Power relay with assisted commutation

Details Power relay with assisted commutation Power relay with assisted commutation

1981-09-08

1983-07-05

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Arc suppression at switching point

361 13, H01H 3359

Patent

active

043921710

ABSTRACT:
The contacts of a power relay are shunted by a gateable semiconductor device to assist in the commutation of contact-destroying arcs upon making and breaking of the power relay contacts; current-detection apparatus, such as a current-sensing transformer and the like, are utilized in the conductors connecting the relay contacts and the gateable switching device to an input from an A.C. source. Control electronics receive the outputs of both current-sensing apparatus to gate the shunting device into conduction during relay contact closure and separation, in a manner to minimize the current passing through the shunting device and therefore to minimize the energy dissipated therein.

REFERENCES:
patent: 3372303 (1968-03-01), Knott
patent: 3474293 (1969-10-01), Siwko et al.
patent: 3555353 (1971-01-01), Casson
patent: 3675079 (1972-07-01), Labbaye et al.
patent: 4074333 (1978-02-01), Murakami et al.

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