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Development and practical operation of perfluorocarbon immersed 275kV transformers with compressed SF6 gas insulation

Journal Article · · IEEE Transactions on Power Delivery
DOI:https://doi.org/10.1109/61.400842· OSTI ID:64428
; ; ; ;  [1];  [2]; ; ;  [3]
  1. Hitachi Ltd. (Japan)
  2. Kyushu Kyoritu Univ., Kitakyushu (Japan)
  3. Chubu Electric Power Co., Inc., Nagoya (Japan)
+ Show Author Affiliations
A perfluorocarbon (PFC) immersed 275kV transformer with compressed SF6 gas insulation has been under development. This paper clarified the AC partial discharge inception voltage and time characteristics of PFC immersed insulation and also clarified that a prototype 275kV 100MVA three phase transformer could be worked without any trouble during the long-term over voltage test. This prototype proved that it had the AC partial discharge inception strength of higher than 1.5 times of the AC test voltage and the lightning impulse breakdown strength of 1.5 times of the test voltage. A 275kV 250MVA three phase transformer was developed and practically operated at the outdoor substation of Chubu Electric Power Co., Inc. This transformer has been successfully operated until now and the detailed internal inspection of the transformer was carried out after one year and 9 months of the successful practical operation and no significant abnormal condition was recognized.
OSTI ID:
64428
Report Number(s):
CONF-940702--
Journal Information:
IEEE Transactions on Power Delivery, Journal Name: IEEE Transactions on Power Delivery Journal Issue: 2 Vol. 10; ISSN ITPDE5; ISSN 0885-8977
Country of Publication:
United States
Language:
English

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Related Subjects

24 POWER TRANSMISSION AND DISTRIBUTION
COOLING
GAS-INSULATED TRANSFORMERS
PERFORMANCE
POWER SUBSTATIONS
RELIABILITY
SULFUR FLUORIDES