布置方式对直流绝缘子串人工污秽闪络特性的影响

Influence of Suspension Mode on Artificial Pollution Flashover Performance of DC Insulator Strings

直流绝缘子串布置方式对污闪电压有影响，以2种典型直流瓷绝缘子（XZP-210和XZP-300）为试品，在人工雾室中通过试验研究了悬垂单串布置（Ⅰ型）、悬垂双串布置（Ⅱ型）和Ⅴ型布置绝缘子串的直流负极性污闪特性，分析了布置方式对负极性污闪电压的影响。结果表明：直流绝缘子串布置方式对污闪电压有影响；在不同污秽程度下，Ⅴ型布置时直流污闪电压比Ⅰ型布置时高14．5％～25．9％，Ⅱ型布置则比Ⅰ型布置低4．2％～9．0％；且随着污秽程度的增加，Ⅴ型布置相对于Ⅰ型布置的污闪电压提高的百分数和Ⅱ型布置相对于Ⅰ型布置降低的百分数均增大。

Suspension modes of DC insulator strings influence the pollution flashover voltage, whereas few researches are carried out to explore the influence of suspension modes on pollution flashover performance of DC insulator strings. Taking two kinds of typical DC porcelain insulators, i.e., XZP-210 and XZP-300, as test specimens and by means of test in the artificial fog chamber, the authors investigate the DC negative polarity pollution flashover performance of single link suspension insulator string （Ⅰ-shape） double link suspension insulator string （Ⅱ-shape） and insulator string arranged in Ⅴ-shape respectively. Test results show that the suspension modes influence the pollution flashover voltage; under different pollution degrees, the DC pollution flashover voltage of Ⅴ-shape insulator string is from 14.5% to 25.9% higher than that of Ⅰ-shape insulator string; the DC pollution flashover voltage of Ⅱ-shape insulator string is from 4.2% to 9.0% lower than that of Ⅰ-shape insulator string; along with the increase of pollution degree, the increase percentage of pollution flashover voltage of Ⅴ-shape arrangement and the decrease percentage of pollution flashover voltage of Ⅱ-shape arrangement in comparison with Ⅰ-shape arrangement are enlarged.