配電用直列ギャップ付避雷器の繰返し動作による特性変化

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  • Change of Performance Characteristics of Gap Type Arresters for Distribution System by Repetitive Operations
  • ハイデンヨウ チョクレツ ギャップツキ ヒライキ ノ クリカエシ ドウサ ニ

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The four types of ZnO arresters with a series gap for 6kV distribution system have been operated repeatedly till 300 times by a large impulse current of 10kA, 4/10 μs, and changes of the performance characteristics of them to operation times were examined every hundredth discharge. Moreover, after they were operated one hundred times, the electrode and spacer surfaces of their gaps were observed by a scanning electron microscope and an electron probe micro-analyzer.<br>As a result, it was found that changes of the performance characteristics of the arresters are brought by metallic contamination on the spacer surface due to repeated discharges.

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