| 摘要 |
In an electric high-voltage circuit breaker with a hydraulic drive, the piston rod, going through a seal, is brought out of the hydraulic cylinder in order to actuate the movable contact via a reversing gear and a switching rod. The piston rod is arranged in a protective tube and provided with a guiding ring which guides the piston rod in the protective tube. The piston rod is coupled to a fork head which engages the reversing gear. The hydraulic cylinder is located between two housings for drive parts, the interior spaces of which are heated and ventilated or exhausted. To prevent the formation of condensate water in the interior of the protective tube, there are provided in the hydraulic cylinder passages which connect the interior of the lower housing and the interior of the upper housing, respectively, to the interior of the protective tube. Thereby, the heated air is conducted from the lower housing via the interior of the protective tube into the interior of the upper housing. The electric high-voltage circuit breaker may be of the type using SF6 pressurized gas in an open air installation.
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