| 摘要 |
In order considerably to reduce the drive energy for SF6 switches with autocompression of the extinguishing gas, the procedure is as follows: initially, two compression spaces which are in general different are produced. Then, when a switch-off occurs in a first compression space, the extinguishing gas is compressed at the same time as the switching-off movement. The magnitude of this first compression is, however, still relatively small. A second compression space does not become involved in the compression of the extinguishing gas until shortly before the minimum extinguishing distance, that is to say delayed in time with respect to the start of the switching movement. At the same time, kinetic energy is transformed into potential energy. This is caused by, for example, longitudinal gaps in the wall of the second compression space. The start of the main compression can be controlled by the length of these gaps. Towards the end of the compression movement in the second compression space, the associated compression piston latches firmly onto the wall of this space. In consequence, the switch drive is relieved of stress from the compression pressure. In one embodiment variation, the controllable gas outlet is implemented by means of an annular gap between the gas outlet tube (3) and the wall of the opening in the base of the compression cylinder (1). <IMAGE>
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