Apparatus for detecting ground fault in variable-voltage variabl

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

1984-01-17

1986-05-13

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 47, 361 20, 361 86, H02H 316

Patent

active

045890480

ABSTRACT:
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.

REFERENCES:
patent: 2342800 (1944-02-01), Griscom
patent: 2836771 (1958-05-01), Jessee
patent: 4429338 (1984-01-01), Becker et al.

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