In this paper a study on effects of AC and DC dry band arcing on silicone rubber insulators surface is presented. The insulators tested are commercially available, having as their main material silicone rubber with alumina trihydrate as an additive. In addition to literature analysis, experiments were performed following the inclined plane test method described in the ASTM D2303. It was found that the voltage type (AC or DC) and polarity (positive or negative) influence not only the damage caused by the dry band arcing, but also the average value and the behavior of the leakage current. The voltage type that caused the most damage on the insulating material was DC with positive polarity, followed by DC with negative polarity, then AC. According to other studies, the difference in the results obtained with different voltage types are mainly caused by the ion release on the electrodes, behavior of the contaminant under the electric field and the length and duration of the dry band arcs. This shows that silicone rubber insulators should not be utilized in DC systems with same voltage as the ones that are designed to withstand AC, unless modifications are made in the material properties or in the insulators design.

中文翻译：

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交流和直流电压下聚合物绝缘体侵蚀的斜面试验

本文研究了交直流干带电弧对硅橡胶绝缘子表面的影响。测试的绝缘子是市售的，以硅橡胶为主要材料，以三水合氧化铝为添加剂。除了文献分析外，还按照 ASTM D2303 中描述的斜面测试方法进行了实验。结果表明，电压类型（交流或直流）和极性（正或负）不仅影响干带电弧引起的损坏，而且影响漏电流的平均值和行为。对绝缘材料造成最大损坏的电压类型是正极性直流，其次是负极性直流，然后是交流。根据其他研究，不同电压类型所得结果的差异主要是由电极上的离子释放、污染物在电场下的行为以及干带电弧的长度和持续时间造成的。这表明硅橡胶绝缘体不应用于与设计用于承受交流电的直流系统具有相同电压的直流系统，除非对材料特性或绝缘体设计进行修改。