Apparatus for detecting high impedance fault
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United States of America Patent
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Dec 12, 1995
Issued Date -
N/A
app pub date -
Aug 26, 1993
filing date -
Apr 18, 1991
priority date (Note) -
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Abstract
An apparatus for detecting differences between zero-sequence current caused by load unbalance and fault current caused by fallen distribution conductors. The apparatus makes it possible to readily check a high impedance fault. The apparatus includes analog-to-digital converters for converting analog A-, B-, C- and neutral phase current signals to digital data, respectively. The apparatus further includes a data processing system for computing even order power, rate of the even order to odd order power, and incremental variance of even order power. The apparatus analyzes the digital data and determines the fault when the computed information is compared with respective setting values and is greater than the setting values.
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