Flashover characteristics along coil insulation under intense gamma-ray irradiation.
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概要
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The results of an experimental investigation of the surface flashover under an intense <SUP>60</SUP>Co γ-ray irradiation in air are reported. The AC voltage of 50 Hz was applied to model coils under an exposure rate of 1×10<SUP>6</SUP> R/h. It is found that flashover voltages (FOV) of the model coils are not affected at this exposure rate. The FOV of sphere gap and along polymeric cylindrical bar were also measured under irradiation, showing a slight decrease for the sphere gap at an exposure rate of 4×10<SUP>5</SUP> R/h. Further, results obtained from flashover tests for DC voltage under an extremely high exposure rate of about 10<SUP>13</SUP> R/h with pulsed X-ray beam show a significant decrease of FOV for the sphere gap and a slight decrease for the cylindrical bar. These results are closely related to whether partial discharges exist before the flashover or not. Considerations on the effect of the intense irradiation on the flashover characteristics are presented qualitatively.
- 一般社団法人 日本原子力学会の論文
著者
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Ieda Masayuki
Department Of Electrical Engineering Faculty Of Engineering Nagoya University
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ANDO Toshiro
Japan Atomic Energy Research Institute
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SATO Takanori
Hitachi Research Laboratory, Hitachi, Ltd.
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TANAKA Ryuichi
Japan Atomic Energy Research Institute
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NAGAO Masayuki
School of Electrical and Electronic Engineering, Toyohashi University of Technology
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