带附件系统瓷支柱绝缘子的电位和电场计算
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摘要
为了研究安装附件系统对绝缘子电位和电场分布的影响,以110kV瓷支柱绝缘子为研究对象。利用有限元分析软件,分别考虑了在干燥和存在湿污层的情况下,计算并比较了有无附件系统时支柱绝缘子的电位和电场分布。最后通过干闪和污闪试验比较了有无附件系统时绝缘子的闪络电压。结果表明:在干燥情况下,安装在高压侧的附件内部电势衰减变慢,附件内部的电场降低,安装附件使得电场最大值降低了26. 6%。有湿污层存在时,第一个伞裙前端附近的场强下降最多,距离高压侧较近的其余伞裙前端附近的场强也有不同程度的下降。安装附件使泄漏电流值减少了17. 27%。安装附件之后,工频干闪电压提高了5. 9%,污闪电压提高了22. 06%。仿真结果与试验结果表现出良好的一致性。
In order to study influence of accessories system on voltage and electric field distribution of insulators,110kV porcelain post insulators were used as research objects. The FEA software was used to calculate and compare voltage and electric field distribution of post insulators with and without accessories system,when dry case and existence of wet contamination layer were considered respectively. Finally,through dry flashover and pollution flashover tests,flashover voltages of insulators with and without accessories system were compared. The results show that in the dry case,potential inside the accessory mounted on HV side decreases slow and electric field inside the accessory is reduced,installation of accessories reduces maximum electric field by 26. 6%. When wet pollution layer exists,field strength near tip of the first skirt decreases most,and field strength near tips of other skirts closer to HV side also has different degree of decline. The installation of accessories reduces leakage current by 17. 27%. After installation of accessories,power frequency dry flashover voltage increases by 5. 9%,pollution flashover voltage increases by 22. 06%. Simulation results are in good agreement with experimental results.
In order to study influence of accessories system on voltage and electric field distribution of insulators,110kV porcelain post insulators were used as research objects. The FEA software was used to calculate and compare voltage and electric field distribution of post insulators with and without accessories system,when dry case and existence of wet contamination layer were considered respectively. Finally,through dry flashover and pollution flashover tests,flashover voltages of insulators with and without accessories system were compared. The results show that in the dry case,potential inside the accessory mounted on HV side decreases slow and electric field inside the accessory is reduced,installation of accessories reduces maximum electric field by 26. 6%. When wet pollution layer exists,field strength near tip of the first skirt decreases most,and field strength near tips of other skirts closer to HV side also has different degree of decline. The installation of accessories reduces leakage current by 17. 27%. After installation of accessories,power frequency dry flashover voltage increases by 5. 9%,pollution flashover voltage increases by 22. 06%. Simulation results are in good agreement with experimental results.
引文
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[2]周荣林,邓世聪,张德赛,等.应用附件系统提高玻璃、瓷绝缘子的污秽闪络电压[J].电瓷避雷器,2014(4):26-30.ZHOU Ronglin,DENG Shicong,ZHANG Desai,et al.Improvement of pollution flashover voltage of glass and ceramic insulators with accessories system[J]. Insulators and Surge Arresters,2014(4):26-30.
[3]阳少军,张德赛,杨龙,等.应用附件系统提高复合支柱绝缘子的干闪络电压[J].电瓷避雷器,2013(2):1-4.YANG Shaojun,ZHANG Desai,YANG Long,et al. Improvement of the dry flashover voltage of composite post insulator with accessories system[J]. Insulators and Surge Arresters,2013(2):1-4.
[4]熊刚,张德赛,余长国.应用屏障装置提高复合线路绝缘子的外绝缘性能[J].电瓷避雷器,2012(5):5-8.XIONG Gang,ZHANG Desai,YU Changguo. Improvement of external insulation properties of the composite line insulator with barrier device[J]. Insulators and Surge Arresters,2012(5):5-8.
[5]金建铭.(美).电磁场有限元方法[M].西安:西安电子科技大学出版社,1998.
[6]许安,何大猛,刘守豹,等.±500kV德阳换流站支柱绝缘子放电故障电场计算分析[J].电瓷避雷器,2014(3):12-19.XU An,HE Dameng,LIU Shoubao,et al. The electric field analysis on±500 k V post insulator with discharge failure in deyang converter station[J]. Insulators and Surge Arresters,2014(3):12-19.
[7]杨宪章.工程电磁场[M].第2版.北京:中国电力出版社,2011.
[8]王艳,马晓飞.增爬裙安装位置对支柱绝缘子闪络特性的影响[J].电瓷避雷器,2016(4):17-21.WANG Yan,MA Xiaofei. Effect of booster shed location on the insulation performance of post insulator[J]. Insulators and Surge Arresters,2016(4):17-21.
[9] LUO Ling,WANG Liming,GUAN Zhicheng,et al. Influence of pin corrosion on mechanical characteristic of UHVDC disc suspension insulators and solutions[J].IEEE Transactions on Dielectrics and Electrical Insulation,2015,22(4):2242-2251.
[10]陈瑶,邹德华,牛捷,等. 500 k V输电线路中低零值绝缘子对长串绝缘子电位和电场分布的影响[J].电瓷避雷器,2015(3):29-34.CHEN Yao,ZOU Dehua,NIU Jie,et al. The impact ofzero and low resistance insulator on potential and electric field distribution of long insulator strings in the 500k V transmission line[J]. Insulators and Surge Arresters,2015(3):29-34.
[11]徐志钮,律方成,李和明,等.绝缘子电场有限元分析法的影响因素及其优化[J].高电压技术,2011,37(4):944-951.XU Zhiniu,LV Fangcheng,LI Heming,et al. Influencing factors of insulator electric field analysis by finite element method and its optimization[J]. High Voltage Engineering,2011,37(4):944-951.
[12] ILHAN S,OZDEMIR A,JAYARAM S H,et al. Ac and transient electric field distributions along a 380 k V VString insulator[C]. Conference Record of the 2012 IEEE International Symposium on Electrical Insulation(ISEI).[S. l.]:[s. n.],2012:399-403.
[13] Arshad,NEKAHI A,MCMEEKIN S G,et al. Effect of pollution severity on electric field distribution along a polymeric insulator[C]. 2015 IEEE 11th International Conference on the Properties and Applications of Dielectric Materials.[S. l.]:[s. n.],2015:612-615.
[14]法尔扎内.覆冰与污秽绝缘子[M].北京:机械工业出版社,2014.