Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1981-05-26
1983-10-11
Krawczewicz, Stanley T.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 60C, 324434, G01R 2700
Patent
active
044095422
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.
REFERENCES:
patent: 3200392 (1965-08-01), Chumakov
patent: 3466538 (1969-09-01), Becker et al.
patent: 3735250 (1973-05-01), Masui
patent: 3832631 (1974-08-01), Koga et al.
patent: 4243933 (1981-01-01), Rollman
Becker Michael
Fendt Alfons
Povh Dusan
Renz Klaus
Schuch Gerhard
Krawczewicz Stanley T.
Siemens Aktiengesellschaft
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