Title :
Optical measurement of electric field in transformer oil/pressboard composite insulation system and discussion on charge dynamics
Author :
Hikita, Masayuki ; Sawada, Atsushi ; Kato, Katsumi ; Okubo, Hitoshi
Author_Institution :
Kyushu Inst. of Technol., Kitakyushu, Japan
Abstract :
We measured an electric field in transformer oil/pressboard composite insulation system under dc voltage application using Kerr effect in the oil. When a pressboard was inserted between two parallel-plane electrodes, the electric field between the pressboard and the cathode decreased monotonously with time. On the other hand, the electric field between the pressboard and the anode increased with time, reached a maximum value and then fell down. We discussed this phenomenon by a charge accumulation and potential distribution model considering the difference between the charge accumulation rate on the pressboard of positive and negative charges. Discussion results were also described based on experiment with pressboards changing its thickness and location in the oil. Charge dynamics was also discussed when the polarity of dc voltage was reversed
Keywords :
Kerr electro-optical effect; composite insulating materials; electric field measurement; insulation testing; transformer oil; DC voltage; Kerr effect; charge accumulation; charge dynamics; electric field; optical measurement; parallel-plane electrode; potential distribution; transformer oil/pressboard composite insulation; Anodes; Cathodes; Dielectrics and electrical insulation; Electric variables measurement; Electrodes; Kerr effect; Nonlinear optics; Oil insulation; Petroleum; Power transformer insulation;
Conference_Titel :
Properties and Applications of Dielectric Materials, 1997., Proceedings of the 5th International Conference on
Conference_Location :
Seoul
Print_ISBN :
0-7803-2651-2
DOI :
10.1109/ICPADM.1997.617587
