The Effect of Acid Rain on The Tracking Resistance of Organic Insulating Materials

本文采用IEC 587出版物的方法研究了酸雨对有机绝缘材料跟踪电阻的影响。PP、PC、ABS、PS和PVC分别在人工酸雨溶液中浸泡20天和45天后进行评价。研究了试样的失效时间和接触角。用扫描电镜观察了样品表面的微观结构。跟踪过程由热视频系统监控。试验结果表明，在人工酸雨溶液中浸泡时间越长，试样的失效时间越短，接触角越小。进一步探讨了酸雨对材料跟踪阻力影响的机理。结果表明，酸雨会造成严重的侵蚀破坏，其主要原因是试样在酸雨溶液中浸泡后润湿性增加，热阻降低。

The effect of acid rain on the tracking resistance of organic insulating materials was studied by the IEC Publication 587 method in this paper. PP,PC,ABS,PS and PVC are evaluated each other after soaked in the solution of artificial acid rain for 20 and 45 days. Time to failure and the contact angle of the samples are investigated. The micro structure of sample surface is observed by SEM.And the tracking process is monitored by thermal video system. Test results show that the longer soaked period in the solution of artificial acid rain, the shorter time to failure and the smaller the contact angle of the samples. The mechanism of the effect of acid rain on the tracking resistance of materials is discussed furthermore. It's suggested that the acid rain can result in severe erosion damages which is mainly caused by the increasing of wetting and the decreasing of thermal resistance of test samples after soaked in acid rain solution.