小电流接地电网改进能量法接地选线原理

Variation of Energy to Detect Single-phase Earth Fault in Low Current Earth Electrical Distribution Networks 　　Abstract: In this paper, presented is a new method of energy variation to detect single-phase earth fault in low current earth electrical network. This method is based on the characteristic of zero-sequence voltage and current and the function consists of zero-sequence voltage, fault phase voltage and zero-sequence current. The energy variation of fault feeder has the different dire