AC Switching device

Details AC Switching device AC Switching device

1981-05-28

1983-01-25

Griffin, Donald A.

Electrical transmission or interconnection systems

Switching systems

Switch actuation

340310A, H04B 354, H01H 954

Patent

active

043705642

ABSTRACT:
An AC switching device includes a switch element associated with the primary side of a transformer so that the switching element is turned on or off always at a zero-crossing point where the alternating current shifts from predetermined one of the positive and negative phases to the other. The switching element is turned off at a zero-crossing point which occurs immediately after the arrival of a turn-off command signal while it is turned on at a zero-crossing point which occurs after the arrival of a turn-on command and at the same phase of the alternating current as the turn-off phase.

REFERENCES:
patent: 3446991 (1969-05-01), Howell
patent: 4121113 (1978-10-01), White et al.
patent: 4300126 (1981-11-01), Gajjar
patent: 4328482 (1982-05-01), Belcher et al.

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