Digital isolation monitor for an electrical power system

Details Digital isolation monitor for an electrical power system Digital isolation monitor for an electrical power system

1990-05-18

1992-03-31

Wieder, Kenneth A.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of ground fault indication

324520, 324541, 324551, 324659, 324676, 324681, 324711, 324718, G01R 3108

Patent

active

051011603

ABSTRACT:
A digital isolation monitor comprises a digital processing signal processor P1 designed to synthesize a sine wave in real time by a table, and to send the digital values of this sine wave to a digital-to-analog converter of an input channel to generate a low-frequency AC reference signal with a very low, stable phase distortion factor. An acquisition channel is fitted with a switching unit operating in conjunction with a dual measurement circuit to send an injected voltage signal and a leakage current signal to a low-pass analog filter in series with a sample-and-hold circuit and an analog-to-digital converter. The processor P1 then performs synchronous demodulation and transmits the data to a microcontroller P2.

REFERENCES:
patent: 3569826 (1971-03-01), Burnett
patent: 3737765 (1973-06-01), Lee et al.
patent: 3971007 (1976-07-01), Borkovitz et al.
patent: 4054832 (1977-10-01), Reynolds et al.
patent: 4206398 (1980-06-01), Janning
patent: 4472676 (1984-09-01), Eichmann et al.
patent: 4528497 (1985-07-01), Arato
patent: 4851782 (1989-07-01), Jeerings et al.
patent: 4896115 (1990-01-01), LeMaitre et al.
Patent Abstract of Japan, vol. 7, No. 134 (P-203) [1279] Jun. 11, 1983.

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