复合绝缘横担聚氨酯/芯棒界面水扩散试验研究

Experimental Study on Water Diffusion at Interface Between Polyurethane and Mandril of Composite Insulation Crossarm

复合绝缘横担具有轻质高强的特点,可起到缩减线路走廊面积,加强电网绝缘能力等重要作用,其内绝缘界面电气绝缘性能关系着电力系统的安全稳定运行。本研究在IEC 62217:2012基础上,对内填充型复合横担的界面试样进行144 h的水扩散试验,测量不同阶段的泄漏电流和击穿情况,结合试验结果分析绝缘横担试样在水扩散试验条件下的界面老化特性。结果表明:当水扩散时间为144 h时,试样的泄漏电流高达20 mA,是未经水扩散试验试样的1 000倍,其界面击穿时间比未进行水扩散试验的试样加快了65%,水分子高温扩散作用下对界面具有破坏效应,且水扩散时间越长,对聚氨酯/芯棒界面的破坏程度越大。

The composite insulation cross arm has the characteristics of light weight and high strength,which can play an important role in reducing the area of the line corridor and strengthening the insulation capacity of the power grid.The electrical insulation performance of the internal insulation interface is related to the safe and stable operation of the power system.In this study,based on IEC 62217:2012,a 144-hour water diffusion test was carried out on the interface specimens of the inner-filled composite crossarm,and the leakage current and breakdown at different stages were measured.Combined with the test results,the insulation crossarm samples were analyzed.Interface ageing characteristics under water diffusion test conditions.The results show that when the water diffusion time is 144 h,the leakage current of the sample is as high as 20 mA,which is 1000 times that of the sample without the water diffusion test,and the interface breakdown time is faster than that of the sample without the water diffusion test.65%,water molecules have a destructive effect on the interface under the action of high temperature diffusion,and the longer the water diffusion time,the greater the damage to the polyurethane/glass fiber reinforced plastic interface.