Apparatus and method for measuring electrical energy and quadergy and for performing line frequency compensation
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United States of America Patent
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Aug 9, 1994
Grant Date -
N/A
app pub date -
Apr 16, 1993
filing date -
Apr 16, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus and method for measuring electrical energy and quadergy and for performing line frequency compensation includes a compensation integrated circuit for adjusting the determined reactive load quadergy, based on variations between the actual line frequency and the rated line frequency of the meter. Reactive load quadergy is determined by phase-shifting the line voltage by a fixed time interval, based on the rated line frequency of the meter. The determined reactive load quadergy is adjusted to compensate for variations in line frequency. Because the determined reactive load quadergy is output by an electric meter as a continuous pulse train, adjustment to the determined reactive load quadergy is performed by adding or subtracting state changes from the pulse train and then registering the adjusted reactive load quadergy.
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