Indian Railway is the largest serving authority in the world, and it is more important than ever to make its energy efficient and economically by reducing the losses and wastage of diesel fuel. One of the ways to achieve this is by using a system called Head on Generation (HOG) which taps power supply from overhead electric equipment (OHE) and distributes it to train coaches for lighting and air-conditioning.
HOG works on the principle that the locomotive hauling the train feeds power supply requirement of the complete train having AC/Non AC coaches through OHE transformer and converter in the locomotive without the need for having individual self generating equipment in each coach. The hotel load winding of 945 KVA of transformer feed power to two 500KVA static converter which convert single phase 750 V supply into 750 V three phase supply. The three phase supply is transmitted to both the feeder of the existing EOG train through IV coupler. Then a 60KVA transformer is used in coaches which convert this three phase 750V into three phase 415V AC and this supply is used for the hotel load of the train.
HOG is a clean technology that can improve the energy efficiency, comfort and safety of Indian Railway passengers and staff. It can also reduce the environmental impact and operational cost of railway services.
