40.5 kV大电流固封极柱绝缘结构电场分析及优化设计
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摘要
大电流固封极柱必须大量采用软连接,容易造成局放超标及沿面放电,因而对其进行绝缘结构分析及优化设计件具有重要意义。文中运用有限元分析方法得出了40.5 kV大电流固封极柱的电场分布云图,并提取分布较为集中的软连接及固定螺栓周围气体域的电场分布,指出软连接附近SF6气体中电场畸变,造成局放过大及沿面放电。依据复合绝缘电场理论,提出了在软连接周边固封极柱腔体内浇筑屏蔽网,并使屏蔽网与软连接等电位的优化方法。通过电场分析,优化后的软连接固定螺栓附近SF6气体电场强度由12 kV/mm降低为7.5 kV/mm,验证了优化设计方法理论上的可行性。局放试验结果表明,优化后的固封极柱局放量由203.98 pC降低到2.37 pC,雷电冲击试验峰值耐受电压由优化前的162 kV提升到215 kV,证明了提出的优化方案具备工程应用可行性,为大电流固封极柱结构设计及高压电器实际工程中气固复合绝缘电场的优化提供了有关参考。
Large current solid-insulation-embedded poles must use soft connection. It causes partial discharge andsurface discharge. So it is of great significance for the analysis and optimization design of insulation structure. Theelectric field distribution of 40.5 kV embedded pole is obtained by using the finite element analysis method,and theelectric field concentration area's distribution of the gas domain nearby bolts and soft connection is extracted. It is ob-vious that the electric field distortion of SF6 near soft connection,resulting in larger partial discharge and surface dis-charge. According to composite insulation electric field theory,an optimization method is proposed to cast shieldingnet around the soft connection in solid-insulation-embedded pole,and made shielding net and soft connection equi-potential. Through electric analysis,the maximum field strength of the SF6 gas near bolt decreased from 12 kV/mm to7.5 k V/mm,which confirmed the theoretical feasibility of the optimization design. Partial discharge tests show thatthe optimized embedded pole's magnitude of partial discharge decreased from 203.98 pC to 2.37 pC. Peak withstandvoltage of lightning impulse test increased from162 kV to 215 kV,It confirmed the feasibility of the optimization mea-sures in engineering applications,which provided reference for optimization design of large-current solid-insulation-embedded pole and high voltage apparatus composite insulation electric field.
Large current solid-insulation-embedded poles must use soft connection. It causes partial discharge andsurface discharge. So it is of great significance for the analysis and optimization design of insulation structure. Theelectric field distribution of 40.5 kV embedded pole is obtained by using the finite element analysis method,and theelectric field concentration area's distribution of the gas domain nearby bolts and soft connection is extracted. It is ob-vious that the electric field distortion of SF6 near soft connection,resulting in larger partial discharge and surface dis-charge. According to composite insulation electric field theory,an optimization method is proposed to cast shieldingnet around the soft connection in solid-insulation-embedded pole,and made shielding net and soft connection equi-potential. Through electric analysis,the maximum field strength of the SF6 gas near bolt decreased from 12 kV/mm to7.5 k V/mm,which confirmed the theoretical feasibility of the optimization design. Partial discharge tests show thatthe optimized embedded pole's magnitude of partial discharge decreased from 203.98 pC to 2.37 pC. Peak withstandvoltage of lightning impulse test increased from162 kV to 215 kV,It confirmed the feasibility of the optimization mea-sures in engineering applications,which provided reference for optimization design of large-current solid-insulation-embedded pole and high voltage apparatus composite insulation electric field.
引文
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[17]潘浩,殷庆铎,高文胜.固体绝缘中气隙尺寸对局部放电过程的影响[J].高电压技术,2008,34(3):458-461.PAN Hao,YIN Qingduo,GAO Wensheng. Influence of void dimensions on partial discharge in solid insulation[J]. High Voltage Engineering,2008,34(3):458-461.
[18]林莘,刘志刚. ICCG算法在SF6罐式高压断路器三维电场有限元计算中的应用[J].中国电机工程学报,2001,21(2):21-24.LIN Xin,LIU Zhigang. The application of ICCG algorithm in thethree dimensional electric field calculation of SF6 tank-type circuitbreaker[J]. Proceedings of the CSEE,2001,21(2):21-24.
[19]张文凯,吴小钊,郑亚利,等.基于静电场分析的固封极柱局部放电研究[J].高电压技术,2015,41(11):3858-3865.ZHANG Wenkai,WU Xiaozhao,ZHENG Yali,et al.Research on embedded pole partial discharge based on electrostatic field analysis[J]. High Voltage Engineering,2015,41(11):3858-3865.
[20]杨敬华,范承勇. 40.5 kV真空断路器绝缘结构电场分析及优化设计[J].电网技术,2011,35(12):146-152.YANG Jinghua,FAN Chengyong. Electric field analysis and optimization design of insulation structure of 40.5 kV vacuum circuit-breaker[J]. Power System Technology,2011,35(12):146-152.
[21]高压开关设备和控制设备标准的公用技术要求:GB11022—1999[S].1999.Common specifications for high-voltage switchgear and controlgear standards:GB 11022—1999[S].1999.
[2]勾国营,杨娇龙,骆常璐,等.基于Ansys有限元的接地回路电动力分析与优化[J].高压电器,2017,53(8):106-108.GOU Guoying,YANG Jiaolong,LUO Changlu,et al. Analysis and optimization of electrodynamic force of grounding loop based on ansysfinite element method[J]. High Voltage Apparatus,2017,53(8):106-108.
[3]杜彦明,顾霓虹.国内配电开关设备现状及事故情况[J].电网技术,2002,26(2):70-76.DU Yanming,GU Nihong. Present situation and accidents analysis of distribution switchgear in domestic power systems[J]. Power System Technology,2002,26(2):70-76.
[4]潘长明,刘刚,熊炬,等.高压开关柜绝事故的分析及防范措施[J].高压电器,2011,47(7):90-93.PAN Changming,LIU Gang,XIONG Ju,et al. High voltageswitchgear insulation accident’s analysis and countermeasures[J]. High Voltage Apparatus,2011,47(7):90-93.
[5] VOETEN S J,BECKERS F,VAN HEESCH E,et al. Optical characterization of surface dielectric barrier discharge[J]. IEEE Transactions on Plasma Science 2011,39(11):2142-2143.
[6]李清泉,许光可,房新振,等.沿面型介质阻挡放电的数值仿真计算[J].高电压技术,2012,38(7):1548-1555.LI Qingquan,XU Guangke,FANG Xinzhen,et al. Numerical simulation of surface dielectric barrier discharge[J].High Voltage Engineering,2012,38(7):1548-1555.
[7]周泽存,沈其工,方瑜,等.高电压技术[M].北京:中国电力出版,2007:62-92.ZHOU Zecun,SHEN Qigong,FANG Yu,et al. High voltage engineering[M]. Beijing:China Electric Power Press,2007:62-92.
[8]钱立骁,陈慎言. 12~24 kV氮气绝缘环网柜的研制[J].高电压技术,2014,40(12):3717-3724.QIAN Lixiao,CHEN Shenyan. Research and design of 12~24 kV nitrogen insulated ring main unit[J]. High Voltage Engineering,2014,40(12):3717-3724.
[9]潘俊,方志.多脉冲均匀介质阻挡放电特性的仿真及实验研究[J].高电压技术,2012,38(5):1132-1140.PAN Jun,FANG Zhi. Simulationg and experimental research on characteristics of multi-pulse uniform dielectric barrier discharge[J]. High Voltage Engineering,2012,38(5):1132-1140.
[10] AN J T,SHANG K F,LU N,et al. Oxidation of mercury by active species generated from a surface dielectric discharge plasma reactor[J]. Plasma Chemistry and Plasma Processing,2014,34(1):217-228.
[11]王巧红,王占杰,孙玉洲,等.基于Ansys的1 120 kV直流隔离开关的电场仿真[J].高压电器,2017,53(6):37-39.WANG Qiaohong,WANG Zhanjie,SUN Yuzhou,et al.Electric field simulation of the 1 120 kV DC disconnector based on Ansys[J]. High Voltage Apparatus,2017,53(6):37-39.
[12] IEEE Substations Committee Working Group K4. Partial discharge testing of gas insulated substations[J]. IEEE Transactions on Power Delivery,1992,7(2):499-506.
[13]包博,谢天喜. 750 kV高压电抗器笼式出线结构均压特性研究[J].电网技术,2011,35(5):232-236.BAO Bo,XIE Tianxi. Voltage sharing characteristics of cage outgoing line structure for HV reactors in 750 kV power grid[J]. Power System Technology,2011,35(5):232-236.
[14]洪国耀,赵羲英,陈冰.小型化SF6气体绝缘金属封闭开关设备的研究开发[J].高压电器,2012,48(10)78-82.HONG Guoyao,ZHAO Xiying,CHEN Bing. Research and development of the optimized&miniaturization GIS[J].High Voltage Apparatus,2012,48(10):78-82.
[15] BIGANZOLI I,BARNI R,RICCARDI C,et al. Optical and electrical characterization of a surface dielectric barrier discharge plasma actuator[J]. Plasma Sources Science and Technology,2013. 22(2):1-9.
[16]张强华,谭燕,邬建刚. 40.5 kV无SF6 C—GIS开关柜研究[J].高压电器,2011,47(6):29-38.ZHANG Qianghua,TAN Yan,WU Jiangang. Research of40.5 kV non SF6 C—Gis[J]. High Voltage Apparatus,2011,47(6):29-38.
[17]潘浩,殷庆铎,高文胜.固体绝缘中气隙尺寸对局部放电过程的影响[J].高电压技术,2008,34(3):458-461.PAN Hao,YIN Qingduo,GAO Wensheng. Influence of void dimensions on partial discharge in solid insulation[J]. High Voltage Engineering,2008,34(3):458-461.
[18]林莘,刘志刚. ICCG算法在SF6罐式高压断路器三维电场有限元计算中的应用[J].中国电机工程学报,2001,21(2):21-24.LIN Xin,LIU Zhigang. The application of ICCG algorithm in thethree dimensional electric field calculation of SF6 tank-type circuitbreaker[J]. Proceedings of the CSEE,2001,21(2):21-24.
[19]张文凯,吴小钊,郑亚利,等.基于静电场分析的固封极柱局部放电研究[J].高电压技术,2015,41(11):3858-3865.ZHANG Wenkai,WU Xiaozhao,ZHENG Yali,et al.Research on embedded pole partial discharge based on electrostatic field analysis[J]. High Voltage Engineering,2015,41(11):3858-3865.
[20]杨敬华,范承勇. 40.5 kV真空断路器绝缘结构电场分析及优化设计[J].电网技术,2011,35(12):146-152.YANG Jinghua,FAN Chengyong. Electric field analysis and optimization design of insulation structure of 40.5 kV vacuum circuit-breaker[J]. Power System Technology,2011,35(12):146-152.
[21]高压开关设备和控制设备标准的公用技术要求:GB11022—1999[S].1999.Common specifications for high-voltage switchgear and controlgear standards:GB 11022—1999[S].1999.