Bushing with a tap assembly

Patent metadata

Field	Value
Publication number	US-11270817-B2
Application number	US-201916982224-A
Country	US
Kind code	B2
Filing date	Mar 22, 2019
Priority date	Mar 22, 2018
Publication date	Mar 8, 2022
Grant date	Mar 8, 2022

Abstract

A bushing including: a bushing comprising: a bushing body, an electrode contained in the bushing body, a flange body mounted to the bushing body, a tap assembly including: a hollow electrically conductive sleeve portion extending from the flange body, a conductor connected to the electrode and extending from the electrode into the sleeve portion, a pin connected to the conductor, an insulating body provided around the conductor in the sleeve portion, and an electrically conductive lid configured to be assembled with the sleeve portion, the lid having a cap portion and a hollow cylindrical extension portion, wherein the cap portion is configured to receive an end portion of the pin, wherein the extension portion extends axially from the cap portion and is configured to be received by the sleeve portion, and wherein the extension portion is configured to surround the insulating body in the sleeve portion when the lid is assembled with the sleeve portion.

First claim

The invention claimed is:

1. A bushing comprising:
a bushing body,
an electrode contained in the bushing body,
a flange body mounted to the bushing body, wherein the flange body is grounded during normal operation of the bushing,
a tap assembly comprising:
a hollow electrically conductive sleeve portion extending from the flange body,

a conductor connected to the electrode and extending from the electrode into the sleeve portion,
a pin connected to the conductor,
an insulating body provided around the conductor in the sleeve portion, and
an electrically conductive lid configured to be assembled with the sleeve portion,

the lid having a cap portion and a hollow cylindrical extension portion, wherein the pin is configured to be in mechanical contact with the cap portion,
wherein the cap portion is configured to receive an end portion of the pin,
wherein the extension portion extends axially from the cap portion and is configured to be received by the sleeve portion, and wherein the extension portion is configured to surround the insulating body in the sleeve portion when the lid is assembled with the sleeve portion,
wherein in the sleeve portion the insulating body is arranged at a radial distance from the inner surface of the sleeve portion, whereby a chamber is formed therebetween, wherein the extension portion is configured to extend inside the chamber from a lid end of the chamber and along at least half of the length of the chamber, or along at least two thirds of the length of the chamber, or along at least three fourths of the length of the chamber, and
wherein the extension portion has a free end arranged in the sleeve portion when the lid is assembled with the sleeve portion, and wherein the external surface of the extension portion is arranged at a distance from the inner surface of the sleeve portion along the entire axial extension of the sleeve portion.

2. The bushing as claimed claim 1 , wherein the extension portion has an external surface which follows the profile of the inner surface of the sleeve portion in the axial direction, and wherein the extension portion has an inner surface which follows the profile of the external surface of the insulating body in the axial direction.

3. The bushing as claimed in claim 1 , wherein the extension portion fills a majority of the chamber.

4. The bushing as claimed in claim 1 , wherein the mechanical contact between the pin and the cap portion is in the radial direction.

5. The bushing as claimed in claim 1 , wherein the mechanical contact between the pin and the cap portion is in the axial direction.

6. The bushing as claimed in claim 1 , wherein the cap portion has a pin opening configured to receive the pin, wherein the pin opening has an inner surface which in the axial direction is essentially parallel with the external surface of the pin when the pin is received by the cap portion.

7. The bushing as claimed in claim 1 , wherein the lid comprises an insert assembly and the cap portion has an insert assembly opening configured to receive the insert assembly, wherein the insert assembly comprises a plunger having a plunger opening configured to receive the end portion of the pin, wherein the plunger is configured to mechanically contact the end portion of the pin, and wherein the insert assembly comprises a resilient member configured to bias the plunger axially in the insert assembly opening towards a bottom surface of the insert assembly opening to provide mechanical contact between the plunger and the cap portion.

8. The bushing as claimed in claim 7 , wherein the resilient member is arranged in the plunger opening, and configured to bear against an end face of the pin.

9. The bushing as claimed in claim 7 , wherein an inner surface of the plunger opening is provided with at least one radially resilient contact element configured to provide mechanical contact between the plunger and the pin.

10. The bushing as claimed in claim 1 , wherein the lid is provided with first threads and the inner surface of the sleeve portion is provided with second threads configured to cooperate with the first threads to thereby connect the lid with the sleeve portion.

Assignees

• Hitachi Energy Switzerland Ag

Inventors

• Sjöberg Peter
• Edberg Björn
• Johansson Kenneth
• Börjesson Jan-Åke

Classifications

• H01B17/28 Primary

  Capacitor type · CPC title

• H02G15/072

  of the condenser type · CPC title

• H01F27/04

  Leading of conductors or axles through casings, e.g. for tap-changing arrangements · CPC title