PRESENTED BY:
K.SRIKANTH

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THREE PHASE LOCOMOTIVE
History of Indian Railways
• 1853 First railway train journeyed distance of
22 miles between Bombay and Thana.
• Initially, operated by private companies of Englishmen.
• 1925-1950 GOI took over the all the private railway companies.
• Development accelerated with the 5-year Plans
• INDIAN RAILWAYS have now become a largest unified State-enterprise.
Railway Zones in India
Electric Loco Shed, Lallaguda
• First established in 1893
• Closed in 1992.
• Renamed as Electric Loco Shed on September 6th , 1995
• Best loco shed in India
• Maintenance cost has been reduced from Rs 16.73lacs/loco to Rs 12.24 lacs/loco
• Call for maintenance of loco has raised to 45 days and 30,000kms.
What is this seminar about?
• Introduction about Locomotives
• Supply system for the loco
• Basic equipments in the loco
• How a loco works?
• A comparative study of three phase locomotive and a conventional locomotive
Supply system
• DC supply using third rail system
 1.5KV DC
 Hazard of electric shock
• 1-Φ AC system
 25 KV AC
 Poor regulation
Over Head Equipment
• Catenaries
• Droppers
• Constant tension type
• Cable goes over pulley terminated by weight
• Height 5.5m from rail
• Current section of contact wire 107sq.mm
Components of Locomotive
• Pantograph
• Vacuum circuit breaker
• Earthing switch
• Surge arresters
• Harmonic filters
• Main transformer
• Traction motor
• Battery
• Traction converter
• Auxiliary converter
Pantograph
• collects power from OHE
• Two pantographs for one loco
• Air pressure is used to raise or lower
• strips are made of manganese steel
• supported by insulators
Vacuum circuit breaker
Disconnects the loco from OHE in case of
• over voltages
• over currents
• short circuit
• power surges