| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a ground fault detecting method for easily identifying a feeder wire where an intermittent ground fault occurs. <P>SOLUTION: The ground fault detecting method in a power distribution system where a plurality of feeder wires 2, 3, 4 are connected to a bus line 1 and zero-phase current transformers ZCT are provided for the respective feeder wires 2, 3, 4 measures secondary side terminal voltage of the zero-phase current transformers ZCT and detects the feeder wire 2 to which ground fault occurs on the basis of the measured terminal voltage. Also, the ground fault detecting method has a relay DG operating by the secondary side current of the zero-phase current transformers ZCT and detects a feeder wire to which a ground fault occurs on the basis of the secondary-side terminal voltage when the relay DG is in a non-operation state. <P>COPYRIGHT: (C)2013,JPO&INPIT |
