交直流电晕对高温硫化硅橡胶性能的影响  

Influence of AC and DC Corona on High Temperature Vulcanized Silicone Rubber

作　　者：高岩峰[1] 王家福[1] 梁曦东[1] 阎志鹏[1] 刘瑛岩[1] 

机构地区：[1]电力系统及发电设备控制和仿真国家重点实验室(清华大学电机工程与应用电子技术系),北京市海淀区100084

出　　处：《中国电机工程学报》2016年第1期274-284,共11页Proceedings of the CSEE

基　　金：国家重点基础研究发展计划项目(973计划)(2011CB 209406)~~

摘　　要：该文使用国际大电网会议CIGRE WG D1.14推荐的多针电极系统研究了交直流电晕对高温硫化硅橡胶性能的影响。通过分析试验中的放电功率、电晕前后硅橡胶的憎水性状态、表面电阻率、拉伸强度、拉断伸长率等性能,讨论了交直流电晕、直流正负极性电晕对硅橡胶性能影响的异同。结果表明:经过电晕处理,硅橡胶的上述性能均有所下降。就硅橡胶的憎水性状态和表面电阻率而言,交流电晕对硅橡胶的影响程度大于直流电晕的影响程度,直流负极性电晕的影响程度略大于直流正极性电晕的影响程度。硅橡胶的机械强度在电晕处理后有所下降,但交直流电晕处理后的硅橡胶的机械性能差异不明显。电晕场的空间电荷效应以及硅橡胶表面的电荷积累效应是导致不同电压类型的电晕对硅橡胶性能影响不同的原因;使用傅里叶变换红外光谱(Fourier transform infrared spectroscopy,FTIR)和X射线光电子能谱(X-ray photoelectron spectroscopy,XPS)分析方法研究了硅橡胶表面化学结构在电晕前后的变化,认为硅橡胶在电晕处理前后化学结构的变化,是造成硅橡胶性能的变化的直接原因。A multi-needles corona electrode system recommended by CIGRE WG D 1.14 was employed to investigate the influence of AC and DC corona on high temperature vulcanized（HTV） silicone rubber. The discharge powers of corona were measured in test, the hydrophobicity, surface resistivity, tensile strength and elongation at break of silicone rubber before and after AC and DC corona exposure were also obtained. According to the above test results, the difference between the influences of AC corona and DC corona on the silicone rubber was distinguished in-depth. Experimental results show that the hydrophobicity and surface resistivity of silicone rubber decreases after corona exposure. Furthermore, in tems of the hydrophobicity and surface resistence, the influence of AC corona is greater than DC corona, and the influence of negative DC corona is slightly greater than positive DC corona. The mechanical performance of silicone rubber also decreases after corona exposure, however, the difference of mechanical performance of silicone rubber after AC and DC corona exposure is not obvious. The space charge effects of corona field and the surface charge cummulative effects on silicone rubber are the reason why different kinds of corona have different influences on silicone rubber properties. Moreover, the FTIR and XPS were employed to investigate the surface chemical structure change before and after corona exposure. The change of silicone rubber surface chemical structure after corona exposure is the direct reason for the silicone rubber performance decrease.

关 键 词：高温硫化硅橡胶 交直流电晕 憎水性 表面电阻率 机械强度 

分 类 号：TM855[电气工程—高电压与绝缘技术]