Method of determining power measurements in an electrical energy meter
First Claim
1. A method of metering electrical energy comprising the steps of:
- sensing each phase of a circuit to generate analog voltage signals and analog current signals associated with each phase;
converting said analog voltage signals and said analog current signals into digital voltage signals and digital current signals, respectively, using time division multiplexing to provide three digital outputs, each digital output comprising at least one digital voltage signal and at least one digital current signal associated with the same phase; and
processing said digital outputs to generate signals representative of real power, the magnitude of reactive power, and apparent power, wherein said signals representative of the magnitude of reactive power are generated from said signals representative of real power and said signals representative of apparent power.
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Abstract
A method is described for metering electrical energy. The method includes sensing each phase of a circuit to generate analog voltage signals and analog current signals associated with each phase. The analog voltage signals and said analog current signals are converted into digital voltage signals and digital current signals, respectively, using time division multiplexing to provide three digital outputs. The digital outputs comprise at least one digital voltage signal and at least one digital current signal associated with the same phase. The digital outputs are processed to generate signals representative of real power, the magnitude of reactive power, and apparent power, wherein the signals representative of the magnitude of reactive power are generated from the signals representative of real power and the signals representative of apparent power.
36 Citations
6 Claims
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1. A method of metering electrical energy comprising the steps of:
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sensing each phase of a circuit to generate analog voltage signals and analog current signals associated with each phase; converting said analog voltage signals and said analog current signals into digital voltage signals and digital current signals, respectively, using time division multiplexing to provide three digital outputs, each digital output comprising at least one digital voltage signal and at least one digital current signal associated with the same phase; and processing said digital outputs to generate signals representative of real power, the magnitude of reactive power, and apparent power, wherein said signals representative of the magnitude of reactive power are generated from said signals representative of real power and said signals representative of apparent power. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification