緩波頭衝撃電圧による短ギャップの放電特性

概要

論文の詳細を見る
A recent great increase in electric power demands in large cities has been requiring a great amount of electric power transmission system.　In such EHV systems, the switching impulse withstand of system insulations is considered more important. Therefore, the knowledge about the performance of system insulations under the switching impulses is most important to the insulation design of the system. Recent studies of the EHV networks have shown that, by suitable means, the switching overvoltage may be limited to below 1.8 per unit, and eventually down to 1.5-1.6 per unit. Such limited switching impulses will have a very long wavefront duration time (wavefront 1500-5000μs).　The knowledge about the performance of the above mentioned switching impulse, however, is not enough.　In this report, the authors investigated the flashover characteristics and the predischarge phenomena under the above mentioned switching impulse.　As the result, it is clarified that the flashover voltage values decrease as the rise rate ot the applied voltage increase and the minimum flashover voltage value is lower than that at the power frequency voltage, and, moreover, it is found that the process of the predischarge phenomena, which cause the breakdown of the gaps, is similar to those under the other switching impulses (wavefront 1O-1OOOμs).
山形大学の論文
1974-02-20