| 摘要 |
<P>PROBLEM TO BE SOLVED: To highly accurately detect ground faults generated in transmission and distribution lines to improve the reliability of the detection. <P>SOLUTION: A ground-fault detector monitors the voltage change (for example, electrostatic potential) caused in the transmission and distribution lines upon generation of a fault, drives ground fault current detection means (electrostatic potential sensor part 4A, ground fault current sensor part 4B) upon generation of a fault that causes a voltage change, detects a ground fault current by the ground fault current detection means, determines whether a ground fault has occurred in the transmission and distribution lines based on the ground current detection result, and notifies the determination result. <P>COPYRIGHT: (C)2011,JPO&INPIT |
