| 摘要 |
A metal-clad, compressed gas-blast circuit-breaker (1) with a gas-filled housing (2) and with an interrupter unit (3), which is supported, insulated in the housing (2), has at least one insulating drive rod (26) coupled to the switching contact (20) to actuate a movable switching contact (20). This drive rod (26), which is connected to the interrupter unit (3), extends through a controlling element (5), which takes up and guides the flow of the switching gases at the time of the switching-off operation, as well as through a hollow post insulator (4) connected to the controlling element (5). The controlling element (5) allows only a portion of the switching gases to pass through in the direction of at least one drive rod (26) and diverts the remaining portion in an at least radial direction. In this manner, the pressurization of the drive rod (26) and the post insulator (4) by the switching gases is reduced. The circuit-breaker is especially suited for application in gas-insulated, metal-clad, high-voltage switching stations.
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