Ground fault monitoring device for an electrical power distribution system
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United States of America Patent
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-
Mar 28, 1995
Grant Date -
N/A
app pub date -
Apr 6, 1993
filing date -
Apr 28, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The monitoring device comprises a measuring channel of the ground fault voltage, a measuring channel of the ground fault current, and a digital processing circuit whose role is to search for and indicate the presence of a ground fault. The processing circuit determines the fundamental parts of the ground fault current and voltage to compute the phase difference .phi. between the two parts and the cos .phi. value. The evolution of this phase difference is representative of a fault.
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