酸化亜鉛型避雷素子の筋状破壊機構の解明に関する研究

摘要

落雷による事故停電は事故停電の大半を占めており，電rn力会社は，雷による事故を軽減するための直列ギャップ付rn酸化亜鉛型避雷器を数多く設置してきた。%To investigate a stripe-shaped destruction mechanism of a ZnO element used for a surge arrester, some breakdown tests were carried out. Applying a large impulse current to a ZnO element, a flashover trace was confirmed at the lateral face of the element. It was found that a trace of a stripe-shaped destruction was formed by a fact that AC current flew through the trace due to the flashover caused by a large impulse current.