Ground fault monitoring device for an electrical power distribut

Details Ground fault monitoring device for an electrical power distribut Ground fault monitoring device for an electrical power distribut

1993-04-06

1995-03-28

Wieder, Kenneth A.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of ground fault indication

324500, 361 42, 361 85, G01R 3102

Patent

active

054020719

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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