H.V. current cut-out circuit

Details H.V. current cut-out circuit H.V. current cut-out circuit

1979-10-12

1981-08-25

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Arc suppression at switching point

361 55, H01H 3359

Patent

active

042863015

ABSTRACT:
The invention relates to a current cut-out circuit for a high-voltage electric installation, a current source being located on an input side and an earth fault possibly occurring on its output side. The circuit is characterized in that between the input and the output, it includes for each phase, in series, a cut-out device (1) with a high arcing voltage, said device opening very rapidly, and a circuit-breaker (2) which opens rapidly and, shunt-connected between the input of the cut-out device with a high arcing voltage and earth, a resistance (4) for limiting an earthing current which passes via an automatic cut-out (3) with a very short closing time and a short opening time. Structure (5) is provided for performing the sequence of following operations in a time shorter than half a period: closing the automatic cut-out, opening the high arcing voltage device, opening the rapid-opening circuit-breaker and the automatic cut-out, and, when the current passes through zero, cutting out the high arcing voltage device, the rapid-opening circuit-breaker and the automatic cut-out. The invention applies to protecting switchgear.

REFERENCES:
patent: 3214639 (1965-10-01), Carbanes et al.
patent: 3476978 (1969-11-01), Greenwood
patent: 3489951 (1970-01-01), Greenwood et al.

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