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Dielectric characteristics of oil‐filled transformer in the presence of nonstandard lightning surge waveforms
Author(s) -
Okabe Shigemitsu,
Kawashima Takeshi,
Inoue Tamotsu,
Teranishi Tsuneharu,
Nagaoka Satoshi
Publication year - 2004
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.10229
Subject(s) - waveform , impulse (physics) , surge , electrical engineering , voltage , impulse generator , transformer , transformer oil , engineering , dielectric strength , breakdown voltage , surge arrester , lightning arrester , acoustics , materials science , physics , quantum mechanics
To achieve a rational insulation design for transformers, it is important to evaluate dielectric strength against surges actually impinging on equipment on‐site. This paper deals with the breakdown voltage characteristics of an oil gap under nonstandard lightning surge waveforms combined with oscillatory voltages. It is found that the breakdown voltages of the oil gap under nonstandard impulse waveforms are higher than standard lightning impulse voltages. The results can be ascribed to V–t characteristics of the oil gap in short‐time impulse voltage ranges. © 2003 Wiley Periodicals, Inc. Electr Eng Jpn, 146(3): 39–45, 2004; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.10229