均压环对复合绝缘子陡波试验的影响

Influence of Corona Ring on Composite Insulators Steep Front Impulse Test

为研究均压环对复合绝缘子陡波试验的影响,利用一支110kV复合绝缘子,开展了有、无均压环情况下高压端陡波试验对比研究,对两种情况下的陡波电压幅值、陡波电压陡度进行了分析。试验结果表明,均压环的存在使陡波试验复合绝缘子发生击穿时,芯棒承受的电压幅值降低,均压环对陡波试验陡度无影响,建议复合绝缘子陡波试验在去除均压环后进行。

In order to study the influence of corona ring on the steep front impulse test of insulators,this paper used a110kV composite insulator to carry out the comparative study on high-voltage steep front impulse test with or without corona rings.This paper carried out analysis of voltage amplitude and gradient of steep front impulse for two kinds of conditions.The test results show that the existing corona ring could reduce the voltage peak value supported by mandril and the corona ring had no impacts on the steep front impulse test gradient when the composite insulator was broken down.This paper suggests that the composite insulator should be carried out tests after eliminating the steep front impulse.