Title :
The effects of insulator structure and insulating oil to charge accumulation in oil-immersed transformers
Author :
Wakamatsu, M. ; Kato, K. ; Koide, H. ; Okubo, H.
Author_Institution :
Dept. of Electr. Eng., Nagoya Univ., Japan
Abstract :
We directly measured the electric field in transformer oil/pressboard (PB) system under dc voltage using an electro-optic method by Kerr effect. We measured time variations and spatial distributions of electric field in the insulating oil. We measured them in both fresh oil/PB and degraded oil/PB composite systems to clarify the effect of material characteristics. Additionally, we changed the PB arrangement to investigate the effect of the PB insulator structure. We obtained the time decaying characteristics in the electric field distribution. From the results, we discussed physical mechanism of the charge accumulation.
Keywords :
Kerr electro-optical effect; composite insulators; composite materials; insulating oils; power transformers; Kerr effect; charge accumulation; electric field; electro-optic method; insulating oil; insulator structure; oil-immersed transformers; oil-pressboard composite systems; Composite materials; Degradation; Dielectrics and electrical insulation; Electric variables measurement; Interconnected systems; Kerr effect; Oil insulation; Petroleum; Power transformer insulation; Time measurement;
Conference_Titel :
Properties and Applications of Dielectric Materials, 2003. Proceedings of the 7th International Conference on
Print_ISBN :
0-7803-7725-7
DOI :
10.1109/ICPADM.2003.1218456
