AC fault current limiting circuit

Details AC fault current limiting circuit AC fault current limiting circuit

1978-04-17

1979-08-14

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Impedance insertion

323 9, 361 2, 361 9, 361 11, 361 16, H02H 902

Patent

active

041647726

ABSTRACT:
Circuitry for limiting the instantaneous peak current, under fault conditions, of an AC power line, includes a high speed circuit breaker in series with a first capacitor in a main current-carrying branch, which branch is paralleled by two additional branches. According to various embodiments these branches contain various combinations of resistance, capacitance and spark gap elements whereby upon occurrence of the excess fault condition, the high speed circuit breaker opens. Thereafter the voltage buildup across the first series capacitor is sequentially commutated to a second branch having a capacitor and spark gap, with a predetermined arc-over voltage, and subsequently to a third resistive branch. The third branch effectively provides the peak current limiting impedance.

REFERENCES:
patent: 3809959 (1974-05-01), Pucher
patent: 4028592 (1977-06-01), Fahlen et al.
patent: 4056836 (1977-11-01), Knauer

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