污秽与湿度及其交互作用对硅橡胶电晕老化后闪络电压影响研究
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摘要
以复合绝缘子用高温硫化硅橡胶为研究对象,通过正交试验,利用电晕放电加速老化电极与环境模拟系统研究了在染污硅橡胶实际运行中污秽浓度、环境湿度以及二者之间的交互作用对其沿面闪络电压的影响,探究了3种影响因素对染污硅橡胶电晕老化的影响机理及闪络电压改变的原因。结果表明:当污秽物质的憎水性较差时,高污秽浓度与高湿度条件下硅橡胶老化试样的闪络电压更高。对于憎水性相同的污秽物质,可溶性盐的存在可以增大污秽浓度与湿度间交互作用对硅橡胶老化试样闪络电压的影响,并能降低污秽浓度与湿度的变化对染污硅橡胶老化后闪络电压的影响,使得闪络电压改变的幅度减小。
High temperature vulcanized silicone rubber used for composite insulators was taken as research object, and the effects of pollution concentration and humidity and their interaction on the flashover voltage of contaminated silicon rubber was studied using corona discharge accelerate ageing electrode and environmental simulation system through orthogonal experiment. The influence mechanism of the three influencing factors on the corona ageing of contaminated silicone rubber and the change reasons of flashover voltage were investigated. The results show that when the hydrophobicity of pollutants is poor, the flashover voltage is higher under the condition of high pollution concentration and high humidity. For the pollutants with the same hydrophobicity, the presence of soluble salts can enhance the effect of interaction between pollution concentration and humidity on the flashover voltage and decrease the effect of pollution concentration and humidity on the flashover voltage of contaminated silicon rubber after ageing, making the change amplitude of flashover voltage decrease.
High temperature vulcanized silicone rubber used for composite insulators was taken as research object, and the effects of pollution concentration and humidity and their interaction on the flashover voltage of contaminated silicon rubber was studied using corona discharge accelerate ageing electrode and environmental simulation system through orthogonal experiment. The influence mechanism of the three influencing factors on the corona ageing of contaminated silicone rubber and the change reasons of flashover voltage were investigated. The results show that when the hydrophobicity of pollutants is poor, the flashover voltage is higher under the condition of high pollution concentration and high humidity. For the pollutants with the same hydrophobicity, the presence of soluble salts can enhance the effect of interaction between pollution concentration and humidity on the flashover voltage and decrease the effect of pollution concentration and humidity on the flashover voltage of contaminated silicon rubber after ageing, making the change amplitude of flashover voltage decrease.
引文
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[3]易辉.我国输电线路用绝缘子运行现状及展望[J].电器工业,2004,6(11):31-35
[4]关志成,刘瑛岩,周远翔,等.绝缘子及输变电设备外绝缘[M].北京:清华大学出版社,2006:4-6.
[5] HILLBORG H C. Loss and recovery of hydrophobicity of polymethylsiloxane after exposure to electrical discharges[D]. Stockholm:KTH Royal Insititute of Technology,2001.
[6]李敬雄.浅谈合成绝缘子[J].四川电力技术,2003(4):45-46.
[7]刘泽洪.复合绝缘子使用现状及其在特高压输电线路中的应用前景[J].电网技术,2006,30(12):1-7.
[8]晏年平,房子祎,万华,等.高温硫化硅橡胶老化状况及表征技术研究进展[J].绝缘材料,2017,50(12):1-9.
[9]孙岗,吴光亚,梁旭明,等.交流特高压变电设备积污特性研究及外绝缘配置评估[C]//第三届全国架空输电线路技术交流研讨会.上海,2012.
[10] GORUR R S, KARADY G G, JAGOTA A, et al. Aging in silicone rubber used for outdoor insulation[J]. IEEE Transactions on Power Delivery,1992,7(2):525-538.
[11]苑吉河.输电线路绝缘子(串)交流污闪特性及放电过程的研究[D].重庆:重庆大学,2008.
[12]孙保强,王黎明,关志成,等.电压种类及极性对绝缘子积污的影响[J].高电压技术,2013,39(12):3101-3108.
[13]律方成,黄华,刘云鹏,等.风洞模拟自然横风条件下绝缘子带电积污特性[J].高电压技术,2014,40(5):1281-1289.
[14] KIM S H, CHERNEY E A, HACKAM R. The loss and recovery of hydrophobicity of RTV silicone rubber insulator coatings[J]. IEEE Transactions on Power Delivery,1990,5(3):1491-1500.
[15]梁培松.复合绝缘子用硅橡胶材料的陷阱对其闪络特性的影响[D].北京:华北电力大学,2015.
[16] LIANG X, WANG S, JU F, et al. Development of composite insulators in China[J]. IEEE Transactions on Dielectrics and Electrical Insulation,1999,6(5):586-594.
[17]梁曦东,沈庆河,王绍武,等.运行合成绝缘子检测技术和耐雷电冲击特性的试验研究技术报告[R].济南:山东电力集团公司,2001.
[18]刘洋,周志成,魏旭,等.不同环境因素对硅橡胶憎水性及憎水迁移性的影响[J].高电压技术,2010,36(10):2454-2459.
[19]高允彦.正交及回归试验设计方法[M].北京:冶金工业出版社,1988.