雷电过电压下绝缘子串电场分布特性研究
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摘要
为了研究雷电过电压下绝缘子串的电场分布特性,使用电磁暂态仿真软件(ATP-EMTP)计算雷电绕击、反击事故绝缘子串端部的过电压情况,并通过ANSYS有限元仿真软件建立绝缘子串二维模型,将过电压计算结果作为边界条件在ANSYS中进行电场求解。计算出雷电绕击、反击事故发生时复合绝缘子串的沿面及轴向电场分布情况,并与正常工况下绝缘子串的电场分布进行对比分析。结果表明:雷电绕击、反击事故使绝缘子串端部产生过电压,大幅提高了绝缘子串沿面和端部的电场强度,同时绝缘子串的电位和电场分布发生明显畸变,造成绝缘子串发生电晕放电,电气性能降低。
In order to study the electric field distribution characteristics of insulator string under lightning overvoltage, the overvoltage of insulator string end under lightning shielding failure and back flashover accidents were calculated using alternative transients program-electromagnetic transients program(ATP-EMTP). The two dimensional model of insulator string was established by ANSYS finite element simulation software, and the electric field were solved using the overvoltage calculation results as boundary condition. The surface and axial electric field distribution of the composite insulator string under lightning shielding failure and back flashover accidents were calculated and compared with normal condition. The results show that the lightning shielding failure and back flashover accidents make the insulator string end generate overvoltage, and increase the electric field strength on the surface and at the end of insulator string greatly. At the same time, the potential and electric field distribution of insulator string are distorted obviously, which results in corona discharge occurring of insulator string, and its electrical properties reduce.
In order to study the electric field distribution characteristics of insulator string under lightning overvoltage, the overvoltage of insulator string end under lightning shielding failure and back flashover accidents were calculated using alternative transients program-electromagnetic transients program(ATP-EMTP). The two dimensional model of insulator string was established by ANSYS finite element simulation software, and the electric field were solved using the overvoltage calculation results as boundary condition. The surface and axial electric field distribution of the composite insulator string under lightning shielding failure and back flashover accidents were calculated and compared with normal condition. The results show that the lightning shielding failure and back flashover accidents make the insulator string end generate overvoltage, and increase the electric field strength on the surface and at the end of insulator string greatly. At the same time, the potential and electric field distribution of insulator string are distorted obviously, which results in corona discharge occurring of insulator string, and its electrical properties reduce.
引文
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[15] DATSIOS Z G, MIKROPOULOS P N, TSOVILIS T E. Insulator string flashover modeling with the aid of an ATPDraw object[C]//2011 46th International Universities’ Power Engineering Conference. Soest,Germany:VDE,2011.
[16]王博文,蒋正龙,陆佳政,等. 500kV防冰防雷复合绝缘子防雷特性仿真研究[J].电网技术,2017,41(7):2393-2401.
[17]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.
[18]李鹏,范建斌,李光范,等. 1000kV级特高压交流线路绝缘子串电位分布计算和均压环设计[J].中国电力,2006,39(10):33-36.
[2]王灿灿,岳平,刘宗喜,等.输电杆塔用环氧树脂复合材料的电气性能研究[J].绝缘材料,2014,47(2):36-40.
[3]郝艳捧,熊国锟,刘芹,等.基于有限元法的染污直流支柱复合绝缘子伞裙参数优化[J].中国电机工程学报,2013,33(22):183-190.
[4]陈奇.高压复合绝缘子应用及老化状态研究综述[J].绝缘材料,2016,49(4):7-13.
[5] PHILLIPS A, KUFFEL J, BAKER A, et al. Electric fields on AC composite transmission line insulators[J]. IEEE Transactions on Power Delivery,2008,23(2):823-830.
[6]周志成,何俊佳,陈俊武,等.均压环改善绝缘子串电压分布研究[J].高电压技术,2006,32(11):45-48.
[7]肖代波,张鑫.复合绝缘子三种不同染污方法的比较[J].高压电器,2011,47(2):48-52.
[8]黄欢,蒋兴良,罗利云,等.超、特高压直流线路瓷和玻璃绝缘子污闪特性研究[J].高压电器,2008,44(5):424-427.
[9]张施令,胡伟,彭宗仁,等.用有限元和粒子群算法优化特高压复合绝缘子均压环结构[J].高压电技术,2012,38(2):359-367.
[10]卢明,谈发力,何正浩,等. 220kV复合绝缘子串联玻璃、瓷绝缘子仿真研究[J].高压电器,2016,52(2):128-134.
[11]司马文霞,施健,袁涛,等.特高压复合绝缘子电场计算及基于神经网络遗传算法的均压环结构优化设计[J].高电压技术,2012,38(2):257-265.
[12]胡建林,吴尧,肖代波,等.特高压直流复合支柱绝缘子均压环的优化设计[J].高电压技术,2014,40(1):46-54.
[13]蒋兴良,黄斌,苑吉河,等.电网络法计算交流特高压绝缘子串电压分布[J].高电压技术,2008,34(1):7-10.
[14]谢辉春,文习山,邓维,等. 500kV GIS变电站雷击进线段塔顶雷电过电压的仿真研究[J].电气应用,2006,25(3):63-66.
[15] DATSIOS Z G, MIKROPOULOS P N, TSOVILIS T E. Insulator string flashover modeling with the aid of an ATPDraw object[C]//2011 46th International Universities’ Power Engineering Conference. Soest,Germany:VDE,2011.
[16]王博文,蒋正龙,陆佳政,等. 500kV防冰防雷复合绝缘子防雷特性仿真研究[J].电网技术,2017,41(7):2393-2401.
[17]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.
[18]李鹏,范建斌,李光范,等. 1000kV级特高压交流线路绝缘子串电位分布计算和均压环设计[J].中国电力,2006,39(10):33-36.