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Commercialization of an extra high-voltage nonflammable transformer

✍ Scribed by Kazuhiro Mizuno; Takeshi Sakamoto; Kaoru Endo; Hiroyuki Fujita; Kiyoto Hiraishi

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
892 KB
Volume
116
Category
Article
ISSN
0424-7760

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✦ Synopsis

A perfluorocarbon (PFC)-immersed 275-kV transformer with compressed SF,, gas has been developed. This paper describes the basic cooling and insulation characteristics of PFC, the ac partial discharge voltage, and the aging of PFC-immersed insulation. The results demonstrate that a prototype 275-kV 100-MVA threephase transformer can be operated without any difficulties for an extended period of overvoltage. This prototype has an ac partial discharge initiation strength which is 1.5 times that of the ac test voltage and a lightning impulse breakdown strength which is 1.5 times that of the test voltage. A 275-kV 250-MVA three-phase transformer was built and is being operated at the Abe substation of Chubu Electric Power Co., Inc. The transformer has been operating satisfactorily.

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