湿热环境下复合绝缘子端部护套水分入侵深度研究

Research on Moisture Intrusion Depth of Composite Insulator End Sheath Under Humid and Hot Environment

湿热环境下水分侵入端部会影响复合绝缘子的性能,比如端部异常发热等,严重时还会导致其机械破坏负荷急剧下降。绝缘子端部硅橡胶材料主要为高温硫化硅橡胶材料,在运行过程中水分在硅橡胶中有一定的渗透现象,老化的硅橡胶材料由于表面粗糙度增加,水分更易在其中渗透。本文选取三组运行的压接式绝缘子试样,研究了绝缘子端部硅橡胶护套老化情况,并选取该绝缘子端部高压端第一片伞裙试样代替端部护套试样,随后进行长时间水煮和水浸泡试验研究了游离态水分侵入绝缘子的深度。得出结论:复合绝缘子端部护套老化深度有限,温度有助于水分在硅橡胶材料中的扩散,但在模拟试验中水分还不足以渗透整个压接式绝缘子护套材料,证明护套并非水分入侵压接式绝缘子端部的主要路径。

The intrusion of moisture into the end in a hot and humid environment will affect the performance of the composite insulator,such as abnormal heating of the end,and in severe cases,it will lead to a sharp drop in its mechanical damage load.The silicone rubber material at the end of the insulator is mainly high-temperature vulcanized silicone rubber material.During the operation process,moisture has a certain penetration phenomenon in the silicone rubber.Due to the increased surface roughness of the aged silicone rubber material,moisture is more likely to penetrate into it.In this paper,three groups of crimped insulator samples in operation were selected to study the aging of the silicone rubber sheath at the end of the insulator,and the first shed sample at the highvoltage end of the insulator end was selected to replace the end sheath sample.The depth of intrusion of free moisture into the insulator was investigated by long time boiling and water immersion tests.It is concluded that the aging depth of the end sheath of the composite insulator is limited,and high temperature helps the diffusion of moisture in the silicone rubber material,but in the simulation test,the moisture is not enough to penetrate the entire crimped insulator sheath material,which proves that the sheath is not the main path for moisture intrusion into the ends of crimped insulators.