±1100 kV线路金具电场仿真与电晕特性
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摘要
±1 100 kV直流工程将采用8×1 250 mm2大截面导线,与导线配套的线路金具的电晕特性是工程设计及运行必须考虑的问题,特别是悬垂线夹、间隔棒线夹以及防振锤锤头处极易发生电晕,在防晕设计时必须足够重视。应用三维有限元电场仿真计算软件,开展了±1 100 kV直流输电线路420 kN单联双节V型悬垂串、550 kN六联三挂点绝缘子耐张串及档中金具和鼠笼式刚性跳线的电场仿真计算,获得了线路各金具表面最大场强值。依托昌平特高压直流试验基地,开展了单联单挂点悬垂串、六联耐张串、鼠笼式刚性跳线、防振锤、导线间隔棒等真型金具的可见电晕试验。电场仿真和试验结果表明,悬垂串和耐张串用均压/屏蔽环管径为150mm、间隔棒线夹曲率半径为27 mm、防振锤锤头曲率半径为40 mm的设计基本能满足2 500 m以下海拔的±1 100 kV特高压直流工程防晕设计要求。研究成果已应用于国内第1条昌吉—古泉±1 100 kV直流输电线路工程设计中。
Conductors with large section of 8×1 250 mm2 will be adopted in the first ±1 100 kV UHV DC project of China.The corona characteristics of power fittings must be taken into account in engineering design and operation, especially in the corona protection design of suspension clamps, spacer clamps and hammer's heads where coronas are easy to occur.The electric fieldsof power fittings of 420 kN single-joint double-section V-shape suspension insulator, 550 kN 6-joint 3-hang-point tension insulators, cage-type rigid jumper are simulated and calculated by the three-dimensional finite-element electric field simulation software, and the maximum field strength value of power fittings surface are obtained. Based on Changping UHV DC test base, the visible corona tests of single-joint single-hang-point suspension insulators, 6-joint tension insulators, cage-type rigid jumper, dampers, spacers are carried out. The electric field simulation and corona test results show that the diameter of the grading ring is 150 mm, the radius of curvature of the spacer clamp is27 mm, and the radius of damper head is 40 mm, thus the design of power fittings can meet the requirements of ±1 100 k V UHV DC projects below 2 500 m altitude. The research results have been applied to the design of Changji-Guquan transmission project which is the first ±1 100 kV UHV DC project of China.
Conductors with large section of 8×1 250 mm2 will be adopted in the first ±1 100 kV UHV DC project of China.The corona characteristics of power fittings must be taken into account in engineering design and operation, especially in the corona protection design of suspension clamps, spacer clamps and hammer's heads where coronas are easy to occur.The electric fieldsof power fittings of 420 kN single-joint double-section V-shape suspension insulator, 550 kN 6-joint 3-hang-point tension insulators, cage-type rigid jumper are simulated and calculated by the three-dimensional finite-element electric field simulation software, and the maximum field strength value of power fittings surface are obtained. Based on Changping UHV DC test base, the visible corona tests of single-joint single-hang-point suspension insulators, 6-joint tension insulators, cage-type rigid jumper, dampers, spacers are carried out. The electric field simulation and corona test results show that the diameter of the grading ring is 150 mm, the radius of curvature of the spacer clamp is27 mm, and the radius of damper head is 40 mm, thus the design of power fittings can meet the requirements of ±1 100 k V UHV DC projects below 2 500 m altitude. The research results have been applied to the design of Changji-Guquan transmission project which is the first ±1 100 kV UHV DC project of China.
引文
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[6]李庆峰,邓桃,毛艳,等.特高压交流复合绝缘子耐张串均压特性研究[J].电网技术,2013,37(9):2541-2546.LI Qingfeng,DENG Tao,MAO Yan,et al.Study on optimization characteristic of composite tension insulators for 1000k V UHVAClines[J].Power System Technology,2013,37(9):2541-2546.
[7]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.SIMA Wenxia,SHI Jian,YUAN Tao,et al.Electrical field calculation of ultra high voltage composite insulator and optimization design of corona ring structure based on neural network and genetic algorithm[J].High Voltage Engineering,2012,38(2):257-265.
[8]李敏,刘磊,余占清,等.2 km海拔下直流线路金具起晕场强预测修正方法[J].南方电网技术,2016,10(9):55-60.LI Min,LIU Lei,YU Zhanqing,et al.Prediction method of corona inception field intensity for HVDC line fittings at 2 km altitude[J].Southern Power System Technology,2016,10(9):55-60.
[9]毛艳,鞠勇,李庆峰,等.±800 kV特高压直流不同型式跳线电气特性的比较分析[J].电网技术,2015,39(4):961-967.MAO Yan,JU Yong,LI Qingfeng,et al.Comparative analysis of electrical characteristics of different type jumpers on±800 k V DCtransmission line[J].Power System Technology,2015,39(4):961-967.
[10]邓桃,李庆峰,张学军,等.±800 kV特高压直流线路均压环优化研究[J].中国电机工程学报,2009,29(22):100-105.DENG Tao,LI Qingfeng,ZHANG Xuejun,et al.The optimization of grading ring design for±800 k V UHV DC transmission line[J].Proceedings of the CSEE,2009,29(22):100-105.
[11]±800 kV直流输电线路金具技术规范:GB/T 31235-2014[S],2014.Technical specification for fittings of±800 kV DC overhead transmission line:GB/T 31235-2014[S],2014.
[12]高电压试验技术第一部分:一般试验要求:GB/T 16927.1-1997[S],1997.High-voltage test techniques part 1:general test requirements:GB/T16927.1-1997[S],1997.
[13]电力金具试验方法第2部分:电晕和无线电干扰试验:GB/T2317.2-2008[S],2008.Test method for electric power fittings part 2:corona and RIV tests for electric power fittings:GB/T 2317.2-2008[S],2008.
[14]范建斌,谷琛,李军,等.±800 kV典型直流设备电晕起始电压的海拔校正方法[J].中国电机工程学报,2008,28(25):8-13.FAN Jianbin,GU Chen,LI Jun,et al.Altitude correction method for corona onset voltage of±800 kV typical DC equipment[J].Proceedings of the CSEE,2008,28(25):8-13.
[15]谷琛,范建斌,殷禹,等.±1 000 k V特高压直流输电系统设备电晕特性[J].高电压技术,2012,38(12):3182-3188.GU Chen,FAN Jianbin,YIN Yu,et al.Corona characteristic of power equipments used in±1 000 kV UHV DC system[J].High Voltage Engineering,2012,38(12):3182-3188.
[16]曹晶,张勤,杨迎建,等.高海拔交流输电线路金具电晕放电特性[J].高电压技术,2011,37(12):2924-2929.CAO Jing,ZHANG Qin,YANG Yingjian,et al.Corona discharge characteristic for fittings of high altitude AC transmission line[J].High Voltage Engineering,2011,37(12):2924-2929.
[2]全姗姗,谢梁,谷莉莉,等.1 000 kV交流同塔双回输电线路刚性跳线电晕特性[J].电网技术,2014,38(3):802-806.QUAN Shanshan,XIE Liang,GU Lili,et al.Experiment test on corona characteristics of rigid jumper for 1 000 kV UHVAC double circuit transmission lines on the same tower[J].Power System Technology,2014,38(3):802-806.
[3]黄道春,谢雄杰,黄正芳,等.1 000 kV交流紧凑型线路均压环参数设计和电晕特性试验布置[J].高电压技术,2013,39(12):2933-2942.HUANG Daochun,XIE Xiongjie,HUANG Zhengfang,et al.Grading ring parameter design and corona characteristic test arrangement of1 000 kV AC compact transmission line[J].High Voltage Engineering,2013,39(12):2933-2942.
[4]杨熙,左玉玺,王劲武,等.750 kV四分裂耐张塔跳线和导线表面电场分布[J].电网技术,2013,37(10):2838-2844.YANG Xi,ZUO Yuxi,WANG Jinwu,et al.Surface electric field distribution of 4-bundled conductor and jumper of tension tower for 750kV transmission line[J].Power System Technology,2013,37(10):2838-2844.
[5]杨熙,李乃一,廖晋陶,等.应用等效场强法的特高压交流双回耐张塔刚性跳线及金具电晕试验[J].电网技术,2013,37(12):3571-3576.YANG Xi,LI Naiyi,LIAO Jintao,et al.Equivalent electric field strength method used in corona test of rigid jumpers and fittings for UHVAC double circuit tension support[J].Power System Technology,2013,37(12):3571-3576.
[6]李庆峰,邓桃,毛艳,等.特高压交流复合绝缘子耐张串均压特性研究[J].电网技术,2013,37(9):2541-2546.LI Qingfeng,DENG Tao,MAO Yan,et al.Study on optimization characteristic of composite tension insulators for 1000k V UHVAClines[J].Power System Technology,2013,37(9):2541-2546.
[7]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.SIMA Wenxia,SHI Jian,YUAN Tao,et al.Electrical field calculation of ultra high voltage composite insulator and optimization design of corona ring structure based on neural network and genetic algorithm[J].High Voltage Engineering,2012,38(2):257-265.
[8]李敏,刘磊,余占清,等.2 km海拔下直流线路金具起晕场强预测修正方法[J].南方电网技术,2016,10(9):55-60.LI Min,LIU Lei,YU Zhanqing,et al.Prediction method of corona inception field intensity for HVDC line fittings at 2 km altitude[J].Southern Power System Technology,2016,10(9):55-60.
[9]毛艳,鞠勇,李庆峰,等.±800 kV特高压直流不同型式跳线电气特性的比较分析[J].电网技术,2015,39(4):961-967.MAO Yan,JU Yong,LI Qingfeng,et al.Comparative analysis of electrical characteristics of different type jumpers on±800 k V DCtransmission line[J].Power System Technology,2015,39(4):961-967.
[10]邓桃,李庆峰,张学军,等.±800 kV特高压直流线路均压环优化研究[J].中国电机工程学报,2009,29(22):100-105.DENG Tao,LI Qingfeng,ZHANG Xuejun,et al.The optimization of grading ring design for±800 k V UHV DC transmission line[J].Proceedings of the CSEE,2009,29(22):100-105.
[11]±800 kV直流输电线路金具技术规范:GB/T 31235-2014[S],2014.Technical specification for fittings of±800 kV DC overhead transmission line:GB/T 31235-2014[S],2014.
[12]高电压试验技术第一部分:一般试验要求:GB/T 16927.1-1997[S],1997.High-voltage test techniques part 1:general test requirements:GB/T16927.1-1997[S],1997.
[13]电力金具试验方法第2部分:电晕和无线电干扰试验:GB/T2317.2-2008[S],2008.Test method for electric power fittings part 2:corona and RIV tests for electric power fittings:GB/T 2317.2-2008[S],2008.
[14]范建斌,谷琛,李军,等.±800 kV典型直流设备电晕起始电压的海拔校正方法[J].中国电机工程学报,2008,28(25):8-13.FAN Jianbin,GU Chen,LI Jun,et al.Altitude correction method for corona onset voltage of±800 kV typical DC equipment[J].Proceedings of the CSEE,2008,28(25):8-13.
[15]谷琛,范建斌,殷禹,等.±1 000 k V特高压直流输电系统设备电晕特性[J].高电压技术,2012,38(12):3182-3188.GU Chen,FAN Jianbin,YIN Yu,et al.Corona characteristic of power equipments used in±1 000 kV UHV DC system[J].High Voltage Engineering,2012,38(12):3182-3188.
[16]曹晶,张勤,杨迎建,等.高海拔交流输电线路金具电晕放电特性[J].高电压技术,2011,37(12):2924-2929.CAO Jing,ZHANG Qin,YANG Yingjian,et al.Corona discharge characteristic for fittings of high altitude AC transmission line[J].High Voltage Engineering,2011,37(12):2924-2929.