Severe partial arc occurred near metal bolts on the composite tower under wet pollution conditions, which had a close relationship with the temperature distribution on the surface. Artificial contamination tests on the small-sized composite plate were carried out. Temperature distribution and leakage current variation of the specimen were acquired synchronously. The effects of float potential metal, pollution layer width, metal shape, and moisture on temperature distribution, dry band formation, and discharge phenomenon were studied by a series of comparative experiments. The results show that the float potential metal makes the temperature distribution of the pollution layer more concentrated. The dry band begins to form in the region with the highest temperature. The formation of a dry band on the narrow pollution layer is faster. The temperature of the dry band endpoint is very high and increases with the extension of the dry band. The formation and passing through of dry band blocks leakage current leading to the occurrence of partial arc. Temperature distribution near metals with sharp shapes is more inhomogeneous. In a humid environment, dry band arc can exist stably and develop to float potential metal. Owing to the rewetting of the dry band, dry band formation, and dry band arc will occur repeatedly.

中文翻译：

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电热同步观测研究浮体势金属湿污染表面的干带放电

在潮湿污染条件下，复合塔上的金属螺栓附近会出现严重的局部电弧，这与表面温度分布密切相关。在小型复合板上进行了人工污染测试。同步获取样品的温度分布和漏电流变化。通过一系列对比实验研究了浮游势金属，污染层宽度，金属形状和水分对温度分布，干带形成和放电现象的影响。结果表明，浮游势金属使污染层的温度分布更加集中。在最高温度的区域开始形成干带。在狭窄的污染层上形成干带的速度更快。干带终点的温度很高，并且随着干带的延伸而升高。干带的形成和通过会阻止泄漏电流，从而导致出现部分电弧。具有尖锐形状的金属附近的温度分布更加不均匀。在潮湿的环境中，干带电弧会稳定存在并发展成漂浮潜在的金属。由于干带的重新润湿，干带的形成和干带电弧将反复发生。