Impregnation of air core reactors

Patent metadata

Field	Value
Publication number	US-9403185-B2
Application number	US-201214241118-A
Country	US
Kind code	B2
Filing date	Jun 27, 2012
Priority date	Aug 31, 2011
Publication date	Aug 2, 2016
Grant date	Aug 2, 2016

Abstract

The invention relates to a process for the impregnation of air core reactors or parts of air core reactors and impregnated air core reactors or parts thereof obtainable by said process.

First claim

The invention claimed is:

1. A process for the impregnation of an air core reactor or a part of an air core reactor comprising the following steps:
i) providing an air core reactor or a part of an air core reactor,
ii) applying an impregnation system to the air core reactor or the part of the air core reactor wherein said impregnation system comprises
a) a component comprising one or more epoxy group(s),
b) a flexibilizer selected from the group consisting of a polyoxyalkylene, a polyether-polyamine and a mixture thereof,
c) dicyandiamide; and
d) an accelerator selected from the group consisting of an imidazole, an imidazole derivative, a urea derivative and a mixture thereof,
iii) curing the impregnated air core reactor or the impregnated part of the air core reactor.

2. The process according to claim 1 , wherein the part of the air core reactor is a coil.

3. The process according to claim 1 , wherein the a) component is a compound having an average epoxy functionality of at least two.

4. The process according to claim 3 , wherein the a) component is a polyglycidylether of a polyhydric alcohol.

5. The process according claim 1 , wherein the flexibilizer is a polypropylene glycol or polyethylene glycol.

6. The process according to claim 1 , wherein the flexibilizer is present in an amount ranging from 40 to 70 wt. %, based on the amount of the sum of components b), c) and d).

7. The process according to claim 1 , wherein the dicyandiamide is present in an amount ranging from 25 to 45 wt. %, based on the amount of the sum of components b), c) and d).

8. The process according to claim 1 , wherein the accelerator is present in an amount ranging from 5 to 25 wt. %, based on the amount of the sum of components b), c) and d).

9. The process according to claim 1 , wherein the weight ratio of component a) to the sum of components b), c) and d) ranges from 20:1 to 2:1.

10. The process according to claim 1 , wherein the impregnation system is applied to the air core reactor or the part of the air core reactor as a two component system of
A) composition A comprising at least component a) and
B) composition B comprising at least component b), c) and d).

11. The process according to claim 1 , wherein the curing in step iii) is carried out at a temperature higher than 120° C.

12. The process according to claim 1 wherein the impregnation is carried out as a trickle impregnation or a vacuum pressure impregnation.

13. An impregnated air core reactor or part of an air core reactor obtained by the process according to any of claim 1 .

Assignees

• Beigel Astrid
• Beisele Christian
• Massen Ulrich
• Huntsman Int Llc

Inventors

• Beigel Astrid
• Beisele Christian
• Massen Ulrich

Classifications

• H01F30/08

  without magnetic core · CPC title

• H01F27/28

  Coils; Windings; Conductive connections · CPC title

• H01F27/00

  Details of transformers or inductances, in general · CPC title

• C09D163/00

  Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins · CPC title

• C08K5/06

  Ethers; Acetals; Ketals; Ortho-esters · CPC title