Masaru Okamoto
Toshiba
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Publication
Featured researches published by Masaru Okamoto.
IEEE Transactions on Power Delivery | 1991
Masaru Okamoto; Masayuki Ishikawa; Katsumi Suzuki; Hisatoshi Ikeda
To analyze hot-gas flow in puffer-type gas circuit breakers (GCBs), a program was developed by adding functions for dealing with opening process, gas compression, and arcing to a program for the analysis of axially symmetric compressive fluids. The accuracy of the program is demonstrated by comparing the results of computation by this program with the results of two different tests: the observation of hot-gas backflows using the Schlieren method and the measurement of breakdown voltage drops resulting from hot gas generated by current interruptions. The results of both tests show trends similar to calculated results obtained by simulating the tests, proving that this program is applicable to interruption phenomena associated with hot gas to a certain extent. The program is applied to the calculation of pressure rise phenomena in a puffer chamber caused by hot-gas backflows and dielectric strength to ground in a tank-type GCB. The program is expected to be useful as a means of estimating test results. >
Archive | 1989
Hideo Okuma; Masaru Okamoto; Kumi Okuwada; T. Fujioka; Koji Higashibata; Hironori Suzuki
Meander-shaped superconductive ceramics, YBa2Cu3O7-x, with 30 cm in length were fabricated from green sheets by the doctor blade method. These ceramics were sintered and provided with electrode leads to make superconductive current limiting device (CLD).
Archive | 1990
Masaru Okamoto; Hitoshi Mizoguchi; Masayuki Ishikawa; Hisatoshi Ikeda; Katsumi Suzuki; Susumu Nishiwaki; Tsuneharu Teranishi; Satoru Yanabu; T. Fujioka
Archive | 1999
Tatsuaki Sato; Shinya Miyamoto; Masumitsu Toyohara; Masaru Okamoto; Yoshinari Takamatsu
Archive | 1989
Masaru Okamoto; Noriyuki Takahashi; Hitoshi Mizoguchi; Satoru Yagiu
Archive | 1998
Yoshio Ishimori; Masaru Okamoto; Tatsuaki Sato; Naomi Toyohara; 龍明 佐藤; 優 岡本; 義雄 石森; 尚実 豊原
Electrical Engineering in Japan | 1990
Hisatoshi Ikeda; Masaru Okamoto; Masayuki Ishikawa; Satoru Yanabu
Archive | 1999
Masaru Okamoto; K. Okamura; Choji Yamazaki; Hiroyuki Yasui
Archive | 2003
Masaru Okamoto; K. Okamura; Choji Yamazaki
The transactions of the Institute of Electrical Engineers of Japan.B | 1988
Hisatoshi Ikeda; Masaru Okamoto; Masayuki Ishikawa; Satoru Yanabu