PPT ON EMU TRAIN

KUNDAN KUMARROLL NO – 09/1823WB ROLL NO – 09148016038 FUTURE INSTITUTE OF ENGG. AND MANAGEMENT

CONTENTS• INTRODUCTION• PANTOGRAPH• CIRCUIT BREAKER• MAIN TRANSFORMER• AUXILIARY 1 CIRCUIT• AUXILIARY 2 CIRCUIT• MAIN RECTIFIER• MOTOR• BRAKES • CONCLUSION• BIBLIOGRAPHY

INTRODUCTION

PANTOGRAPH

•It is a collapsible frame work made of metallic tubes and articulated by ball bearing.

•Pantograph is use for smooth and sparkless current collection from overhead line and to feed the tranformer primary winding through circuit breaker.

•It is designed to maintain the continuous flow of current inspite of oscillation at high speed and the varietion in height of the contact wire at different places.

Contd…

• The air pressure require for panto rise is 4.5 kg/cm² &3 – 3.5 kg/cm² for lowering.

• Time taken to raise - 6 to 10s & for lower - 10s.• Material of panto strips – Silica Manganese

spring steel.• Composition : Carbon + Manganese + Silicon +

Sulphur + Phosphorous.

CIRCUIT BREAKER

•It is a Electro – pneumatic high seed circuit breaker. It extends the 25kv power supply from pantograph to Transformer .

•Two type of circuit breaker are use in EMU. One is ABB & VCB.

MAIN TRANSFORMER

• In EMU step – down transformer use.• 25kv voltages is directly supplied to the

transformer primary and other end of primary winding is grounded with rail though axie brush.

• It secondary winding divided in two part.• 1st half is divided in five equal tap and other is

untapped.

Contd…

• The connection between tapped &untapped winding is being done by winding change over switch WCO(w1 & w2).

• Tapped portion give control the motor speed.• And other give auxiliary supply.• In transformer we are use force ventilation.• Transformer having three separate secondary winding.a) Motor b) Auxiliary 1 circuitc) Auxiliary 2 circuit

Contd…

AUXILIARY 1 CIRCUIT• EMU such as oil pump, oil pump & motor , oil

cooling system , rectifier cooling fan , battery charger supply of this given by aux – 1.

• Oil pump: - it is provided to circulate the transformer oil to keep it cool.

• Oil pump & motor: - it is mounted in transformer oil pipe line.

• Rectifier cool fan: - it is provided to cool the rectifier diodes.

AUXILIARY 2 CIRCUIT• The main compressor and LTR relay are

connected in in Auxiliary – 2 ckt . through the auxiliary supply rectifier.

• It is also given power supply in Signal Bell/Code Bell , Alarm Bell , Fans , Light , Emergency Lights , Head Light , Emergency Head Lights etc.

MAIN RECTIFIER

• Is connected between motor & transformer.• Full wave bridge rectifier is use.• For cooling use force ventilation.• Each bridge is protected with two fuses 1000

volt/1450amps.• over voltage protection,ac damping net work

system is there.

MOTOR

• The EMU motor are D.C. series self excitation type motors .

• There are 4 Traction motors in each motor coach and they are connected in parallel with the Rectifier DC output.

• Motors are axle mounted & nose suspended. A single reduction gear is used for Transmission of power to the axle.

• Each motor is having individual contactors both in positive and negative side.

Contd…

BRAKES• Five type of brakes present

in emu.a) E.P(Electro Pneumatic)b) Autoc) Emergencyd) GD’S Emergencye) Dead man device

CONCLUSION

• In EMU we are using DC series motor, when we can use AC motor also.

• some parts of emu not made in India.

BIBLIOGRAPHY

• Maintenance Manual – TRS/ER/BHEL.• Modern traction – H.Prefid.

THANK YOU