Synchronous closing system and latch therefor

Details Synchronous closing system and latch therefor Synchronous closing system and latch therefor

1980-03-28

1981-12-15

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Arc suppression at switching point

200 82B, 200144AP, H01H 956

Patent

active

043062636

ABSTRACT:
A synchronous closing system for high voltage circuit breakers is disclosed wherein the circuit breaker main contacts close within about 1 millisecond of a current zero in the current through a closing resistor in a 60 hertz system. Closing accuracy is obtained by delaying the release of a latch which holds the closing system for a given delay following the appearance of a closing signal, which delay enables hydraulic operating pressures to come to full value before permitting the hydraulic operation of the closing piston. The latch release instant is controlled from a signal derived from a zero cross-monitor circuit, which monitors resistor current and releases the latch at a time which allows contact closing at a subsequent current zero. The closing mechanism may be slightly jogged before full motion and during the delay time.

REFERENCES:
patent: 3566152 (1971-02-01), Casey
patent: 3808455 (1974-04-01), Leisi

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