Effect of Lightning Protective Devices Attached to Pole Transformers on Reduction of Overvoltage on Distribution Lines
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概要
- 論文の詳細を見る
Abstract: Class-10A solid-core insulators (BIL 90kV) have been used instead of class-6A pin insulators (BIL 60kV) in order to improve the insulation level of distribution lines. However, lightning protective devices attached to pole transformers may have the effect of reducing the overvoltages on phase conductors. We have investigated the lightning protection effect of devices attached to pole transformers by experiment and analysis using the EMTP (Electro-Magnetic Transients Program). The sparkover rate changes from 2.0˜3.3% to 5.5˜9.9% and increases 2.4˜2.8 times when the line insulator of the phase conductors is changed from class-10A to class-6A. It is thought that the insulation level of the line insulator can be reduced depending upon the local particularities, such as number of installed transformers, frequency of direct lightning stroke to the distribution line, and so on although the overall fault rate may increase to some extent.
- 社団法人 電気学会の論文
- 2004-01-01
著者
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Yokoyama Shigeru
Central Res. Inst. Of Electric Power Ind.
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Yokoyama S
Kyushu University
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ASAOKA Yoshinobu
Central Research Institute of Electric Power Industry
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ASAKAWA Akira
Central Research Institute of Electric Power Industry
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YOKOYAMA Shigeru
Kyushu University
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NAKADA Kazuo
Hokuriku Electric Power Company
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SUGIMOTO Hitoshi
Hokuriku Electric Power Company
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Nakada Kazuo
Hokuriku Electric Power Co.
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Asakawa Akira
Electric Power Engineering Research Lab. Central Research Institute Of Electric Power Industry
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Yokoyama S
Criepi
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Yokoyama Shigeru
Electric Power Engineering Research Lab. Central Research Institute Of Electric Power Industry
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Asakawa Akira
Central Res. Inst. Electric Power Ind.
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Sugimoto Hitoshi
Hokuriku Electric Power Co.
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