Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural inputs
Patent
1990-02-13
1992-01-14
Wieder, Kenneth A.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Plural inputs
324141, 324 83R, 364481, G01R 2106
Patent
active
050814133
ABSTRACT:
A method and apparatus for measuring AC power, in which a measured digital value of an AC voltage is decomposed into two components with a phase difference of 90.degree. therebetween, while a measured digital value of an AC current is decomposed into two components with a phase difference of 90.degree. therebetween, and a scalar product of a first vector consisting of the two components of the AC voltage and a second vector consisting of the two components of the AC current is calculated. The scalar product thus calculated represents active power carried by the AC current at the AC voltage. Separately, absolute value of vector product of the first vector and the second vector may be calculated, which absolute value of the vector product represents reactive power carried by the AC current at the AC voltage.
Kikuchi Jin-ichi
Yamada Chitoshi
Ohkura Electric Co. Ltd.
Solis Jose M.
Wieder Kenneth A.
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