Electric bushings having insulation medium retention seals

Patent metadata

Field	Value
Publication number	US-10032546-B2
Application number	US-201514947100-A
Country	US
Kind code	B2
Filing date	Nov 20, 2015
Priority date	Nov 20, 2014
Publication date	Jul 24, 2018
Grant date	Jul 24, 2018

Abstract

Systems and methods for providing electrical bushings for maintaining a seal during severe incidents are provided. The bushings provide for relatively large gap formations and seal spacings by using one or more self-modulating seals. In certain configurations, the bushings provide for relatively large gap formations and seal spacings by using a wider or narrow top portion adjacent to a relatively narrower middle portion. The systems and methods can be also applied to other apparatus when deemed proper.

First claim

What is claimed is:

1. An electrical bushing assembly, comprising:
a bushing insulator;
a flange housing;
a bumper between the busing insulator and the flange housing;
a bushing medium disposed within the bushing insulator and the flange housing for fluid communication therebetween; and
a self-modulating seal sealingly engaging a first portion of the bushing insulator to a second portion of the flange housing in a fluid/gas tight manner.

2. The electrical bushing assembly of claim 1 , wherein the electrical bushing assembly is sufficient to withstand IEEE 693-2005 shake table tests conducted at 2.5 g Zero Period Acceleration (ZPA).

3. The electrical bushing assembly of claim 1 , wherein the first and second portions are vertical surfaces.

4. The electrical bushing assembly of claim 1 , wherein the bushing insulator is selected from the group consisting of an upper bushing insulator, a lower bushing insulator, and combinations thereof.

5. The electrical bushing assembly of claim 1 , wherein the self-modulating seal seals the bumper from the bushing medium.

6. The electrical bushing assembly of claim 1 , wherein the bumper is immersed in the bushing medium.

7. The electrical bushing assembly of claim 1 , wherein the bumper is positioned between horizontal surfaces of the bushing insulator and the flange housing.

8. The electrical bushing assembly of claim 1 , wherein the first portion is larger than the second portion so that the bushing insulator surrounds the flange housing.

9. The electrical bushing assembly of claim 1 , wherein the self-modulating seal is an internal seal such that the first and second portions are internal surfaces.

10. The electrical bushing assembly of claim 9 , wherein the self-modulating seal has a planar surface in contact with the bushing medium.

11. The electrical bushing assembly of claim 9 , further comprising a groove on at least one of the first and second surfaces, the self-modulating seal being received in the groove.

12. An electrical bushing assembly, comprising:
a bushing insulator;
a flange housing;
a bushing medium disposed within the bushing insulator and the flange housing for fluid communication therebetween; and
a self-modulating seal sealingly engaging a first portion of the bushing insulator to a second portion of the flange housing in a fluid/gas tight manner, wherein the second portion is larger than the first portion so that the flange housing surrounds the bushing insulator.

13. The electrical bushing assembly of claim 1 , wherein the self-modulating seal is at least one of an internal seal such that the first and second portions are internal surfaces and an external seal such that the first and second portions are external surfaces.

14. The electrical bushing assembly of claim 13 , wherein the self-modulating seal is adhered to at least one of the first and second portions.

15. An electrical bushing assembly, comprising:
a bushing insulator;
a flange housing;
a bushing medium disposed within the bushing insulator and the flange housing for fluid communication therebetween; and
a self-modulating seal sealingly engaging a first portion of the bushing insulator to a second portion of the flange housing in a fluid/gas tight manner,
wherein the self-modulating seal is an internal seal such that the first and second portions are internal surfaces, and
wherein the self-modulating seal has a notched surface in contact with the bushing medium.

16. An electrical bushing assembly, comprising:
a bushing insulator;
a flange housing;
a bushing medium disposed within the bushing insulator and the flange housing for fluid communication therebetween;
a self-modulating seal sealingly engaging a first portion of the bushing insulator to a second portion of the flange housing in a fluid/gas tight manner, wherein the self-modulating seal is an internal seal such that the first and second portions are internal surfaces, and
a second self-modulating seal sealingly engaging an outer surface of the bushing insulator to an outer surface of the flange housing in a fluid/gas tight manner.

17. The electrical bushing assembly of claim 16 , wherein the second self-modulating seal is adhered to at least one of the outer surfaces of the bushing insulator and the flange housing.

18. An electrical bushing assembly, comprising:
a flange housing having a groove on a first outer vertical surface;
an upper bushing insulator having an inner vertical surface that surrounds the groove;
a bushing medium disposed within the bushing insulator and the flange housing for fluid communication therebetween;
an internal self-modulating seal in the groove and sealingly engaging the first vertical outer surface of the flange housing to the inner vertical surface of the upper bushing insulator in a fluid/gas tight manner, the internal self-modulating seal have a notched surface in contact with the bushing medium;
an external self-modulating seal sealingly engaging a vertical outer portion of the upper bushing insulator to a second vertical outer portion of the flange housing in a fluid/gas tight manner; and
a bumper between horizontal surfaces of the busing insulator and the flange housing, wherein the internal self-modulating seal seals the bumper from the bushing medium.

19. The electrical bushing assembly of claim 18 , wherein the electrical bushing assembly is sufficient to withstand IEEE 693-2005 shake table tests conducted at 2.5 g Zero Period Acceleration (ZPA).

Assignees

• Hubbell Inc

Inventors

• Weatherbee Eric Ralph
• Mcnulty Andrew Victor
• Zhang Shibao
• Ko Chungduck

Classifications

• H01B17/34

  Insulators containing liquid, e.g. oil · CPC title

• H01B17/301 Primary

  Sealing of insulators to support · CPC title