Contactor control system

Details Contactor control system Contactor control system

1988-04-18

1990-05-01

Deboer, Todd E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Arc suppression at switching point

361 5, 361 2, 361 87, 361146, 364483, H02H 3033

Patent

active

049223631

ABSTRACT:
A method and apparatus in a control system for an electromagnetic contactor for reducing multiple re-ignitions incorporates a regulated source of electrical power coupled to a contactor actuating coil through a controllable switch. The switch is used to regulate coil current to a desired value whereby opening time of the contactor can be determined within a defined range. Alternating current through tips of the contactor is monitored and each zero crossing of the current wave form is determined. The control system responds to a command to open the contactor tips by coordinating such opening with the zero crossings of the current wave form whereby the contact tips separate within a predetermined phase angle prior to a zero crossing. The system also includes apparatus for detecting a fault current of the alternating current in the contact tips and for inhibiting operation of the contact tips for a predetermined time interval in order to allow fuses to clear the fault prior to opening the contactor.

REFERENCES:
patent: 4153922 (1979-05-01), Azume et al.
patent: 4356525 (1982-10-01), Kornrumpf et al.
patent: 4392171 (1983-07-01), Kornrumpf
patent: 4399483 (1983-08-01), Phelan
patent: 4445183 (1984-04-01), McCollum et al.
patent: 4536188 (1985-08-01), Nielsen
patent: 4709296 (1987-11-01), Hung et al.

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