Ground fault current limiter and method of limiting ground fault

Details Ground fault current limiter and method of limiting ground fault Ground fault current limiter and method of limiting ground fault

1995-05-16

1997-12-16

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 58, H02H 908

Patent

active

056992190

ABSTRACT:
A ground fault current limiter, in which reactors are connected in series to a neutral point for compensating for capacitances to ground of a power switches capable of turning ON/OFF at a high speed are connected in parallel with respective reactors, occurrence of a ground fault is detected from a phase difference between a zero-phase sequence current and a zero-phase sequence voltage at time of sampling, an optimal compensation quantity of capacitances to ground is computed based on the zero-phase sequence current and the zero-phase sequence voltage at time of occurrence of a ground fault, and ON/OFF of the switches are controlled thereby to alter the reactor quantity so as to correspond to the compensation quantity.

REFERENCES:
patent: 3657728 (1972-04-01), Mitsui et al.
patent: 4464696 (1984-08-01), Masui et al.

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