Evaluation of compression behaviors of oil-immersed insulating pressed-boards for transformers

Author

Morooka, Hisashi ; Yamagishi, Akira ; Miyahara, Hidekazu ; Sampei, Hiroyuki ; Kashiwakura, Masaru ; Shirasaka, Yukiyasu

Author_Institution

Dept. of Transm. & Distrib., Hitachi Res. Lab., Hitachi, Ltd., Hitachi, Japan

fYear

2012

fDate

23-27 Sept. 2012

Firstpage

1067

Lastpage

1070

Abstract

We report on compression behaviors of oil-immersed insulating pressed-boards used in transformers for analyzing the axial vibration of windings. We examined the compression stress-strain curves of oil-immersed pressed-boards. We found that compression behaviors depended on strain rates and temperatures, that is, viscoelastic behaviors were observed. By applying the time-temperature superposition principle to the pressed-boards´ compression behaviors, we obtained the relationship between the modulus of compressive elasticity and strain rate. As a result, we were able to estimate the pressed-boards´ compression behaviors at high compression forces at high strain rates.

Keywords

stress-strain relations; transformer oil; transformer windings; vibrations; viscoelasticity; compression behaviors; compression forces; compression stress-strain curves; compressive elasticity modulus; oil-immersed insulating pressed-boards; strain rates; time-temperature superposition principle; transformers; viscoelastic behaviors; winding axial vibration; Elasticity; Minerals; Strain; Temperature; Temperature dependence; Temperature measurement; Windings; elctromagnetic force; pressed-board; stress-strain curve; time-temperature superposition principle; transuformer;

fLanguage

English

Publisher

ieee

Conference_Titel

Condition Monitoring and Diagnosis (CMD), 2012 International Conference on

Conference_Location

Bali

Print_ISBN

978-1-4673-1019-2

Type

conf

DOI

10.1109/CMD.2012.6416341

Filename

6416341