Drive circuit for a main contactor

Details Drive circuit for a main contactor Drive circuit for a main contactor

1975-01-30

1976-02-24

Miller, J. D.

317 31, 317 49, H02H 324

Patent

active

039406636

ABSTRACT:
A drive circuit for a main contactor which opens the contactor when a voltage dip occurs and if the voltage dip is of short duration closes the contactor again but blocks reclosing if the voltage dip persists. The circuit includes means to form an undervoltage pulse which has a duration which is equal to the length of time an undervoltage is present or a predetermined maximum time which ever is shorter. As long as the undervoltage pulse is shorter than the predetermined maximum the contactor is again closed but should the undervoltage persists beyond the predetermined maximum pulse length the drive circuit is allowed to become permanently disabled until further action is taken.

REFERENCES:
patent: 3100854 (1963-08-01), Riebs
patent: 3317791 (1967-05-01), Price et al.
patent: 3440491 (1969-04-01), Tenenbaum et al.
patent: 3471749 (1969-10-01), Harris
patent: 3689887 (1972-09-01), Lafalce et al.
patent: 3757302 (1973-09-01), Pollitt
patent: 3878436 (1975-04-01), Bogel

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