Method and apparatus for detecting faults in an electric power distribution system
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United States of America Patent
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-
Apr 1, 1980
Grant Date -
N/A
app pub date -
Jun 5, 1978
filing date -
Jun 5, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Open conductors in an electric power distribution system are detected by sensing the abrupt change in balance of transformer magnetizing current among phases, particularly the third harmonic of the power system frequency. The current is sensed in each phase and the absolute magnitude of the third harmonic current is compared among the phases. When imbalance exceeds a predetermined value, a signal is produced.
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