H - Electricity – 01 – H
Patent
H - Electricity
01
H
306/230
H01H 33/98 (2006.01) H01H 33/90 (2006.01)
Patent
CA 1266699
Abstract of the Disclosure A gas-blast switch, preferably suitable for switching high voltages, has two arc contacts which can be moved relatively to each other along an axis. Also included are a heating volume and a compression volume concentrically formed around the axis. Quenching gas is compressed in the com- pression volume by means of a compression slider. As soon as the gas pressure is sufficiently high, a part of the quenching gas flows via a back-pressure valve into the heating volume and there assists in blasting an arc drawn between the arc contacts during a switching-off process. The assist is needed a primarily when only small currents are involved in which case only comparatively low quenching gas pressure is developed in the heating volume. The switing-off capacity of the gas-blast switch is increased with simultaneous reduction in the needed actuating energy. This is achieved in that the arc contact of a moving contact member has a discharge duct which extends in axial direction from a free end facing a fixed contact member to another end which opens into the expansion volume. Between the compression volume and expansion volume a device is provided for controlling the pressure and for refilling the quenching gas located in the compression volume.
490952
Bbc Brown Boveri & Company Limited
Swabey Ogilvy Renault
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