Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Multiple contact type
Patent
1991-07-10
1993-04-27
Donovan, Lincoln
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Multiple contact type
200144B, H01H 6702
Patent
active
052066169
ABSTRACT:
A switching device for the interruption of a fault current includes a housing having first and second electrical connectors for connection in the path of an electrical conductor carrying a single current phase. A vacuum switching chamber is disposed in the housing. A current transformer disposed in the housing includes a primary circuit connected between the first and second terminals for conducting the single current phase and inducing a corresponding current in a secondary winding. A magnet actuator disposed in the housing is electrically coupled to the transformer secondary winding. The magnet actuator is responsive to a fault current in the transformer primary, by way of the corresponding current in the secondary, for changing from an inactive state to an actuated state. A latch disposed in the housing is connected for latching the movable switch contact in a closed position and for being unlatched in response to a change to the actuated state of the magnet actuator for moving the movable switch contact to an open position. A turn-off spring causes the latch to move the movable switch contact away from the stationary switch contact when the latch becomes unlatched.
REFERENCES:
patent: 4568804 (1986-02-01), Luehring
Schemmann, "Vakuum-Leistungsschalter in Ortsnetzverteilerstationen", etz Bd. 108 (1987) Heft 16, pp. 754-759.
Prospekt, "Fluarc FG 1", Merlin Gerin, Jul. 9th, 1984, D/B 513.
Donovan Lincoln
Sachsenwerk Aktiengesellschaft
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