Electricity: electrical systems and devices – Safety and protection of systems and devices – Arc suppression at switching point
Patent
1994-12-08
1996-03-26
DeBoer, Todd
Electricity: electrical systems and devices
Safety and protection of systems and devices
Arc suppression at switching point
361 4, 361196, 307137, 307 106, 307 107, H01H 16
Patent
active
055026095
ABSTRACT:
A contactor control system for a DC electric power system for reducing contactor tip contamination from dry-switching includes a first switch connected in circuit between a power source and a controller for enabling the controller upon closure of the first switch. A PTC resistor is connected between the first switch and a filter capacitor whereby charging current is supplied to the capacitor upon closure of the first switch. A solid-state switch is connected in series circuit with an electromagnetic actuator of a contactor having power contact tips in circuit between the power source and a load. The series combination of the actuator and solid-state switch is connected in parallel circuit with the filter capacitor. The controller is operable to gate the solid state switch into conduction when voltage on the capacitor exceeds a preselected voltage whereby discharge current from the capacitor is effective to energize the actuator for closing the contact tips such that voltage on the capacitor is less than the source voltage at contactor closure to affect a current through the contactor at closure.
REFERENCES:
patent: 3656045 (1972-04-01), Frezzolini et al.
patent: 3774082 (1973-11-01), Chang
patent: 3993914 (1976-11-01), Conrad et al.
Ball Larry G.
Thomas Sherrill G.
DeBoer Todd
General Electric Company
Krisher, Jr. Ralph E.
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