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최창영(Chang-young Choi),강상희(Sang-Hee Kang),정호성(Ho-Sung Jung),유동영(Dong-Young Ryu) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.11
The ground faults in the DC traction power supply systems are usually detected by a potential relay. But it can't detect a fault if a fault occur with a big fault resistance. Moreover, if the rail potential goes high in the ordinary state because of the traction load, the potential relay would be maloperated. And this protection scheme cannot classify the faulted feeder and the rest healthy feeders. So a new ground fault protective relaying algorithm that can identify exactly the faulted region and can distinguish the ground fault and the potential rising of the rail is presented in this paper.