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Regenerative Braking IR  
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Sep 26 2011 (23:10)

Entry# 769     
Regenerative Braking IR

Sep 26 2011 (23:07)
News Entry# 40241  Regenerative braking helps Railways to save energy, money  
Posted by: Jayashree ❖ Amita*^   Added by: rdb*^  Sep 26 2011 (23:10)
Sept 26, 2011
ALLAHABAD: Application of brakes in trains invariably results in loss of energy. However, conservation of energy by utilising the technology of regenerative braking in electric locomotives has helped the North Central Railway to save about 15 million units of electricity costing about Rs six crore in the current financial year.
When trains are required to be stopped or slowed down near railway stations or signals, the driver applies brakes. For this purpose, there are mechanical brakes, which work on compressed air, by converting the energy of the motion of a
running train to frictional losses.
However, in three-phased locomotives, even these losses are recovered. When the driver of a train wants to stop or slow down a train, he applies regenerative braking. The motors of the locomotives which are normally pulling the train, change their mode of operation from motor to a generator. The mechanical energy of the train is converted to electrical energy by the generator, which then goes to the power supply grid. This feature is called regenerative braking. Thus, even braking losses are gainfully utilised in three phase locomotives.
Pointedly, over the years, the technology upgradation has taken place in electric locomotives, which has contributed in overall objective of Railways to conserve precious electric energy. With this objective in mind, 3 phase locomotives were inducted into Railways almost 15 years ago. Initially, these locomotives were imported from Switzerland on ToT basis (Transfer of Technology). As per this agreement, when complete equipment is imported, the foreign company also undertakes to transfer the entire knowhow to the indigenous company for enabling the latter to manufacture the imported equipment in the country. After 5 years, CLW (Chitranjan Locomotives Works) started the production of three phase locomotive indigenously gradually reducing the import content to 5% only.
North Central Railway runs around 250 passenger trains and 150 trains every day by electric locomotives. Out of these, about 25% of trains are run by about three phase locomotives. Since drivers running such locomotives were required to be given special training to utilise this feature, NCR has trained all its drivers to utilise regenerative braking. Due to intelligent application of this feature, NCR has saved about 15 million units of electricity costing Rs 6 crores.
Talking to TOI, Sandeep Mathur, chief public relations officer of North Central Railway informed that conservation of energy is vital in the present times and Railways is committed for this. "Through the utilisation of regenerative braking in electric locomotives, we are saving energy," Mathur said.
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