Apparatus and method for detecting power of a three phase altern

Details Apparatus and method for detecting power of a three phase altern Apparatus and method for detecting power of a three phase altern

1992-11-24

1995-08-15

Nguyen, Vinh

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Polyphase

324141, 324142, G01R 2106, G01R 1116

Patent

active

054422795

ABSTRACT:
An electric power detector for a three-phase AC voltage supply which measures the current of one phase and the voltage between the one phase and another phase and computes the phase difference between the voltage and the current, decides the phase rotation direction by comparing the phase difference with a specified angle, and obtains a power factor angle by adding or subtracting 30.degree. to or from the phase difference corresponding to the result of the decision to produce a power factor angle for computing three-phase power.

REFERENCES:
patent: 4454471 (1984-06-01), Schwendtner et al.
patent: 4556843 (1985-12-01), Milkovic et al.
patent: 5017860 (1991-05-01), Germer et al.
patent: 5212441 (1993-05-01), McEachern et al.
Instruction Manual--"Digital AC Power Meter Type 2503" by Yokohawa Denki (Aug. 1983).

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