Method for compensating for phase of insulation resistance measu

Details Method for compensating for phase of insulation resistance measu Method for compensating for phase of insulation resistance measu

1988-11-03

1989-08-15

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

For fault location

324551, 324544, 324522, G01R 3102

Patent

active

048578550

ABSTRACT:
A method for measuring an insulation resistance of an electric line is disclosed. 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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