Title :
Electrical insulation diagnostic method and maintenance criteria for oil-immersed power transformers
Author :
Okubo, H. ; Kobayashi, S. ; Aoshima, Y. ; Takagi, H. ; Mori, E. ; Ikeda, M. ; Kishi, Akinori
Author_Institution :
Nagoya Univ., Japan
Abstract :
This paper describes the findings of studying some criteria for diagnosis and maintenance control of oil-immersed power transformer through a gas-in-oil analysis, based on the results of sampling and measuring the insulating oils out of 1,324 transformers in practical operation. At the same time, furthermore, this paper summarizes the flow electrification characteristics in a transformer and proposes the limit value of determinant indicators for the charging tendency of an insulating oil and for a leakage current of transformer winding. In addition, a technique to diagnose the insulation degradation of an oil-immersed power transformer was also studied, thereby proposing an operating life determinant criterion
Keywords :
insulation testing; life testing; maintenance engineering; power transformer insulation; transformer oil; charging tendency; determinant indicators; electrical insulation diagnostic method; flow electrification characteristics; gas-in-oil analysis; insulating oils; insulation degradation; leakage current; maintenance control; maintenance criteria; oil-immersed power transformers; operating life determinant criterion; sampling; transformer winding; Dielectrics and electrical insulation; Gas insulation; Leakage current; Oil insulation; Petroleum; Power measurement; Power transformer insulation; Power transformers; Sampling methods; Windings;
Conference_Titel :
Dielectric Liquids, 1999. (ICDL '99) Proceedings of the 1999 IEEE 13th International Conference on
Conference_Location :
Nara
Print_ISBN :
0-7803-4759-5
DOI :
10.1109/ICDL.1999.798951
