H - Electricity – 02 – H
Patent
H - Electricity
02
H
324/58, 333/73
H02H 7/16 (2006.01) G01R 31/01 (2006.01) H03H 7/01 (2006.01)
Patent
CA 1164048
ABSTRACT OF THE DISCLOSURE A circuit for monitoring the capacitor battery of a filter circuit connected to a transmission line, the capacitor battery consisting of at least two parallel legs, each with a number of series-connected capacitors. A first signal is produced which corresponds to the total alternating cur- rent flowing through the capacitor battery. A second signal is produced which corresponds to the difference between the currents flowing through the respective parallel legs of the capacitor battery. The current dif- ference signal is compared with a respective fraction of the total current signal. A fault indicator signal is produced if the difference between the difference current signal and the fractional total current signal exceeds a predetermined threshold value. Further circuitry is provided for correct- ing drift in the difference current signal, which may be caused by tempera- ture variations or acceptable capacitor failures. Automatic ranging cir- cuitry may be provided in embodiments of the invention in which the total capacitor battery current varies in amplitude over a large range.
356858
Becker Michael
Renz Klaus
Weibelzahl Manfred
Aktiengesellschaft Siemens
Fetherstonhaugh & Co.
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