Methods and apparatus for differential current measurement in a three-phase power system
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United States of America Patent
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Jan 14, 2003
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N/A
app pub date -
Mar 28, 2001
filing date -
Mar 28, 2001
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Abstract
A measure of the current through a first terminal of a device in a three-phase power system is obtained for each phase of the system. A measure of the current through a second terminal is also obtained for each phase. To compensate for any changes in phase introduced by the device between the first and second terminals, the measured currents obtained for each phase at those terminals are normalized using a novel, generalized normalization transform having the form: G(.theta.)=cos(.theta.)U+sin(.theta.)J where U represents a unit zero degree phase shift with zero sequence components removed, and J represents a unit ninety degree phase shift with zero sequence components removed. From the normalized currents, a differential current is then calculated for each phase.
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