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Steep fronts at transient recovery voltages appearing with the interruption of inrush currents of transformers
Author(s) -
Okabe Shigemitsu,
Koto Masanori,
Koshizuka Tadashi,
Nishiwaki Susumu,
Takahashi Nobuyuki,
Saida Toshiyuki,
Yanabu Satoru
Publication year - 2001
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 - 10.1002/1520-6416(20010415)135:1<24::aid-eej4>3.0.co;2-r
Subject(s) - inrush current , circuit breaker , electrical engineering , transformer , overvoltage , emtp , transient recovery voltage , transient (computer programming) , engineering , surge arrester , high voltage , surge , voltage , electric power system , power (physics) , physics , power factor , computer science , quantum mechanics , constant power circuit , operating system
High lightning overvoltages do not appear in underground substations connected to transmission cables. Consequently, it is very important to thoroughly investigate switching overvoltages and to achieve rational insulation coordination for apparatus installed in such underground substations. This paper discusses the occurrence of steep fronts at transient recovery voltages (TRV) appearing at circuit breakers when the inrush currents of transformers are interrupted. Caused by a steep front at the TRV, reignitions occur at circuit breakers, resulting in the generation of high overvoltages with high frequencies. The overvoltages are among the highest switching overvoltages appearing at the terminal of a transformer. The authors clarified the mechanism of the generation of steep fronts at TRV by means of EMTP analysis, as well as by carrying out tests in a high‐power laboratory. © 2001 Scripta Technica, Electr Eng Jpn, 135(1): 24–32, 2001