Condenser core with grounded conductive foils in a capacitive layer

Patent metadata

Field	Value
Publication number	US-12374473-B2
Application number	US-202017778467-A
Country	US
Kind code	B2
Filing date	Oct 27, 2020
Priority date	Nov 20, 2019
Publication date	Jul 29, 2025
Grant date	Jul 29, 2025

Abstract

The present disclosure relates to a condenser core configured for surrounding an electrical conductor. The condenser core includes an insulation material and a plurality of electrically conducting capacitive layers for modifying electrical fields formed by a current flowing in the electrical conductor. At least one of the electrically conducting capacitive layers includes a first foil and a second foil. Each of the first and second foils of an outermost capacitive layer is connected with a grounding arrangement for grounding the foils.

First claim

The invention claimed is:

1. A condenser core configured for surrounding an electrical conductor, the condenser core comprising an insulation material and a plurality of electrically conducting capacitive layers for modifying electrical fields formed by a current flowing in the electrical conductor;
wherein at least one of the electrically conducting capacitive layers comprises a first foil and a second foil, wherein the first and second foils are overlapping by an overlap at a first edge of the first foil and a second edge of the second foil,
wherein each of the first and second foils of an outermost capacitive layer is connected with a respective grounding arrangement for grounding the foils,
wherein the first foil and the second foil are arranged to provide that respective longitudinal edges of the foils have a length corresponding to the first and second foils,
wherein the first and second foils are of equal length,
wherein the first and second foils are arranged such that the overlap is at respective longitudinal edges of the foils, wherein the first and second foils are partially electrically connected based on an electrically insulating fluid that is pressed between the first foil and the second foil, and
wherein a length of a sheet formed by the overlapping first and second foils of the capacitive layer is greater than the length of the first and second foils.

2. The condenser core of claim 1 , wherein the respective grounding arrangement comprises a measuring tap.

3. The condenser core of claim 1 , wherein the overlap comprises a joint via which the first and second foils are electrically connected.

4. The condenser core of claim 3 , wherein the joint comprises a conductive adhesive.

5. An electrical device comprising the condenser core of claim 4 .

6. An electrical device comprising the condenser core of claim 1 .

7. The electrical device of claim 6 , wherein the electrical device comprises a bushing.

8. The electrical device of claim 7 , further comprising the electrical conductor passing through the condenser core.

9. The electrical device of claim 7 , further comprising the electrical conductor passing through the condenser core.

10. The electrical device of claim 6 , further comprising the electrical conductor passing through the condenser core.

11. The electrical device of claim 6 , wherein the electrical device comprises a cable termination.

12. The condenser core of claim 1 , wherein the overlap comprises a joint via which the first and second foils are electrically connected.

13. The condenser core of claim 1 , wherein the overlap comprises a joint via which the first and second foils are electrically connected.

14. The condenser core of claim 1 , wherein the overlap comprises a joint via which the first and second foils are electrically connected.

15. The electrical device of claim 1 , wherein a separation between the first foil and the second foil is less than 5 mm less than a width of the overlap.

Assignees

• Hitachi Energy Ltd

Inventors

• Kanje-Nordberg Jens
• Sjöberg Peter
• Johansson Kenneth

Classifications

• H01G4/242

  the capacitive element surrounding the terminal · CPC title

• H01G4/16

  of fibrous material, e.g. paper · CPC title

• H01B17/28 Primary

  Capacitor type · CPC title

• H01G4/32

  Wound capacitors · CPC title

• H01G4/35 Primary

  Feed-through capacitors or anti-noise capacitors · CPC title