| 摘要 |
A gas-insulated high-voltage circuit breaker comprises in coaxial arrangement a contact assembly with two contact members (20, 30), an insulating nozzle (40) which is attached to a first (20) of the two contact members (20, 30) and an axially movable annular shield (70) surrounding the insulating nozzle (40). In order to achieve a high availability of the circuit-breaker and to improve its switching performance a control device (80) links the movable annular shield (70) with the first contact member (20). During an opening operation the control device (80) forces the annular shield (70) to move together with the first contact member (20) into the fully open position when the annular shield (70) protrudes over an end of the first contact member (20) facing the second contact member (30). During a closing operation the control device (80) forces the annular shield (70) to move together with the first contact member (20) into the fully closed position when the first contact member (20) protrudes over an end of the annular shield (70) facing the second contact member (30).
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