Ground and test connection for SF.sub.6 insulated bus
AssigneeI-T-E Imperial Corporation
InventorWalter M. Wilson
Life of this patent
Estimating the term…
Abstract
A grounding and test switch for a fully enclosed pressurized gas insulated high voltage system wherein the conductors are completely isolated in an SF.sub.6 or other gas insulating environment. The grounding switch is provided with a contact arm and a movable contact within the enclosure to engage a stationary contact connected to or on the conductor or device inside the enclosure. The contact arm is operable through a gas tight seal from outside the enclosure. The contact arm slides with respect to another stationary contact which provides a direct and positive electrical connection thereto so that the contact arm, when engaged with the first mentioned stationary contact forms a conducting bridge to ground between the first mentioned and second mentioned stationary contact.
Claims7
For use in a metal-enclosed pressurized-gas-insulated high-voltage switchgear system. a double-purpose grounding and test switch assembly capable of grounding high-voltage internal conductor and of permitting a non-grounded electrical connection to the internal conductor for test purposes, said assembly comprising:
- a grounded conductive housing completely surrounding said internal conductor and having an opening provided therein;
- a switch housing mechanically and electrically connected to said grounded conductive housing and having an opening at a first end thereof whereby the pressurized interior of the grounded conductive housing communicates with the interior of said switch housing to maintain an equalized gas pressure therebetween;
- a reciprocating conductive switch blade;
- guide means mounted within said switch housing for guiding said conductive switch blade to move along a substantially linear path and through the grounded conductive housing opening;
- the internal conductor including a jaw blade structure;
- drive means mounted within said switch housing for moving said conductive switch blade from a first position whereby its free end is disengaged from the jaw contact structure to a second position whereby the free end of said conductive switch blade electrically engages the jaw structure;
- a terminal mounted to the free end of said switch housing remote from the grounded conductive housing and electrically insulated therefrom;
- an additional stationary contact;
- said stationary contact being mounted on and forming part of the guide means for said reciprocating conductive switch blade;
- said additional stationary contact being at all times electrically connected to said reciprocating conductive switch blade;
- and permitting free reciprocating movement of said reciprocating conductive switch blade to engage and disengage said jaw structures
- said additional stationary contact being electrically connected to said terminal;
- said guide means also including means for electrically insulating said conductive blade and the stationary contact in which it slides from the grounded conductive housing and said test switch housing;
- said drive means including an actuating shaft having one end thereof extending outwardly from said switch housing to provide for movement of said conductive switch blade from and to a position exterior of said switch housing;
- said terminal being selectively connected to ground potential or to test equipment.
Dependencies are inferred from the claim text.