Electronic three-phase watt-hour meter

Details Electronic three-phase watt-hour meter Electronic three-phase watt-hour meter

1980-09-05

1983-03-29

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Polyphase

324142, G01R 2106, G01R 1116

Patent

active

043785247

ABSTRACT:
An electronic multiphase watt-hour metering system containing time-division multiplying circuitry. A duty cycle modulator and a switching device are provided for each phase of interest, the output signals of which are combined and conducted to a current-to-frequency converter. The output frequency of the current-to-frequency converter is responsive to the rate of electrical power consumption from a multiphase transmission system. In one embodiment, the current-to-frequency converter is coupled at its output to an accumulating counting system for recording the total energy supplied to a load. There may further be provided an indicator responsive to the frequency of the current-to-frequency converter for providing a visual indication of the instantaneous rate of power usage.

REFERENCES:
patent: 3953795 (1976-04-01), Brunner et al.
patent: 4217545 (1980-08-01), Kusui et al.
Graeme et al.; Operational Amplifiers-Design & App.; 1971; McGraw-Hill Book Co., N.Y., N.Y.; p. 274.

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