Can the bubble effect occur in an oil impregnated paper bushing?

Author

Przybylek, P. ; Moranda, H. ; Walczak, K. ; Moscicka-Grzesiak, H.

Author_Institution

Inst. of Electr. Power Eng., Poznan Univ. of Technol., Poznan, Poland

Volume

19

Issue

6

fYear

2012

fDate

12/1/2012 12:00:00 AM

Firstpage

1879

Lastpage

1883

Abstract

This paper elucidates the question whether bubble effect can possibly take place in the insulation of OIP (Oil Impregnated Paper) type of bushings. The investigations were performed on a bushing insulation model and indicated to a possibility that the effect may occur. Presence of metallic screens in the insulation does not limit the development of gas bubbling; they only force the motion of water vapor bubbles along the model axis. The temperature dependence of bubble initiation on the water content in paper part of the bushing insulation is similar to the presented earlier in literature characteristics for bubbling in main insulation of power transformers. The possibility of bubble effect occurrence may explain the relatively frequent cases of transformer bushing failures.

Keywords

bubbles; bushings; fault diagnosis; impregnated insulation; paper; power transformer insulation; OIP insulation; bubble effect; bubble initiation temperature dependence; bushing insulation model; gas bubbling development; metallic screens; oil impregnated paper bushing; power transformer insulation; transformer bushing failures; water content; water vapor bubbles; Aluminum; Electron tubes; Insulators; Oil insulation; Power transformer insulation; Temperature measurement; Transformer bushing; moisturecontent; power transformer insulation;

fLanguage

English

Journal_Title

Dielectrics and Electrical Insulation, IEEE Transactions on

Publisher

ieee

ISSN

1070-9878

Type

jour

DOI

10.1109/TDEI.2012.6396943

Filename

6396943