Apparatus for detecting ground fault in variable- voltage...

Details Apparatus for detecting ground fault in variable- voltage... Apparatus for detecting ground fault in variable- voltage...

G - Physics

01

R

324/58.4

G01R 31/02 (2006.01) G01R 27/18 (2006.01) H02H 3/16 (2006.01)

Patent

CA 1210814

Abstract of the Disclosure An apparatus for detecting a ground fault occurring in a power system which furnishes an AC power from a variable- voltage variable-frequency power supply to a load via a voltage transformer. The apparatus compares a zero phase sequence current with a reference value and, upon detection of occurrence of a ground fault, produces an output signal representing the ground fault. Prior to such comparison, the zero phase sequence current is so processed as to be independent of the frequency of the power system or the reference value is so processed as to be dependent on the said frequency.

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