Research on shielding failure of UHVDC based on leader progression model

Geng Yinan, Zhuang Chijie
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Abstract

Shielding failure is one of key problems of UHV transmission lines. Considering the high operating voltage and high tower of UHV transmission lines, the inception criterion of upward leader is proposed in this paper. The process of shielding failure is simulated by the method based on leader progression model and shielding failure rate is calculated. This method is verified by comparing the calculation results with the operated data of UHV transmission lines in Japan. The shielding failure characteristics of UHVDC transmission lines in China under different terrain conditions are researched.
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基于先导级数模型的特高压直流屏蔽故障研究
屏蔽失效是特高压输电线路的关键问题之一。针对特高压输电线路运行电压高、塔高的特点,提出了上导线的起始判据。采用基于先导级数模型的方法对屏蔽失效过程进行了仿真,并计算了屏蔽故障率。将计算结果与日本特高压输电线路运行数据进行对比,验证了该方法的正确性。研究了中国特高压直流输电线路在不同地形条件下的屏蔽失效特性。
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