04896115 is referenced by 20 patents and cites 13 patents.

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.

Title
Electrical network insulation monitoring and measuring device
Application Number
7/201014
Publication Number
4896115
Application Date
June 1, 1988
Publication Date
January 23, 1990
Inventor
Christian Pellegrin
Grenoble
FR
Philippe Schuster
Grenoble
FR
Philippe LeMaitre
Grenoble
FR
Agent
Arnold White & Durkee
Assignee
Merlin Gerin
FR
IPC
G01R 31/02
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