GROUNDING RESISTANCE METER AND GROUNDING STATE DISCRIMINATION METHOD

摘要

PROBLEM TO BE SOLVED: To surely discriminate the grounding states of a first auxiliary grounding pole and a second auxiliary grounding pole.;SOLUTION: A processing part 9 controls a switch part 5 in composite grounding resistance calculation processing, and while successively shifting to a connection state of connecting a parallel circuit of a serial circuit of a signal generation part 2 and an AC ammeter 3 and an AC voltmeter 4 between an earth pole E and the first auxiliary grounding pole P, a connection state of connecting a parallel circuit between the earth pole E and the second auxiliary grounding pole C and a connection state of connecting a parallel circuit between the first auxiliary grounding pole P and the second auxiliary grounding pole C, calculates respective composite grounding resistances mutually among the respective poles E, P and C on the basis of an AC current I1 measured in the AC ammeter 3 and an AC voltage V1 measured in the AC voltmeter 4 in the respective connection states, calculates the grounding resistances Re, Rp and Rc of the respective poles E, P and C on the basis of the respective composite grounding resistances in grounding resistance calculation processing, and discriminates the quality of the respective grounding states of the auxiliary grounding poles P and C on the basis of the respective grounding resistances Re, Rp and Rc in grounding state discrimination processing.;COPYRIGHT: (C)2012,JPO&INPIT