G - Physics – 01 – R
Patent
G - Physics
01
R
324/58.4
G01R 31/02 (2006.01) G01R 27/18 (2006.01) H02H 3/16 (2006.01) H02H 3/34 (2006.01) H02H 7/08 (2006.01)
Patent
CA 1210453
ABSTRACT OF THE DISCLOSURE The invention provides an apparatus for detecting a ground fault in a power system which supplies an elec- tric 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 detecting means having respective threshold values for frequency detection, and the output signals of the current (voltage) and frequency detecting means are discriminated in accordance with predetermined logical condition, to produce a signal representative of a ground fault.
450217
Kirby Eades Gale Baker
Mitsubishi Denki Kabushiki Kaisha
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