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

1989-07-25

Strecker, Gerard R.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

324509, 324544, 324551, G01R 2700, G01R 3102

Patent

active

048517615

ABSTRACT:
A method for measuring an insulation resistance of an electric line. A low frequency signal, which has the same frequency as a signal applied to the electric line and is in phase with the line applied signal or shifted by 90 degrees therefrom, is applied with the amplitude value being varied with a period T. A leakage current sent to synchronous detector is adjusted with respect to its phase or a reference signal is adjusted with respect to its phase to minimize (make zero) or maximize one of induced effective components or induced ineffective or reactive components of the leakage current having a frequency of 1/T.

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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