Title :
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
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;
Conference_Titel :
Condition Monitoring and Diagnosis (CMD), 2012 International Conference on
Conference_Location :
Bali
Print_ISBN :
978-1-4673-1019-2
DOI :
10.1109/CMD.2012.6416341
