CLAMP METER AND DC GROUND FAULT LINE EXPLORATION METHOD

摘要

PROBLEM TO BE SOLVED: To provide a clamp meter with reduced size and reduced weight and a DC ground fault line exploration method capable of easily locating a ground fault line. SOLUTION: The clamp meter 10 includes: a clamp type current transformer 15 for detecting an AC ground fault current flowing each of a plurality of branch lines; an AC power supply 16 applying an AC voltage to the plurality of branch lines; a capacitive current eliminating means (variable coil 18, switch 19, and winding 20 with tap) for eliminating a capacitive current to the ground included in the AC ground fault current detected by the clamp type current transformer 15; and a ground fault current measurement part 22 for measuring a current value of the ground fault current included in the AC ground fault current detected by the clamp type current transformer 15. COPYRIGHT: (C)2009,JPO&INPIT