G - Physics – 01 – R
Patent
G - Physics
01
R
324/35
G01R 23/00 (2006.01) G01R 11/52 (2006.01) G01R 27/00 (2006.01) H02H 3/36 (2006.01) H02H 3/44 (2006.01) H02H 7/16 (2006.01)
Patent
CA 1189146
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 funda- mental 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 varia- tions in temperature.
378349
Becker Michael
Fendt Alfons
Povh Dusan
Renz Klaus
Schuch Gerhard
Aktiengesellschaft Siemens
Fetherstonhaugh & Co.
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