G - Physics – 01 – R
Patent
G - Physics
01
R
324/70
G01R 21/06 (2006.01) G01R 21/00 (2006.01)
Patent
CA 1215429
ELECTRONIC SOLID STATE Q-HOUR AND/OR COMBINATION Q-HOUR AND KILOWATT HOUR METER ABSTRACT OF THE DISCLOSURE An electronic solid state Q-hour meter for measuring leading and lagging VARS quantities of electric power over a defined range of power factor. The Q-hour meter comprises first and second time division/pulse width-amplitude modulated/analog multiplier circuits. First and second current transformers are coupled to first and second phases of a multi-phase power supply to be monitored for deriving first and second analog current indicating signals which are supplied to respective analog current input terminals of the analog multipliers. First and second potential transformers are coupled across the first and second phases of the multi-phase power supply for deriving first and second analog voltage indicating signals that are supplied to respective input terminals of the first and second analog multiplier circuits. An electronic phase shifting circuit is connected intermediate the output of one of the potential transformers and the input terminal to one of the analog multiplier circuits for shifting the phase to the voltage indicating signal supplied thereto sixty degrees lagging. The outputs of the analog multiplier circuits are summed together to derive an output analog signal representative of a loading and lagging VARS quantities of electric power. By combining the solid state Q-hour meter with an electronic solid state Kilowatt-hour meter a combination meter capable of measuring both Kilowatt hours and Q-hours is provided.
449031
Bogacki Anthony P.
Milkovic Miran
Company General Electric
Eckersley Raymond A.
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