Insulation system and capacitor

Patent metadata

Field	Value
Publication number	US-11264169-B2
Application number	US-201916448686-A
Country	US
Kind code	B2
Filing date	Jun 21, 2019
Priority date	Jan 3, 2017
Publication date	Mar 1, 2022
Grant date	Mar 1, 2022

Abstract

A capacitor insulation system is disclosed in the present application. The insulation system includes a dielectric fluid containing a first voltage stabilizing additive of a first concentration. The insulation system further includes a dielectric film containing the first voltage stabilizing additive of a second concentration and impregnated in the dielectric fluid. The first concentration is greater than the second concentration. The insulation system prepared according to the present disclosure can provide an increased and quite stable dielectric strength.

First claim

What is claimed is:

1. A capacitor insulation system, comprising:
a dielectric fluid containing a first voltage stabilizing additive of a first concentration; and
a dielectric film containing the first voltage stabilizing additive of a second concentration, wherein the dielectric film is impregnated in the dielectric fluid, and the first concentration of the first voltage stabilizing additive is greater than the second concentration of the first voltage stabilizing additive for increasing a dielectric strength of the insulation system.

2. The capacitor insulation system according to claim 1 , wherein the dielectric fluid further contains at least a second voltage stabilizing additive other than the first voltage stabilizing additive.

3. The capacitor insulation system according to claim 1 , wherein the dielectric film further contains at least a third voltage stabilizing additive other than the first voltage stabilizing additive.

4. The capacitor insulation system according to claim 1 , wherein the dielectric fluid includes oil.

5. The capacitor insulation system according to claim 1 , wherein the dielectric film includes a polymer material.

6. The capacitor insulation system according to claim 5 , wherein the polymer material includes any selected from a group consisting of polypropylene (PP), polyethylene (PE), crosslinked polyethylene (PEX), polyethylene terephthalate (PET), and polycarbonate (PC), polyethylene naphthalate (PEN), polyphenylene sulphide (PPS), polytetrafluoroethylene (PTFE), polyvinylidene difluoride (PVDF), polyamide (PA), polyimide (PI), polyetherimide (PEI), polyvinyl chloride (PVC), polystyrene (PS), cyanoresins, and copolymers thereof.

7. The capacitor insulation system according to claim 1 , wherein the first voltage stabilizing additive includes an antioxidant.

8. The capacitor insulation system according to claim 7 , wherein the antioxidant includes any selected from a group consisting of chain-terminating primary anti-oxidants and hydroperoxide-decomposing secondary anti-oxidants.

9. The capacitor insulation system according to claim 1 , wherein the first voltage stabilizing additive includes an ultraviolet absorber.

10. The capacitor insulation system according to claim 9 , wherein the ultraviolet absorber includes any selected from a group consisting of benzophenone and hindered amine light stabilizer.

11. The capacitor insulation system according to claim 1 , wherein the first concentration is in a range from 1 ppm to 10% by weight.

12. The capacitor insulation system according to claim 11 , wherein the first concentration is in a range from 10 ppm to 5% by weight.

13. The capacitor insulation system according to claim 12 , wherein the first concentration is in a range from 10 ppm to 3% by weight.

14. The capacitor insulation system according to claim 1 , wherein the second concentration is in a range from 1 ppm to 1000 ppm by weight.

15. A capacitor, including:
a first electrode layer;
a second electrode layer; and
an insulation system including a dielectric fluid containing a first voltage stabilizing additive of a first concentration and a dielectric film containing the first voltage stabilizing additive of a second concentration, wherein the dielectric film is impregnated in the dielectric fluid, and the first concentration of the first voltage stabilizing additive is greater than the second concentration of the first voltage stabilizing additive for increasing a dielectric strength of the insulation system; and

wherein the dielectric film is disposed between the first electrode layer and the second electrode layer, and the first electrode layer, the second electrode layer, and the dielectric film are impregnated in the dielectric fluid.

16. The capacitor according to claim 15 , wherein the dielectric fluid further contains at least a second voltage stabilizing additive other than the first voltage stabilizing additive.

17. The capacitor according to claim 16 , wherein the dielectric film further contains at least a third voltage stabilizing additive other than the first voltage stabilizing additive.

18. The capacitor according to claim 15 , wherein the first voltage stabilizing additive includes an ultraviolet absorber.

19. The capacitor according to claim 15 , wherein the first concentration is in a range from 1 ppm to 10% by weight; and
wherein the second concentration is in a range from 1 ppm to 1000 ppm by weight.

20. A method of manufacturing a capacitor, including:
providing a first electrode layer;
providing a second electrode layer; and
providing an insulation system including a dielectric fluid containing a first voltage stabilizing additive of a first concentration, and

a dielectric film containing the first voltage stabilizing additive of a second concentration, wherein the dielectric film is impregnated in the dielectric fluid, and the first concentration of the first voltage stabilizing additive is greater than the second concentration of the first voltage stabilizing additive for increasing a dielectric strength of the insulation system; and
wherein the dielectric film is disposed between the first electrode layer and the second electrode layer, and the first electrode layer, the second electrode layer, and the dielectric film are impregnated in the dielectric fluid.

21. A method for increasing dielectric strength of a capacitor, including:
providing a first electrode layer;
providing a second electrode layer; and
providing an insulation system, the insulation system including:
a dielectric fluid containing a first voltage stabilizing additive of a first concentration; and
a dielectric film containing the first voltage stabilizing additive of a second concentration and wherein the dielectric film is impregnated in the dielectric fluid, and the first concentration of the first voltage stabilizing additive is greater than the second concentration of the first voltage stabilizing additive for increasing the dielectric strength of the insulation system;

wherein the dielectric film is disposed between the first electrode layer and the second electrode layer, and the first electrode layer, the second electrode, and the dielectric film are impregnated in the dielectric fluid.

Assignees

• Hitachi Energy Switzerland Ag

Inventors

• Qi Lejun
• Wang Yang
• Li Nan
• Guan Yu
• Chen Jiansheng

Classifications

• H01G4/04

  Liquid dielectrics · CPC title

• H01G2/14

  Protection against electric or thermal overload (by cooling H01G2/08) · CPC title

• H01G4/22

  impregnated · CPC title

• H01G4/18 Primary

  of synthetic material, e.g. derivatives of cellulose (H01G4/16 takes precedence) · CPC title