LED Signal Lighting Specs for Railways

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Questions and Answers

What is the nominal voltage at which the aspect should be lit for testing according to the measurement procedure?

220 V

110 V (correct)

120 V

240 V

How is the dispersion angle calculated according to the provided measurement procedure?

By averaging the distances of the intensity points at 1.5 m

By measuring the distance from the center to the nearest LED

By calculating the difference between d1 and d2

Using the formula $tan^{-1}(d - r) = Ø / 2$ (correct)

What does 'r' represent in the dispersion angle calculation?

The distance from the center of the unit to the outermost LED (correct)

The distance from the LED signal lighting unit to the test bench

The radius of the lighting unit's illumination area

The average distance between the half intensity points

Where should the measurement for dispersion angle be taken?

At 1.5 meters from the LED signal lighting unit Signup and view all the answers

What is a half intensity point in the context of the dispersion angle measurement?

Where half of the normal illumination at rated voltage falls Signup and view all the answers

Who is the author of the document RDSO/SPN/153/2023 Revision 5.0?

Ajay Verma Signup and view all the answers

What is the primary focus of the document RDSO/SPN/153/2023 Revision 5.0?

Technical specifications for signalling units Signup and view all the answers

Which type of signals are included in the technical specifications outlined in the document?

Route, Calling-on, Shunt, and Tunnel Signals Signup and view all the answers

What is the effective date of the specification RDSO/SPN/153/2023 Revision 5.0?

01/04/2023 Signup and view all the answers

Who approved the document RDSO/SPN/153/2023 Revision 5.0?

Rajendra Dhambel Signup and view all the answers

What is the maximum current drawn by an LED Signal Lighting Unit when it fails to meet the illumination criteria?

2 mA Signup and view all the answers

How many route signal lighting units should be wired in parallel for Direction type Route Indicator?

Five Signup and view all the answers

What is the acceptable range for total input current drawn after wiring the signal lighting units?

+5%, -10% Signup and view all the answers

What should the illumination fall below for the Calling ON signal lighting unit to extinguish?

40 Signup and view all the answers

What is the maximum acceptable voltage for signal lighting units to operate?

60 V Signup and view all the answers

What is the dispersion angle for Route signal lighting units measured at 50% power points?

10° ± 2° Signup and view all the answers

What is the condition under which fluctuations in input voltage should not result in a failure mode?

Fluctuation must stay under specified limits Signup and view all the answers

What illumination angle is specified for shunt signal lighting units?

15° ± 2° Signup and view all the answers

What is the required rated voltage at input for all types of LED signal lighting units?

110V± 20% Signup and view all the answers

Which aspect has its colour coordinates defined as Class 'C' of BS: 1376?

Red Aspect Signup and view all the answers

What is the current at rated voltage for a Shunt Lighting Unit?

55 mA Signup and view all the answers

What is the illumination level measured at 1.5 m from an LED Signal Lighting Unit for a Route Lighting Unit?

50 LUX Signup and view all the answers

Which LED signal lighting unit has a specified yellow colour?

C-ON Signal Signup and view all the answers

What tolerance is given for the illumination measurement at rated voltage for a Shunt Lighting Unit?

-10% +40% Signup and view all the answers

What are the operating parameters of LED signal lighting units dependent on?

Type of relay used Signup and view all the answers

Which of the following aspects has specified illumination of 30 LUX?

Shunt Lighting Unit Signup and view all the answers

What percentage of samples from a lot are subjected to tests during the acceptance test phase?

20% Signup and view all the answers

Which test is NOT mentioned as part of the minimum requirements for the acceptance tests?

Failure analysis Signup and view all the answers

What is the requirement for fail safety for subsequent maintenance approvals?

Fail safety is not required if circuit design remains unchanged Signup and view all the answers

What is the first test to be conducted after ambient temperature testing?

Compatibility with ECR Signup and view all the answers

Which clause defines the requirement for the dispersion angle test?

6.1.8 Signup and view all the answers

What is the rated voltage at input terminals for the LED lighting units used in tunnels?

110V ± 20% AC (rms), 50Hz Signup and view all the answers

What is the purpose of conducting a visual inspection and dimensional check during the acceptance test?

To ensure the correct physical dimensions and appearance Signup and view all the answers

Which of the following tests is conducted to verify the performance of current regulation in the circuit?

Output current regulation of current regulation circuit Signup and view all the answers

Which aspect is designed to extinguish in case of failure to avoid a double aspect condition?

Green aspect Signup and view all the answers

If a sample fails any of the tests during acceptance testing, what is the outcome?

It is not acceptable Signup and view all the answers

What is the limitation on input current for the LED signal lamp during failure?

≤10 mA Signup and view all the answers

What is the current at rated voltage per unit at input terminals?

140 mA ± 20% (rms) Signup and view all the answers

At what distance is illumination measured for the LED signal lighting unit?

1.5m Signup and view all the answers

What is the expected illumination level from the LED signal lighting unit in axial direction?

80 LUX Signup and view all the answers

What characteristic must the LED signal lamp ensure regarding ECR pick up current?

It should be more than the specified maximum pick up current. Signup and view all the answers

What should happen in the case of an intermittent failure of the lamp?

It maintains the same state until manually reset. Signup and view all the answers

Study Notes

Specification Details

Document Title: Technical Specifications for LED Signal Lighting Units for Subsidiary Colour Light Signals (Route, Shunt, Calling-on and Tunnel Signals) for Railway Signalling
Revision: 5.0
Specification No.: RDSO/SPN/153/2023
Author: Ajay Verma, Executive Director/Signal-II
Approved by: Rajendra Dhambel, Principal Executive Director/S&T
Purpose: Defines technical specifications and inspection criteria for LED signal lighting units for subsidiary colour light signals (route, shunt, calling-on, and tunnel signals) for railway signalling.
Document Data Sheet: Provides details of the document's designation, title, author, and approver.

Technical Specifications

LED Signal Lighting Units: Designed for use in railway signalling applications, specifically for subsidiary colour light signals (route, shunt, calling-on, and tunnel).
Standards Compliance: Incorporates relevant Indian Railway Standards (RDSO), British Standards, and International Standards.
Color Coordinates: Specifications for color coordinates of LED signals are outlined, referencing British Standards (BS: 1376).
Operating Parameters: Provides detailed operating parameters, including rated voltage, current, illumination, and colour tolerances, for different signal types (C-ON, Route Lighting, Shunt).
Tunnel Signals (Metro Railway, Kolkata): Specific requirements for LED signals used in tunnels of the Kolkata Metro Railway are detailed, addressing aspect variations, visibility distances, and fixture integration.
Dimensions: Specifies display area dimensions for calling-on, route, and shunt types of signals.
Materials: Details required material and components (e.g., polycarbonate cover, industrial grade plastic, etc.), ensuring components meet relevant standards.

General Requirements & Testing

Visibility Distance: Minimum visibility distances (400m or 200m) for different signal types are detailed, considering factors like peak daylight and signal placement.
Signal Housing Compatibility: LED signal units must be compatible with existing signal housings, adhering to specified dimensions.
Testing and Performance Criteria: Procedures outlined for type tests and acceptance tests, including visual inspections, dimensional checks, operating parameters, compatibility with existing equipment, and environmental testing (vibration, thermal cycling).

Additional Information

Documentation: Requirements for provided documentation alongside the supplied units are included, ranging from installation manuals to test data.
Packing and Handling: Packaging particulars and safety instructions for handling the units during transit are detailed.
Warranty: The specified warranty period for LED signal lighting units is 60 months. Defective lamps replaced within 45 days of reported failure by the railway.
Table Of Contents: Includes a sequential listing of various clauses, with a corresponding page number for easy navigability within the document.
Annexures: Annexures contain supporting data or diagrams, such as chromaticity limits for signal colors, measuring procedures for dispersion angles.
Dispersion Angle: Measurement procedure, detailing the method for obtaining the dispersion angle.

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Description

This quiz covers the technical specifications for LED signal lighting units used in subsidiary colour light signals within railway signalling systems. It includes details regarding standards compliance and inspection criteria, focusing on various signal types such as route and shunt signals.