Technical Advisory Note on Electronic Interlocking

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Questions and Answers

What is the preferred method for housing the panel processor?

In an outdoor weatherproof case

In a remote housing unit

In a separate electrical control panel

Inside the control cum indication panel (CCIP) (correct)

Which type of cable is advised for connectivity to ensure damage protection from surges and lightning?

Optical fiber cable (OFC) (correct)

Twisted pair cable

Shielded cable

Coaxial cable

What operating temperature range should the industrial-grade optical modem maintain?

0 to 70°C (correct)

-10 to 50°C

20 to 80°C

0 to 100°C

What is required to ensure that earth resistance at the equipment is less than 1 ohm?

Earthing arrangement must cover most parts of the building Signup and view all the answers

What type of surge protection device (SPD) should be ensured for power supplies of Electronic Interlocking systems?

Relevant SPD Signup and view all the answers

What must be done to ensure the proper function of Surge Protection Devices (SPDs)?

Ensure proper earthing connections are made. Signup and view all the answers

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

1.0 volt Signup and view all the answers

What is the composition of the buried earth conductor mentioned in the guidelines?

Copper or GI type to prevent theft Signup and view all the answers

How should the DC-DC converters for the Electronic Interlocking system be configured?

In N+1 configuration Signup and view all the answers

Where should the DC-DC converter be installed to avoid line drop issues?

Near the EI rack or within the EI rack Signup and view all the answers

When should the Data Logger be commissioned in relation to the EI system?

Before commissioning of the EI system Signup and view all the answers

What type of supply should the VDU monitor receive?

230V AC supply through a separate inverter Signup and view all the answers

What should be the isolation requirement for the supply feeding the fans?

They must be completely isolated from the Electronic Interlocking supply Signup and view all the answers

How should the wires supplying 110V DC power be treated in relation to other cables in the Electronic Interlocking room?

They should not run across other cables and be treated as dirty cable Signup and view all the answers

What kind of arrangement is suggested for the VDU PC/Panel processor module power supply?

Duplicated cable arrangement Signup and view all the answers

Which of the following statements is true regarding the placement of the DC-DC converter?

It should be located to minimize voltage drop Signup and view all the answers

What is the minimum level at which the synchronization of the EI clock and data logger clock must be verified and certified?

Assistant Officers Signup and view all the answers

Which practice is recommended to minimize EMI and EMC effects for the EI input and output cables?

Twist the cables together Signup and view all the answers

What should be marked on the fuse terminals according to the wiring practice?

Fuse number and rating Signup and view all the answers

What must be separated from the internal power supply in the relay room?

110V DC power supply Signup and view all the answers

During commissioning, which type of system should be planned according to the Railway Board's guidelines to avoid failures?

Hot standby system Signup and view all the answers

Who should verify the Factory Acceptance Test (FAT) according to the miscellaneous guidelines?

Railway official (Open line/Construction) Signup and view all the answers

What is a crucial requirement for input and output details before commissioning, according to the guidelines?

Verification by a JAG officer Signup and view all the answers

Where should voltage monitoring cables be routed?

In a separate trough without internal power supplies Signup and view all the answers

Study Notes

Technical Advisory Note for Electronic Interlocking Installation

This document supersedes a previous version (STS/E/TAN/3012, Ver. 2.0 dated 10.08.2016).
It details guidelines for technical system application approval for electronic interlocking installations.
The guidelines were developed based on analysis of TSAA documents from RDSO over the past 5 years.
Railways should follow these guidelines for speedy TSAA clearance from RDSO.

Power Supply Arrangement

110V DC supply: Duplicate cabling from the IPS room to the El rack is required to prevent voltage drop exceeding 1.0 volt.
- This redundancy is for system robustness and to avoid cable damage from rats or other issues.
- Using appropriate wire gauge and quality is also important.
DC-DC Converters: Converters must be segregated for 'A' & 'B' systems, with separate cabling and termination.
- N+1 configuration is recommended for redundancy.
- Using reliable DC-DC converters from OEMs is advised.
DC-DC Converter Placement: Install DC-DC converters near the El rack to avoid line voltage drops exceeding 0.5 volts. This is for better operation stability.
Cable Segregation: 110V DC cables should be completely separated from other cables to avoid induced surges.

Electronic Equipment Room

VDU/Panel Processor Power Supply: 110V DC supply for these components sourced from either the El room or IPS room using duplicated cables and appropriate DC-DC converters.
Fan Power Supply: Separate, isolated 24V or 110V DC power supply for fans to avoid issues caused by inductive loading on the DC-DC supply of main equipment.
230V AC Supply: Separate inverter for 230V AC supply for VDU Monitors with 24VDC input and an AC output with pure sine wave.

Communication Arrangement

Panel Processor Placement: Inside the control cum indication panel (CCIP) is preferable.
- OFC cables are suggested for redundancy.
Communication Cables: El to VDU, CPU to CPU, etc. should be connected using OFC cables to prevent damage and improve reliability (distributed system).
Analog Monitoring: DC-DC converter output monitoring via the data-logger for preventive maintenance.

Earthing Arrangement

Class A protection is recommended on building rooftops.
Copper tape bonding should encompass relay, power and equipment rooms.
Relay racks and El racks should be interlinked.
Cable troughs and ladders must be properly earthed.
Proper SPD (Surge Protection Device) provisions are necessary to ensure proper functioning.
Cabinets should have copper braided grounding to the bus bar.

Data Logger Installation

Data Logger needs to be commissioned before the El system.
All external relay contacts should be wired to the data logger.
Synchronization between the Data Logger and the El clock through CMU is essential.
Analog monitoring of DC-DC converter output is part of the data logger setup for preventive maintenance.

Wiring Practice

Input, output, data, and power supply cables should be routed separately with at least 6–8 inches space between cables in cable troughs.
Twisted input and output cables are needed to reduce EMI/EMC effects.
Proper rating and marking of fuses is crucial.
Surge and lightning protection devices should be installed.
Wire connections should be properly crimped.
Separate troughs or ladders are necessary to segregate 110V DC from lower-voltage (12V/24V/50V DC) power cables.
Voltage monitoring cables should be in separate troughs from other cables to prevent surges from entering the voltage monitoring system.

Additional Notes

Document verification by JAG Officer and Railway Officials is required before commissioning.
Technical system application approval documents must be reviewed and signed by authorized Railway official or commissioning company.
A precommissioning checklist is required to be completed jointly with the equipment manufacturer (OEM).
OEMs are responsible for quality control, and any installation issues pointed after commissioning must be resolved free of cost by the OEM.

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Description

This quiz covers the technical guidelines for electronic interlocking installations, focusing on power supply arrangements and system redundancies. It is essential for railway systems to comply with these guidelines for swift TSAA clearance from RDSO. Understanding these standards can help enhance the reliability and safety of electronic interlocking systems.