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TRAIN LIGHTING

Contents Introduction Train lighting Brushless Alternator RRU Batteries 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(MOD) System

• End On Generation(EOD) 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 Limited)• • 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,130 V 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 110V DC.

• A safety fuse of 10amp 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 rectifier consisting of six silicon diodes D1 to D6.

• Single phase full wave 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 11watt for toilet light.

• It works at 110V DC supply.

• It gives good light with 30% and 70% power

supply.s

Save Electricity

Thank You !!