System and method for rms overcurrent backup function
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United States of America Patent
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Feb 6, 2001
Grant Date -
N/A
app pub date -
Mar 10, 1998
filing date -
Mar 10, 1998
priority date (Note) -
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Abstract
A method and apparatus for over current backup protection is provided. The method generates a set of root mean square (rms) values from samples that are taken from the system current. Several rms current values are averaged to generate an estimated rms over current value. The estimated over current value is compared with a predetermined threshold value. If the estimated current is above the predetermined threshold value, a fault protection mechanism, such as opening a circuit breaker, is activated. A generator protection unit having digital signal processing capabilities executes the inventive method to provide protection from over current episodes.
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