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Electrical Engineering in Japan | 2000

A diagnostic method based on RVM (return voltage measurement) for condenser bushings with oil–paper insulation systems

Shigemitsu Okabe; Michio Yamada; Shigekatsu Sato; Etsunori Mori

The bushing of a transformer is one part of the transformer system, but is as vital as the transformer itself because it forms a part of the main circuit. Deterioration and abnormal condition of the bushing possibly cause its destruction, shortage of the main circuit to the Earth, and fire in the systems, so that diagnosis of the bushings is thus very important. At present, mainly visual inspection from outside of the bushing is carried out. Inspection of the inside condition of the bushing by dissolved gas analysis of the inside oil is done only as sampling for selected bushings because it is difficult due to the sealed construction of the bushings. Therefore, a simple diagnostic method for bushings has been expected for a long time. In Eastern Europe, the RVM (Return Voltage Measurement) method based on scanning the polarization spectra was applied to the oil–paper insulation systems inside the transformer as a diagnostic method. In this paper we investigate theoretically the principle of the RVM method applied to bushings with the same oil–paper insulation systems as the transformer by using the equivalent circuit, and the possibility of using this novel diagnostic method for condenser-type bushings is demonstrated by a model experiment.


Archive | 2000

Cheese and its production

Hiroshi Imai; Isahiro Kawasaki; Akira Kimura; Yoshihiko Miyagawa; Shigekatsu Sato; 宏 今井; 重勝 佐藤; 美彦 宮川; 功博 川崎; 彰 木村


Archive | 2006

Electron Beam Irradiation Method, Electron Beam Irradiation Apparatus, and Electron Beam Irradiation Apparatus for Open-Mouthed Container

Shiro Eguchi; Isao Hashimoto; Shigekatsu Sato; Hidenobu Koide; Nobuyuki Hashimoto; Takayuki Suzuki; Satoru Gozaki; Tomoyuki Hikosaka; Yukio Okamoto; Hiroyuki Fujita


Archive | 2006

Electron beam vacuum apparatus for sterilising containers

Shiro Eguchi; Isao Hashimoto; Shigekatsu Sato; Hidenobu Koide; Nobuyuki Hashimoto; Takayuki Suzuki; Satoru Gozaki; Tomoyuki Hikosaka; Yukio Okamoto; Hiroyuki Fujita


Archive | 2007

Method and device for radiating electron beam

Shiro Eguchi; Isao Hashimoto; Nobuyuki Hashimoto; Hidenobu Koide; Shigekatsu Sato; Takayuki Suzuki; 重勝 佐藤; 英延 小出; 信行 橋本; 橋本 勲; 志郎 江口; 崇之 鈴木


Archive | 2006

Electron beam irradiation device for open container

Shiro Eguchi; Hiroyuki Fujita; Isao Hashimoto; Tomoyuki Hikosaka; Satoshi Kowazaki; Yukio Okamoto; Shigekatsu Sato; Takayuki Suzuki; 重勝 佐藤; 行夫 岡本; 智 強崎; 知行 彦坂; 橋本 勲; 志郎 江口; 裕幸 藤田; 崇之 鈴木


Archive | 2008

ELECTRON BEAM IRRADIATION APPARATUS FOR OPEN-MOUTHED CONTAINERS

Shiro Eguchi; Tomoyuki Hikosaka; Satoru Gohzaki; Takayuki Suzuki; Shigekatsu Sato; Isao Hashimoto


Archive | 2006

Electron beam application method, electron beam application device, electron beam application device for opening-equipped vessel

Shiro Eguchi; Isao Hashimoto; Shigekatsu Sato; Hidenobu Koide; Nobuyuki Hashimoto; Takayuki Suzuki; Satoru Gozaki; Tomoyuki Hikosaka; Yukio Okamoto; Hiroyuki Fujita


Archive | 1997

Deterioration diagnosis method and device of electrical machine and apparatus

Yoshitaka Takezawa; Yuzo Ito; Shigekatsu Sato


Archive | 1997

Method and apparatus for electric device deterioration diagnosis

Yuzo Ito; Junichi Katagiri; Shigekatsu Sato; Yoshitaka Takezawa; 雄三 伊藤; 重勝 佐藤; 純一 片桐; 由高 竹澤

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