H - Electricity – 01 – H
Patent
H - Electricity
01
H
306/234
H01H 33/91 (2006.01) H01H 33/90 (2006.01) H01H 33/76 (2006.01)
Patent
CA 1119221
?510 INVENTORS: HANS-RUDOLF W?THRICH, HUBERT SPIEGEL, HERMANN LEHNER and PETER KREBS INVENTION: GAS-BLAST SWITCH ABSTRACT OF THE DISCLOSURE A movable, tubular-shaped contact element is displace- ably guided in a partition wall subdividing the internal space of the gas-blast switch housing into an extinguishing chamber and an expansion chamber. During the cut-off stroke a current connection prevails by means of this contact element between both of the chambers or compartments. The contact element coacts with a sta- tionary or fixed contact set having a rim of rated current con- tacts which, in the cut-on position, engage about the contact ele- ment. Further, there is provided a burn-off ring which is elec- trically connected with the contact element and has an electrical- ly insulated, suspended intermediate electrode which, in the cut- on position, engages into the contact element or piece. The lat- ter, during the cut-off stroke, initially comes out of engagement with the rated current contacts and first thereafter comes out of engagement with the intermediate electrode. In order to ensure that the part of the switching arc which burns between the burn- off ring and the intermediate electrode remains at this location and that its other part, even in the presence of low currents, is sufficiently blown, the burn-off ring is arranged within the rim of rated current contacts and is rearwardly inset with respect to the contact surfaces thereof, and furthermore, a pump device is coupled with the movable contact element. This pump device, du- ring the cut-off stroke, conveys extinguishing gas out of the re- gion of the extinguishing chamber which is remote from the sepa- ration path to the separation path.
349974
Krebs Peter
Lehner Hermann
Spiegel Hubert
Wuthrich Hans R.
Gowling Lafleur Henderson Llp
Sprecher & Schuh Ag
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