Study of earth fault protection system for substation of battery powered railway vehicle

Today, a lot of accumulator trains are introduced for saving the global environments. In the East Japan railway, a new battery powered railway vehicle called ACCUM on the non-electrified Oga line has been operated on March 4. ACCUM is provided AC-20kV energy from Oga substation. This substation has to possess earth fault protection system not to effect railway peripheral facilities and customers. However, it is necessary to considerate a special protection circuit because the substation has a short feeding circuit. Therefore this paper shows the earth fault protection system provided on Oga line.