基于子模型法750 kV变电站内导体三维工频电场分析及优化
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摘要
随着输电电压等级的提高,变电站内导体周围电晕问题越来越严重。为研究变电站内导体周围起晕情况,文中建立了甘肃某750 kV变电站内导体一跨的整体三维模型,结合有限元仿真软件计算其整体电场分布。然后提取各部位的子模型(如跳线、线夹),对其电场进行更为精确地计算,并提出优化电场分布方案。结果表明:导线表面的电场强度随导线分裂数的增加而下降,采用四分裂导线取代二分裂导线可以降低跳线处表面最大场强,最大电场强度由2 512.54 V/mm六变二金具,外侧线夹表面的电场强度比T型六变二金具外侧线夹表面电场强度下降了1 174.79 V/mm,降幅达到35.36%,可以有效的降低金具发生电晕现象。
To analyze the corona onset around the conductor in a 750 kV substation in Gansu Province, an entire3 D model of single-pitch conductor is built with the software package Pro/E,and the whole electric field is calculated with finite element method. Then, the typical sub-models of such as jumper and fitting in the substation arebuilt individually,and the electric field is calculated more accurately by refine-meshing. Finally,the reason of on-set corona is analyzed and some suggestions of optimization are offered. Calculation result shows that:(1)the electricfield strength reduces with increasing split number of conductor,which is similar to that of 2 D model;(2)the maxi-mum field strength around jumper is optimized by replacing two-split conductor with four-split conductor,and themaximum value reduces from 2 512.54 V/mm to 2 410.36 V/mm,satisfying the limiting value;(3)compared with the T-mode six-to-two fitting,the improved six-to-two fitting reduces the surrounding electric-field strength by 1 174.79 V/mm,that is a reduction rate of 35.36%,which can effectively weaken corona phenomenon.
To analyze the corona onset around the conductor in a 750 kV substation in Gansu Province, an entire3 D model of single-pitch conductor is built with the software package Pro/E,and the whole electric field is calculated with finite element method. Then, the typical sub-models of such as jumper and fitting in the substation arebuilt individually,and the electric field is calculated more accurately by refine-meshing. Finally,the reason of on-set corona is analyzed and some suggestions of optimization are offered. Calculation result shows that:(1)the electricfield strength reduces with increasing split number of conductor,which is similar to that of 2 D model;(2)the maxi-mum field strength around jumper is optimized by replacing two-split conductor with four-split conductor,and themaximum value reduces from 2 512.54 V/mm to 2 410.36 V/mm,satisfying the limiting value;(3)compared with the T-mode six-to-two fitting,the improved six-to-two fitting reduces the surrounding electric-field strength by 1 174.79 V/mm,that is a reduction rate of 35.36%,which can effectively weaken corona phenomenon.
引文
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[9]甘艳,阮江军,邬雄.有限元法分析高压架空线路附近电场分布[J].高电压技术,2006,32(8):52-55.GAN Yan,RUAN Jiangjun,WU Xiong.Analysis of the electric field intensity near high voltage transmission line by FEM[J].High Voltage Engineering,2006,32(8):52-55.
[10]张榴晨,徐松.有限元法在电磁计算中的应用[M].北京:中国铁道出版社,1996.ZHANG Liuchen,XU Song.Application of finite element method in electromagnetic computation[M].Beijing:China Railway Publishing House,1996.
[11]李历波,姚陈果,陈攀,等.基于模拟电荷和边界元法的变电站工频电场分布仿真研究[J].电工电能新技术,2012,31(1):39-43.LI Libo,YAO Chenguo,CHEN Pan,et al.Power frequency electric field calculation in substation by CSM and BEM[J].Advanced Technology of Electrical Engineering and Energy,2012,31(1):39-43.
[12]彭迎,阮江军.模拟电荷法计算特高压架空线路3维工频电场[J].高电压技术,2006,32(12):69-73.PENG Ying,RUAN Jiangjun.Calculation of three dimensional harmonic electric field around ultra high voltage overhead line based on the charge simulation method[J].High Voltage Engineering,2006,32(12):69-73.
[13]SINGER H,STEINBIGLER H,WEISS P.A charge simulation method for the calculation of high voltage fields[J].IEEE Transactions on Power Apparatus and System,1974,93(5):1660-1668.
[14]杜志叶,阮江军,干喆渊,等.基于3D模拟电荷法的变电站工频电场计算[J].高电压技术,2012,376(10):2587-2593.QUAN Zhiye,RUAN Jiangjun,GAN Zheyuan,et al.Calculation of power frequency electric field in substation based on 3D the charge simulation method[J].High Voltage Engineering,2012,376(10):2587-2593.
[15]曾庆禹.特高压输电线路地面最大工频电场强度和导线最大弧垂特性[J].电网技术,2008,32(6):1-7.ZENG Qingyu.Study on characteristics of maximum power frequency electric field gradient on ground and maximum sag of bundle conductor for UHVAC transmission line[J].Power System Technology,2008,32(6):1-7.
[16]卢铁兵,肖刊,张波,等.超高压输电线路铁塔附近的三维工频电场计算[J].高电压技术,2001,27(3):24-26.LU Tiebing,XIAO Kan,ZHANG Bo,et al.Calculation of electric field distribution near EHV power towers[J].High Voltage Engineering,2001,27(3):24-26.
[17]罗鹏,杨峰,周君杰,等.500 kV超高压变电站整体工频电场仿真计算与测量分析[J].电工电能新技术,2016,35(9):67-73.LUO Peng,YANG Feng,ZHOU Junjie,et al.Analysis of power frequency electromagnetic field in 500 kV substation during fault status[J].Advanced Technology of Electrical Engineering and Energy,2016,35(9):67-73.
[18]PAREKH H,SRIVASTAVA K D.Effect of avalanche space charge field on the calculation of corona onset voltage[J].IEEE Transaction on Electrical Insulation,1979,EI-14(4):181-191
[19]安然,鲁海亮,蓝磊,等.变电站三维电场计算简化模型及误差分析[J].电网技术,2014,38(11):3242-3248.AN Ran,LU Hailiang,LAN Lei,et al.Analysis on simplified model and error of three-dimensional calculation for 3d electric field in substation[J].Power System Technology,2014,38(11):3242-3248.(28)
[20]马爱清,陈吉,马文立.基于APDL的750 kV变电站内分裂导线结构优化[J].电力系统自动化学报,2016,28(8):85-90.MA Aiqing,CHEN Ji,MA Wenli.Structural optimization of split conductors in analysis on corona field of lines in750 kV substation based on APDL[J].Proceedings of the CSU-EPSA,2 016,28(8):85-90.
[21]110~750 k V架空输电线路设计技术规范:QGDW_179-2008[S].2008.(0)Code of design 110~750 kV overhead transmission line:QGDW_179-2008[S].2008.
[2]LEE B Y,PARK J K,MIN S W,et al.An effective modeling method to analyze the electric field around transmission lines and substations using a generalized finite line charge[J].IEEE Transactions on Power Delivery,1997,12(3):1143-1150.
[3]李乃一,彭宗仁.特高压变电站工频电场模拟计算及其分布规律[J].高电压技术,2012,38(9):2178-2188.LI Naiyi,PENG Zengren.Calculation and regulation of power frequency electric field in UHV substation[J].High Voltage Engineering,2012,38(9):2178-2188.
[4]梁振光,董霞.500 k V变电站工频电场的测量[J].高电压技术,2006,32(11):81-83.LIANG Zhenguang,DONG Xia.Measurement and analysis of power frequency electric field in a 500 kV substation[J].High Voltage Engineering,2006,32(11):81-83.
[5]ABDEL-SALAM M,EI-MOHANDES M TH,EI-KISHKYH.Electric field around parallel dc and multi-phase ac transmission lines[J].IEEE Trans.on Electrical Insulation,1990,25(6):1145-1152.
[6]ZHANG Bo,HE Jinliang,CUI Xiang,et al.Electric field calculation for HV insulators on the head of transmission tower by coupling CSM with BEM[J].IEEE Trans.on Magnetics,2006,42(4):543-546.
[7]黄道春,阮江军,余世峰,等.特高压紧凑型输电线路工频电场强度计算[J].高电压技术,2006,32(7):69-71.HUANG Daochun,RUAN Jiangjun,YU Shifeng,et al.Calculation of the power frequency electric field intensity of UHV compact transmission lines[J].High Voltage Engineering,2006,32(7):69-71.
[8]俞集辉,周超.复杂地势上超高压输电线路的工频电场[J].高电压技术,2006,32(1):18-20.YU Jihui,ZHOU Chao.Power-frequency electric field of EHV transmission lines under condition of complex landscape[J].High Voltage Engineering,2006,32(1):18-20.
[9]甘艳,阮江军,邬雄.有限元法分析高压架空线路附近电场分布[J].高电压技术,2006,32(8):52-55.GAN Yan,RUAN Jiangjun,WU Xiong.Analysis of the electric field intensity near high voltage transmission line by FEM[J].High Voltage Engineering,2006,32(8):52-55.
[10]张榴晨,徐松.有限元法在电磁计算中的应用[M].北京:中国铁道出版社,1996.ZHANG Liuchen,XU Song.Application of finite element method in electromagnetic computation[M].Beijing:China Railway Publishing House,1996.
[11]李历波,姚陈果,陈攀,等.基于模拟电荷和边界元法的变电站工频电场分布仿真研究[J].电工电能新技术,2012,31(1):39-43.LI Libo,YAO Chenguo,CHEN Pan,et al.Power frequency electric field calculation in substation by CSM and BEM[J].Advanced Technology of Electrical Engineering and Energy,2012,31(1):39-43.
[12]彭迎,阮江军.模拟电荷法计算特高压架空线路3维工频电场[J].高电压技术,2006,32(12):69-73.PENG Ying,RUAN Jiangjun.Calculation of three dimensional harmonic electric field around ultra high voltage overhead line based on the charge simulation method[J].High Voltage Engineering,2006,32(12):69-73.
[13]SINGER H,STEINBIGLER H,WEISS P.A charge simulation method for the calculation of high voltage fields[J].IEEE Transactions on Power Apparatus and System,1974,93(5):1660-1668.
[14]杜志叶,阮江军,干喆渊,等.基于3D模拟电荷法的变电站工频电场计算[J].高电压技术,2012,376(10):2587-2593.QUAN Zhiye,RUAN Jiangjun,GAN Zheyuan,et al.Calculation of power frequency electric field in substation based on 3D the charge simulation method[J].High Voltage Engineering,2012,376(10):2587-2593.
[15]曾庆禹.特高压输电线路地面最大工频电场强度和导线最大弧垂特性[J].电网技术,2008,32(6):1-7.ZENG Qingyu.Study on characteristics of maximum power frequency electric field gradient on ground and maximum sag of bundle conductor for UHVAC transmission line[J].Power System Technology,2008,32(6):1-7.
[16]卢铁兵,肖刊,张波,等.超高压输电线路铁塔附近的三维工频电场计算[J].高电压技术,2001,27(3):24-26.LU Tiebing,XIAO Kan,ZHANG Bo,et al.Calculation of electric field distribution near EHV power towers[J].High Voltage Engineering,2001,27(3):24-26.
[17]罗鹏,杨峰,周君杰,等.500 kV超高压变电站整体工频电场仿真计算与测量分析[J].电工电能新技术,2016,35(9):67-73.LUO Peng,YANG Feng,ZHOU Junjie,et al.Analysis of power frequency electromagnetic field in 500 kV substation during fault status[J].Advanced Technology of Electrical Engineering and Energy,2016,35(9):67-73.
[18]PAREKH H,SRIVASTAVA K D.Effect of avalanche space charge field on the calculation of corona onset voltage[J].IEEE Transaction on Electrical Insulation,1979,EI-14(4):181-191
[19]安然,鲁海亮,蓝磊,等.变电站三维电场计算简化模型及误差分析[J].电网技术,2014,38(11):3242-3248.AN Ran,LU Hailiang,LAN Lei,et al.Analysis on simplified model and error of three-dimensional calculation for 3d electric field in substation[J].Power System Technology,2014,38(11):3242-3248.(28)
[20]马爱清,陈吉,马文立.基于APDL的750 kV变电站内分裂导线结构优化[J].电力系统自动化学报,2016,28(8):85-90.MA Aiqing,CHEN Ji,MA Wenli.Structural optimization of split conductors in analysis on corona field of lines in750 kV substation based on APDL[J].Proceedings of the CSU-EPSA,2 016,28(8):85-90.
[21]110~750 k V架空输电线路设计技术规范:QGDW_179-2008[S].2008.(0)Code of design 110~750 kV overhead transmission line:QGDW_179-2008[S].2008.