XZP-210绝缘子冰闪特性与串长和布置方式的关系

为了给高海拔覆冰地区超特高压直流输电线路外绝缘设计提供技术参考,在人工气候室模拟高海拔大气条件进行了大量覆冰试验研究,根据试验研究结果,分析了XZP-210直流绝缘子串冰闪闪络电压与串长和布置方式的关系.结果表明,在污秽度和气压较低的条件下,覆冰绝缘子串的直流闪络电压与串长的线性关系较微弱,但随着海拔高度或污秽程度的增加,其闪络电压与串长基本呈线性关系.绝缘子串的布置方式对冰闪电压有明显影响:水平布置的覆冰绝缘子串具有最高的闪络电压,V型串次之,垂直串最低;不同布置方式下,气压对水平布置的覆冰绝缘子串的影响最为严重.

Influence of Units and Assemble on DC Flashover Voltage of Iced Insulator Strings at High Altitude Districts

Based on artificial tests of iced DC XZP-210 insulator strings carried out in the artificial climate chamber, the authors analyze the effects of units and assemble on the DC flashover voltage of iced insulator strings at high altitude districts. The test results show that the relationship between the DC icing flashover voltage and the insulator units is seemly linear with the increase of altitude or pollution level, although the linear relation is not obvious at the low altitude or pollution level. There is influence of the assembled form on icing flashover voltages, the flashover voltage of the horizontal string of iced insulators is highest while that of the vertical string is lowest. For various assembled forms, the effects of the air pressure on the flashover voltage of the horizontal string are most obvious.