Osamu Koyanagi
Hitachi
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Publication
Featured researches published by Osamu Koyanagi.
IEEE Transactions on Power Apparatus and Systems | 1980
Ken Ichi Natsui; Ichiro Nakamura; Osamu Koyanagi; Yoshio Yoshioka; Kunio Hirasawa
An experimental model of one-cycle circuit breaker based on the puffer principle has been developed. This experimental model was designed for 242/245kV 4OkA rating for one break per pole, to meet the ANSI and IEC Standard specifications. Through laboratory tests, it demonstrated minimum and maximum interrupting times of 0.5 and 1.3 cycles for both the 90o short line fault (SLF) and 100o breaker terminal fault (BTF) conditions, including symmetrical and asymmetrical current wave shapes. The experimental one-cycle breaker is furnished with a new type of puffer interrupter which is designed to work under high SF6 gas pressure and has a suction chamber as well as the conventional compression chamber, and provided with a newly developed oil hydraulic operating mechanism with a pilot valve driven by a force motor.
Archive | 1989
Katsuichi Kashimura; Minori Sato; Osamu Koyanagi; Yukio Kurosawa
Archive | 1989
Masanori Tsukushi; Osamu Koyanagi; Yasuharu Seki; Tokio Goto; Yukio Kurosawa
Archive | 1998
Eisaku Mizufune; Yukio Kurosawa; Katsuichi Kashimura; Osamu Koyanagi; Yoshihito Asai; Kogi Ishikawa; Kenichi Natsui; Masanori Tsukushi; Makoto Yano; Goro Daimon; Kenji Tsuchiya
Archive | 1992
Youichi Ohshita; Katuichi Kashimura; Akira Hashimoto; Osamu Koyanagi; Yukio Kurosawa; Isao Nishida
Archive | 1980
Osamu Koyanagi; Kenichi Natsui
Archive | 1992
Osamu Koyanagi; Masanori Tsukushi; Yasuharu Seki; Yukio Kurosawa
Archive | 1981
Kenichi Natsui; Osamu Koyanagi
Archive | 1998
Eisaku Mizufune; Takashi Sato; Katsuichi Kashimura; Osamu Koyanagi; Yoshihito Asai; Yukio Korosawa
Archive | 1997
Eisaku Mizufune; Kenichi Natsui; Yukio Kurosawa; Goro Daimon; Yoshihito Asai; Katsuichi Kashimura; Osamu Koyanagi; Kogi Ishikawa
