| 摘要 |
A grounding switch for gas-insulated, metal-enclosed high voltage switchgear in which a movable switch contact, in permanent connection with the grounded enclosure of the switchgear, and a movable counter contact at high potential, mounted on at least one phase conductor of the switchgear, are moved relatively into respective OFF and ON-positions by an operating device, with the movable switch contact in non-contacting and contacting relationship, respectively, with the movable counter contact. A metal screen surrounds the phase conductor in the region thereof where the movable counter contact is mounted. The movable counter contact is centrally mounted in the metal screen and is displaced from the screen towards the movable switch contact during closing of the contact elements to the ON-position. The movable counter contact is retracted within the screen in the OFF-position. The movable counter contact includes an elevated portion for enhancing the control of flash-over such that it occurs between the movable switch contact and the elevated portion. In a modified embodiment the movable counter contact is independently operated by a second operating device, but in synchronism with the operation of the first operating device.
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