Conical composite SF.sub.6 high voltage bushing with floating shield
First Claim
1. A high voltage bushing having a hollow elongated insulative housing such that a high voltage conductor can be longitudinally disposed within said housing, the bushing comprising:
- a ground shield disposed within said housing for substantially shielding a base section of said housing;
a floating shield disposed within said housing for substantially shielding a middle section of said housing;
a support means at least partly disposed between said ground shield and said housing for supporting said floating shield; and
means for connecting said floating shield to said support means at a location within said housing in which the electrical stress is substantially lower than the electrical stress in unshielded areas of the base and middle sections of the bushing.
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Accused Products
Abstract
The present invention provides a floating shield for a high voltage bushing. Preferably the bushing is conically shaped and has a composite housing for substantially optimizing the electrical performance of the bushing according to the invention. The floating shield is preferably suspended within the bushing housing by a supporting insulator placed in a low electrical stress region of the bushing. In a preferred embodiment, the supporting insulator is disposed between a ground grading shield and the bushing housing. The composite housing preferably provides a protective inner tube made of a fiber reinforced material and an outer silicone rubber housing having weather sheds formed in a helix on the surface of the housing.
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Citations
18 Claims
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1. A high voltage bushing having a hollow elongated insulative housing such that a high voltage conductor can be longitudinally disposed within said housing, the bushing comprising:
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a ground shield disposed within said housing for substantially shielding a base section of said housing; a floating shield disposed within said housing for substantially shielding a middle section of said housing; a support means at least partly disposed between said ground shield and said housing for supporting said floating shield; and means for connecting said floating shield to said support means at a location within said housing in which the electrical stress is substantially lower than the electrical stress in unshielded areas of the base and middle sections of the bushing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A composite shielded gas bushing for protecting a high voltage interface formed by a conductor connected between a switch and a high voltage circuit, comprising:
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a hollow tube having a base opening and a top opening, said conductor capable of passing through said openings; an insulative housing surrounding said hollow tube; a conductive shield disposed within said hollow tube for shielding said insulative housing from the base of said hollow tube to a predetermined point corresponding to a middle section of the housing; and a support member connected to said conductive shield at a location within said housing in which electrical stress is substantially lower than the electrical stress in the unshielded areas in said bushing between said base opening and said predetermined point. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification