H - Electricity – 01 – H
Patent
H - Electricity
01
H
306/215, 306/228
H01H 33/66 (2006.01) H01H 33/12 (2006.01) H01H 33/14 (2006.01) H01H 33/666 (2006.01)
Patent
CA 1289995
ABSTRACT OF THE DISCLOSURE An electrical switching device for switching high voltages in a network having a defined rated voltage. The device includes a series connection of at least first and second current interrupters having control elements across which a load voltage is distributed. Each interrupter operates according to different quenching principles and exhibits different dielectric behavior immediately after a zero passage of load current to be interrupted. The first interrupter comprises a first switch which has an operating voltage that is low relative to a mains voltage of the network and includes means for interrupting, at relatively low switching voltages without participation of the second interrupter, currents having inductive components. The second interrupter comprises a second switch having switching contacts and delay means for opening such switching contacts with a time delay of several milliseconds after the first interrupter is opened for interrupting load currents that are small relative to currents interrupted by the first interrupter. The series connection of the interrupters interrupts capacitive currents under grounding conditions with comparatively large switching voltages and without restriking, with a distribution of voltage across the interrupters, when both are open, being controlled solely by their own and ground capacitances.
533698
Fetherstonhaugh & Co.
Sachsenwerk Aktiengesellschaft
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