Electrical network insulation monitoring and measuring device

Details Electrical network insulation monitoring and measuring device Electrical network insulation monitoring and measuring device

1988-06-01

1990-01-23

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

324509, 324541, G01R 3102

Patent

active

048961159

ABSTRACT:
An insulation monitoring device comprises an input circuit of a reference AC signal, and an electronic detection circuit for discriminating the components of a measurement signal proportional to the ground fault impedance Z formed by a leakage resistor Rf in parallel with a leakage capacitor C. A synchronous detector has a pair of static inverters processing the first component, which is a function of the current IR flowing through the leakage resistor Rf, and of the second component which is a function of the current IC flowing through the capacitor C. A converter cooperates with the generator to deliver two quadrature signals C1 and C2 to respectively control the inverters. A display means accurately displays the value of the leakage resistance Rf.

REFERENCES:
patent: 3976987 (1976-08-01), Anger
patent: 4142143 (1979-02-01), Daniel
patent: 4200835 (1980-04-01), Anahara et al.
patent: 4206398 (1980-06-01), Janning
patent: 4335348 (1982-06-01), Reed et al.
patent: 4422034 (1983-12-01), Matsuno et al.
patent: 4472676 (1984-09-01), Eichmann et al.
patent: 4791375 (1988-12-01), Kan

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