Method for measuring insulation resistance of electric line

Details Method for measuring insulation resistance of electric line Method for measuring insulation resistance of electric line

1988-11-03

1989-08-15

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

324509, 324544, 324551, G01R 3100, G01R 3112

Patent

active

048578304

ABSTRACT:
A method of measuring an insulation resistance of an electric line. An AC signal voltage having a frequency of f.sub.i is applied to the electric line through a voltage transformer or a current transformer coupled to a grounding conductor or to the electric line. Phase measuring currents having frequencies (f.sub.1 -f.sub.S) and (f.sub.1 +f.sub.S) are also applied to the electric line through a winding of the current transformer or voltage transformer. A leakage current component and the AC signal voltage are synchronously detected to obtain a synchronously detected output and the phase of the AC signal voltage of the frequency f.sub.1 necessary for the synchronous detection is automatically adjusted so that a component of the synchronously detected output having a frequency f.sub.S becomes zero.

REFERENCES:
patent: 4200835 (1980-04-01), Anahara et al.
patent: 4422034 (1983-12-01), Matsuno et al.
patent: 4472676 (1984-09-01), Eichmann et al.
patent: 4638242 (1987-01-01), Matsuno
patent: 4791375 (1988-12-01), Kan

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