DETECTION AND REMOVAL DEVICE OF SINGLE LINE-TO-GROUND FAULT OF DISTRIBUTION LINE

摘要

PROBLEM TO BE SOLVED: To control a distribution system so that a photovoltaic power generator sustains power generation state, in the case of single line-to-ground fault of the distribution system.SOLUTION: Detection and removal devices 100a, 100b of single line-to-ground fault of a distribution line comprise: a detection unit 94 for detecting the phase of a ground fault upon occurrence of a single line-to-ground fault in a distribution line 12, and generating a single line open command for opening a single-phase switch 5 so as to interrupt a single line-to-ground phase thus detected; and a closing unit 95 outputting a command for closing the switch 5 of the ground fault phase after the switch 5 is opened. The detection unit 94 includes a ground fault detection unit 72 for detecting the ground fault phase of single line-to-ground fault of a distribution line 12, and a fault removal unit 28 for giving an open command so as to open the switch 5 of the ground fault phase, when the ground fault detection unit 72 detects the ground fault.