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

1984-03-22

1986-05-13

Scott, J. R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 47, H02H 316

Patent

active

045890463

ABSTRACT:
An apparatus for detecting a ground fault in a power system which supplies an electric power whose frequency is varied while being kept at a predetermined ratio to the voltage thereof. In this apparatus, a zero phase sequence current (voltage) from such power system is introduced to a plurality of current (voltage) detectors having respective threshold values for current (voltage) level detection, while a voltage related to the frequency of the electric power is introduced to a plurality of frequency detectors having respective threshold values for frequency detection, and the output signals of the current (voltage) and frequency detectors are discriminated in accordance with predetermined logical condition, to produce a signal representative of a ground fault.

REFERENCES:
patent: 2177900 (1939-10-01), Logan
patent: 3728618 (1973-04-01), Nimes
patent: 4258403 (1981-03-01), Shimp

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