Yutaka Higashimura
Hitachi
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IEEE Transactions on Electrical Insulation | 1987
Yasuhiko Kako; Kenzo Kadotani; Yutaka Higashimura
In most cases the infinite sequential stressing method can be applied in the analysis of multi-factor aging of insulation systems. Although the simultaneous multi-factor aging characteristics cannot be reproduced strictly by sequential stress tests, the characteristic equation for multi-factor aging can be derived by combining all single-factor aging characteristics in sequential stress aging. Generally, such characteristic equations can be represented only in numerical form, but in the case of mica-epoxy insulation systems in which the value of n in the inverse n-th power law remains unchanged during thermal aging, and also the value of thermal aging rate remains unchanged during voltage aging, the characteristic equations for multi-factor aging can be derived in an analytical form. The mechanical aging characteristics determined by repeated bending tests seem to be of two types, uniform degradation, similar to thermal aging, and local degradation, similar to voltage aging. The ratio of these two types depends on the mica (mica-paper or mica-splitting). Characteristic equations for simultaneous thermal, voltage, and mechanical aging also can be derived by the infinite sequential stressing method. This method assumes an infinite repetition of the four kinds of aging: thermal, voltage, uniform mechanical, and local mechanical.
international symposium on electrical insulating materials | 2008
Kinya Kobayashi; Ryozo Takeuchi; Yutaka Higashimura
Insulation technology is important for supporting the reliability of basic generators, so continuous development of the technology is needed, and various new products may be developed based on this technology.
Archive | 1983
Keiji Fukushi; Yutaka Higashimura; Shinei Huzioka; Syuzou Iwaasa; Kenzo Kadotani
Archive | 1995
Kazuji Yamada; Akira Tanaka; Ryuichi Saito; Yasutoshi Kurihara; Tadao Kushima; Takashi Haramaki; Yoshihiko Koike; Takashi Hosokawa; Mamoru Sawahata; Masahiro Koizumi; Jin Onuki; Kazuhiro Suzuki; Isao Kobayashi; Hideo Shimizu; Yutaka Higashimura; Shigeki Sekine; Nobuya Koike; Hideya Kokubun
Archive | 2007
Yutaka Higashimura; Yoshimi Kurahara; Hiroshi Miyao; Keiji Suzuki; Mitsuru Onoda; Nobuaki Tanaka
Electrical Engineering in Japan | 1992
Yasuhiko Kako; Shigetaka Watanabe; Yutaka Higashimura
Archive | 1983
Keiji Fukushi; Yutaka Higashimura; Shinei Huzioka; Syuzou Iwaasa; Kenzo Kadotani
Archive | 1995
Kazuji Yamada; Akira Tanaka; Ryuichi Saito; Yasutoshi Kurihara; Tadao Kushima; Takashi Haramaki; Yoshihiko Koike; Takashi Hosokawa; Mamoru Sawahata; Masahiro Koizumi; Jin Onuki; Kazuhiro Suzuki; Isao Kobayashi; Hideo Shimizu; Yutaka Higashimura; Shigeki Sekine; Nobuya Koike; Hideya Kokubun
Archive | 1998
Yutaka Higashimura; Koji Ohata; Ryozo Takeuchi; 功治 尾畑; 東村 豊; 良三 武内
Archive | 1995
Hiroshi Miyao; Yutaka Higashimura; Makoto Takamura; Takanori Satoo; Hiroyuki Kamiya; Mitsuru Onoda