Signup and view all the answers

What type of system should be planned for commissioning to avoid failures due to resets?

Hot standby system Signup and view all the answers

What should be done with voltage monitoring cables to ensure proper installation?

Placed in a different trough without internal power supplies Signup and view all the answers

What is the purpose of the Factory Acceptance Test (FAT) during the installation process?

To verify the system by Railway officials before site acceptance testing. Signup and view all the answers

Study Notes

Technical Advisory Note - Electronic Interlocking Installation

This document supersedes a previous version, dated 10.08.2016.
It provides guidelines for installing Electronic Interlocking (EI) systems.
The guidelines are based on analysis of Technical System Application Approval (TSAA) documents from RDSO over five years.
The guidelines aim to expedite TSAA clearance from RDSO and boost EI installation reliability.

Power Supply Arrangement

Duplicate cables: 110V DC supply from the IPS room to the El rack should use duplicated cables of appropriate gauge to prevent voltage drops exceeding 1 volt.
- This redundancy combats potential issues like rat bites or damage.
DC-DC converters: DC-DC converters for the EI system should be segregated (A & B) with separate cabling and termination.
- They should be in an N+1 configuration.
- Reliable converters as advised by OEMs are recommended. The required sketches are in Annexure A1 & A2.
- This redundancy helps maintain system availability if one converter fails.
- The converters should be placed near the rack to minimize voltage drop (no more than 0.5 volts).
External power supply for fans: 24V or 110V DC fan power should be sourced from a separate, external isolated power supply with fuses.
- This is to avoid issues caused by inductive loads on the main EI equipment's power supply and protects against fan short circuits.
230V AC power supply: Use a separate inverter (230V AC output, 24V DC, pure sine wave with SPD) for the VDU monitor to avoid lightning impacts.
- Unplug the 230V AC input cable from the inverter.

Communication Arrangement

Panel processor location: The panel processor should be housed within the control cum indication panel (CCIP).
- Use optical fiber cable (OFC) for connections to avoid damage from cutting and lightning.
- This space-saving configuration enhances reliability.
High reliability communication: Using OFC for connections between various components (El to VDU, CPU-to-CPU, El to Object Controller, El to PPM) enhances survivability to surge and lightning, ensuring stability and availability.
- This strategy also uses a ring system to prevent network failures.
- Network Management System (NMS) for the OFC and other networks are recommended.

Earthing Arrangement

Class A Protection: Ensure class A lightning protection measures on the building's top.
Copper Tape: Use bonding ring conductors on insulated stand-offs to cover relay rooms; ensure short paths to earth.
Earth Resistance: Ensure earth resistance is less than 1 Ohm for equipment. This is to minimize any potential damage during surges.
Proper Earthing: Ensure the buried earth conductor, preferably copper, is also electrically connected through all relay racks and cabinet enclosures, including front and back doors.
- Using copper braids is recommended in this case.
SPD Provisions: Ensure surge protection devices (SPDs) for electronic interlocking devices and ensure proper earth connections for all cabinets.

Data Logger Installation

Commissioning: Commission the data logger before the El system. Wire all external relay contacts to the data logger.
Synchronization: Verify synchronization between the El clock and the data logger clock through CMU.
Analog Monitor: Wire the DC-DC converter output data to the data logger for health monitoring. This enhances preventive and predictive maintenance.

Wiring Practices

Cable Routing: Route input, output, data, and power cables in separate cable troughs to maintain electrical separation and avoid interference.
Twisted Pairs: Twist input and output cables to minimize electromagnetic interference.
Fuse Terminals: Appropriately label fuse terminals with ratings and numbers.
Surge Protection: Install surge protection devices as per the outlined documents.
Wire Connections: Ensure proper crimping and secure connections at wire ends. Maintain a 6-8 inch separation for cables in cable trays to prevent mutual induction.
110V/ External DC separation: Separate 110V AC external power lines from 12V/24V/50V DC internal power lines to prevent surges from damaging equipment. This also applies to voltage monitoring lines, including those of the data logger.

Other Requirements and Processes

JAG Officer Involvement JAG officers must verify input and output details and logic during commissioning, and their involvement should then be recorded with certificates submitted to RDSO.
Factory and Site Acceptance Tests: Factory and site acceptance tests, including sample verifications, should be done by railway officials and JAG officials for improved reliability.
Embedded VDU guidelines: Adhere to guidelines for embedded VDU specification from a previous Technical Advisory Note (Document STS/E/TAN/3007).
OEM Responsibilities: OEMs must guarantee the quality and integrity of the Electronic interlocking installation, cover any discovered deficiencies post-installation, and provide the necessary certification before commissioning.
Commissioning Checklist: Execute the pre-commissioning check-list, involving Assistant officers at the site level and the executing OEM.

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Description

Test your knowledge on Electronic Interlocking systems, focusing on power supply configurations, voltage drops, and wiring management. This quiz covers essential aspects such as DC-DC converters and the setup for electronic components in the Electronic Interlocking room.