ATraining Presentation

On

TRAIN LIGHTING

CONTENTS

1) Introduction

2) Train lighting

3) Brushless Alternator

4) RRU

5) Batteries

6) Fluorescent Tube Light

Introduction

Train lighting plays an important role in Indian Railway. Although first train ran on 16th April 1883 from Mumbai to Thane, train lighting system came to Indian Railways only by 1930.

Brushless alternator supplies the load when train is in motion and charges the batteries. The batteries supply the load when train is stationary.

System of Train Lighting

Axle Driven System

Mid On Generation System

End On Generation System

Axle Driven System

In this system 4.5 KW brushless alternators are driven through V-belts from axle.

Lead acid batteries 11O V, 120 Ah arranged from 3 cell Mono Block units.

An external battery charging terminal (BCT) is provided to charge the battery from external charger, if battery is in rundown condition due to failure of alternator.

110 V DC TL System

Brushless Alternators

Approved manufacturers for the alternators are:

  KEL (Kerala Electrical & Allied Engineering Industries)

BEACON ( Best & Crompton)

SIL ( Stone India Limited)

HMTD Engineering 

CGL (Crompton Greaves Limited)

 

The ratings of Alternator in use are:-

3.0 KW, 120 V for MG non-AC coaches.

4.5 KW, 120V BG non-AC coaches.

12.0 KW, 120 V for MG AC coaches.

18.0 KW, 130 V for BG AC coaches (old).

25 KW,130V, alternator for BG AC coaches (new).

Rectifier Cum Regulator Unit

RRU is connected just beside the alternator to

rectify the output of the generator.

A magnetic amplifier is connected which

convert the 3-phase input to 110 V DC

A safety fuse of 10 amp is connected to prevent

the RRU box from abnormal conditions.

Functions of RRU

Rectifying 3 phase AC output of alternator to DC using full wave rectifier bridge.

Regulating the voltage generated by alternator at set value.

Regulating output current at set value.

Components of RRU

Three phase bridge output rectifier consisting of six silicon diodes D1 to D6.

Single phase full wave field rectifier diodes D16 and D17.

Two sensing diodes (D19, D20 for current/voltage sensing).

Current transformer. Field transformer.

Components of RRU

Batteries

Conventional Lead Acid Cells for TL applications are used.

The output of the RRU is given to battery box to charge the battery.

BCT is provided for external charging of the batteries at stations or maintenance lines.

Construction of VRLA Cell

Fluorescent Tube Light

It is a 2 feet long,18 Watt fluorescent tube

light provided in the coach for the sitting

gallery light and 11 Watt for toilet light.

It works at 110V DC supply.

It gives good light with 30% and 70% power

supply.

Thank You !!