Monitoring system for an LC filter circuit in an AC power network
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United States of America Patent
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-
Oct 11, 1983
Grant Date -
N/A
app pub date -
May 26, 1981
filing date -
May 27, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A monitoring system for measuring the phase currents of a filter circuit, the monitoring system having current measuring transformers coupled to respective filter sections for suppressing the harmonic content. Voltage measuring transformers are provided for measuring the network phase voltages, each such voltage measuring transformer being coupled to an electronic filter simulator and a filtering section for suppressing harmonic content. The fundamental frequency component of the measured phase currents and the simulated phase currents are conducted to transient comparator circuitry which is coupled to indicating and triggering circuitry having individual counter stages. Only rapid variations between the measured and simulated phase currents will result in fault indications, thereby preventing false indications resulting from variations in temperature.
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