H - Electricity – 01 – H
Patent
H - Electricity
01
H
H01H 33/91 (2006.01) H01H 33/90 (2006.01) H01H 73/18 (2006.01)
Patent
CA 2088546
The gas-blast circuit breaker has passages in the pump piston which connect the pump space to the arcing space and to the surrounding space. These passages are held closed during switching-off and open during switching-on by valve devices. For this purpose, the pump piston is used as a valve seat and the annular disk is used as a valve body which is common to the first valve and to the second valve, the first valve controlling the passage between the pump space and the surrounding space, and the second valve controlling the passage between the pump space and the arcing space. When switching-off large currents, the piston is subjected to an overpressure in the switching-off direction, which overpressure is produced by switching gas flowing into the arcing space, in order to support the drive. The valves are prevented from opening, by means of the pressure in the pump space. During switching-on, the annular disk is raised off the pump piston against the spring prestressing, by means of the reduced pressure in the pump space and the overpressure in the arcing space, in order to connect these two spaces to the surrounding space and to ensure pressure equalization without the drive having to apply more energy during switching-on than in the case of a circuit breaker without an arcing space.
Areva T&d Ag
Gowling Lafleur Henderson Llp
Sprecher Energie Ag
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