750 kV同塔双回输电线路感应电压和电流的研究
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摘要
同塔多回超/特高压输电线路因其相间距和回间距小而存在较大的感应电压、电流,直接影响线路的检修、运行和接地开关设备的选型。为此,文中以兰州东至乾县的750 kV同塔双回输电线路为例,利用ATP/EMPT电磁暂态仿真软件搭建同塔双回输电线路模型,分析了两回线路之间的水平间距、运行线路长度、地线高度、土壤电阻率以及运行电流对检修线路上产生的感应电压和感应电流的影响,给出了各种典型工况下流过检修人员的人体电流大小。结果表明:检修线路上产生的感应电压、电流与水平间距基本成反比例关系,运行线路的长度对检修线路上产生的电磁感应电压和静电感应电流的幅值影响显著,地线高度对静电感应电压与电磁感应电压、电流影响较大,土壤电阻率对检修线路上产生的感应电压和电流的影响可以忽略不计,运行电流对电磁感应电压和电磁感应电流的影响显著。当在检修位置两侧挂接接地线时,流过检修人员的电流可达到毫安级,不能完全保障工作人员的安全,应在检修点再悬挂一条安保线,流过人体的电流将降低到微安级,能够确保带电检修人员的安全。
The EHV/UHV transmission lines on the same tower have high induced voltage and current due to the small spacing and short distance,which will directly affect the line maintenance,operation and selection of grounding switch equipment. Taking the 750 kV double circuit transmission line on the same tower from Lanzhou east to Qianxian as an example,we use ATP/EMPT electromagnetic transient simulation software to build the model of double circuit transmission line on the same tower and then analyze the effects of horizontal spacing between transmission lines,length of the running line,height of the grounding wire,soil resistivity and operating current on the induced voltage and current on the maintenance line and get the current sizes through the maintenance staff under various typical working conditions. The results show that: the induction voltage and the induced current on the maintenance line are inversely proportional to the horizontal spacing;length of the running line has a significant influence on the electromagnetic induction voltage and the static induction current on the maintenance line;height of the grounding wire has great influence on static induction voltage and electromagnetic induction component;the effect of soil resistivity on the induced voltage and current on the maintenance line can be neglected;the operating current impacts the electromagnetic induction voltage and the electromagnetic induction current significantly. When the grounding wires are connected to both sides of the maintenance position,the current through the maintenance personnel can reach to the grade of m A,and the safety of the personnel can not be fully guaranteed,so a security line needs to be added in the maintenance point to lower the current flowing through the human body to the microampere level and ensure the safety of the maintenance personnel.
The EHV/UHV transmission lines on the same tower have high induced voltage and current due to the small spacing and short distance,which will directly affect the line maintenance,operation and selection of grounding switch equipment. Taking the 750 kV double circuit transmission line on the same tower from Lanzhou east to Qianxian as an example,we use ATP/EMPT electromagnetic transient simulation software to build the model of double circuit transmission line on the same tower and then analyze the effects of horizontal spacing between transmission lines,length of the running line,height of the grounding wire,soil resistivity and operating current on the induced voltage and current on the maintenance line and get the current sizes through the maintenance staff under various typical working conditions. The results show that: the induction voltage and the induced current on the maintenance line are inversely proportional to the horizontal spacing;length of the running line has a significant influence on the electromagnetic induction voltage and the static induction current on the maintenance line;height of the grounding wire has great influence on static induction voltage and electromagnetic induction component;the effect of soil resistivity on the induced voltage and current on the maintenance line can be neglected;the operating current impacts the electromagnetic induction voltage and the electromagnetic induction current significantly. When the grounding wires are connected to both sides of the maintenance position,the current through the maintenance personnel can reach to the grade of m A,and the safety of the personnel can not be fully guaranteed,so a security line needs to be added in the maintenance point to lower the current flowing through the human body to the microampere level and ensure the safety of the maintenance personnel.
引文
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[13]李兴旺,卢启付,江晶毅,等.500/220 kV同塔四回输电线路接地开关开合感应电压-感应电流能力研究[J].高压电器,2013,49(9):63-68.LI Xingwang,LU Qifu,WANG Jingyi,et al.Research on switching induced voltage and current by earthing switch in500/220 kV four-circuit on one tower[J].High Voltage Apparatus,2013,49(9):63-68.
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[16]李振强,刘传铨,戴敏.交流1 000 kV与500 kV/220 kV同塔4回线路的感应电压和电流[J].高电压技术,2013,39(12):3022-3028.LI Zhenqiang,LIU Chuanquan,DAI Min.Induced voltage and induced current on AC same-tower four-circuit lines comprised of double circuit 1 000 kV lines and double-circuit 500 kV or 220 kV lines[J].High Voltage Engineering,2013,39(12):3022-3028.
[17]曾林平,文武,阮江军,等.750 kV同塔双回线路检修线路感应电压、电流研究[J].华东电力,2012,40(7):1165-1168.ZENG Linping,WEN Wu,RUAN Jiangjun,et al.Induced voltage and current of 750 kV double circuit maintenance transmission line[J].East China Electric Power,2012,39(12):1165-1168.
[18]郭志红,姚金霞,程学启,等.500 kV同塔双回线路感应电压、电流计算及实测[J].高电压技术,2006,32(5):11-14.GUO Zhihong,YAO Jinxia,CHENG Xueqi,et al.Study and measurement of induced voltage and current for 500 kVdouble circuit line on same tower[J].High Voltage Engineering,2006,32(5):11-14.
[19]王晓彤,班连庚,项祖涛,等.换位形式对1 000 kV同塔双回线路感应电压和电流的影响[J].电力建设,2015,36(5):37-44.WANG Xiaotong,BAN Liangeng,XIANG Zutao,et al.Influence of transposing form on induced voltage and current in 1 000 kV double-circuit transmission lines[J].Electric Power Construction,2015,36(5):37-44.
[20]王晓彤,班连庚,朱普轩,等.750 kV同塔同窗同相序双回紧凑型线路的潜供电流和感应电压[J].电网技术,2011,35(1):84-90.WANG Xiaotong,BAN Liangeng,ZHU Puxuan,et al.Re-(126)search on secondary-arc currents and induced voltages for750 kV compact double-circuit transmission lines on the same tower with the same phase sequence in the same tower window[J].Power System Technology,2011,35(1):84-90.
[2]郭志冲,陆佳政,余占清,等.特高压同塔双回线路融冰装置感应电压分析[J].电网技术,2013,37(11):3016-3021.GUO Zhichong,LU Jiazheng,YU Zhanqing,et al.Analysis on induced voltage of deicer for UHV double-circuit transmission line on the same tower[J].Power System Technology,2013,37(11):3016-3021.
[3]班连庚,王晓刚,白宏坤,等.同塔架设的220 kV/500 kV输电线路感应电流与感应电压仿真分析[J].电网技术,2009,33(6):45-49.BAN Liangeng,WANG Xiaogang,BAI Hongkun,et al.Simulative analysis of induced voltages and currents among multi circuit 220 kV and 500 kV transmission lines on same tower[J].Power System Technology,2009,33(6):45-49.
[4]谢金泉,李晓华.500 kV同塔双回输电线路感应电流和感应电压研究[J].华东电力,2013,41(3):602-606.XIE Jinquan,LI Xiaohua.Induced current and voltage of500 kV double-circuit transmission lines on the same tower[J].East China Electic Power,2013,41(3):602-606.
[5]胡丹辉,蔡汉生,涂彩琪,等.500 kV同杆并架双回线路电气特性研究[J].高电压技术,2005,31(4):21-23.HU Danhui,CAI Hansheng,TU Caiqi,et al.Study on the electrical characteristic of 500 kV common tower double transmission line[J].High Voltage Engineering,2005,31(4):21-23.
[6]潘俊文,李辉,邹德华,等.500 kV紧凑型同塔双回输电线路感应电压电流的仿真计算[J].电力科学与技术学报,2015,30(3):84-90.PAN Junwen,LI Hui,ZOU Dehua,et al.Simulation and calculation for induced voltage and current of 500 kV compact double-circuit transmission line on same tower[J].Journal of Electric Power Science and Technology,2015,30(3):84-90.
[7]罗日成,李志前,李稳,等.同塔四回混压输电线路感应电压与电流分析[J].电力科学与技术学报,2015,30(1):52-59.LUO Richeng,LI Zhiqian,LI Wen,et al.Induced voltage and current analysis for four-circuit transmission line with different voltage classes on the same tower[J].Journal of Electric Power Science and Technology,2015,30(1):52-59.
[8]李宝聚,周浩.1 000 kV同塔双回线路感应电压和电流的计算分析[J].电网技术,2011,35(3):14-19.LI Baoju,ZHOU Hao.Calculation and analysis on induced voltage and current of 1 000 kV transmission line adopting structure of double circuit on the same tower[J].Power System Technology,2011,35(3):14-19.
[9]韩彦华,黄晓民,杜秦生.同杆双回线路感应电压和感应电流测量与计算[J].高电压技术,2007,33(1):140-142.HAN Yanhua,HUANG Xiaomin,DU Qinsheng.Induced voltage and current on double circuits with same tower[J].High Voltage Engineering,2007,33(1):140-142.
[10]余占清,郭志冲,陆佳政,等.特高压同塔双回线路分段融冰装置感应电压、电流的抑制措施[J].高电压技术,2014,40(5):1332-1338.YU Zhanqing,GUO Zhichong,LU Jiazheng,et al.Suppression measures for induced voltage and current of deicer of UHV double-circuit transmission line[J].High Voltage Engineering,2014,40(5):1332-1338.
[11]王晓彤,林集明,班连庚,等.1 000 kV同塔双回线路不平衡度及换位方式分析[J].电网技术,2009,33(5):1-5.WANG Xiaotong,LIN Jiming,BAN Liangeng,et al.Analysis on unbalance factor and tansposingmodes for 1 000 kVdouble-circuit transmission line on the same tower[J].Power System Technology,2009,33(5):1-5.126
[12]林莘,李学斌,徐建源.特高压同塔双回线路感应电压、电流仿真分析[J].高电压技术,2010,36(9):2193-2198.LIN Xin,LI Xuebin,XU Jianyuan.Simulation and analysis of induced voltage and current for UHV double circuit transmission lines on the same tower[J].High Voltage Engineering,2010,36(9):2193-2198.
[13]李兴旺,卢启付,江晶毅,等.500/220 kV同塔四回输电线路接地开关开合感应电压-感应电流能力研究[J].高压电器,2013,49(9):63-68.LI Xingwang,LU Qifu,WANG Jingyi,et al.Research on switching induced voltage and current by earthing switch in500/220 kV four-circuit on one tower[J].High Voltage Apparatus,2013,49(9):63-68.
[14]何雨薇,刘亚坤,颜楠楠,等.超/特高压交直流输电线路下方低压配线上的感应电压和电流计算[J].电网技术,2015,39(9):2640-2646.HE Yuwei,LIU Yakun,YAN Nannan,et al.Evaluation of induced voltage and current on low-voltage distribution lines under EHV/UHV AC and DC transmission lines[J].Power System Technology,2015,39(9):2640-2646.
[15]陈文涛,李山.750 kV双回平行线路间感应电压和感应电流的计算与实测研究[J].高压电器,2014,50(12):111-115.CHEN Wentao,LI Shan.Study on calculation and measurement of induced voltage and induced current between 750 kVdouble-circuit parallel lines[J].High Voltage Apparatus,2014,50(12):111-115.
[16]李振强,刘传铨,戴敏.交流1 000 kV与500 kV/220 kV同塔4回线路的感应电压和电流[J].高电压技术,2013,39(12):3022-3028.LI Zhenqiang,LIU Chuanquan,DAI Min.Induced voltage and induced current on AC same-tower four-circuit lines comprised of double circuit 1 000 kV lines and double-circuit 500 kV or 220 kV lines[J].High Voltage Engineering,2013,39(12):3022-3028.
[17]曾林平,文武,阮江军,等.750 kV同塔双回线路检修线路感应电压、电流研究[J].华东电力,2012,40(7):1165-1168.ZENG Linping,WEN Wu,RUAN Jiangjun,et al.Induced voltage and current of 750 kV double circuit maintenance transmission line[J].East China Electric Power,2012,39(12):1165-1168.
[18]郭志红,姚金霞,程学启,等.500 kV同塔双回线路感应电压、电流计算及实测[J].高电压技术,2006,32(5):11-14.GUO Zhihong,YAO Jinxia,CHENG Xueqi,et al.Study and measurement of induced voltage and current for 500 kVdouble circuit line on same tower[J].High Voltage Engineering,2006,32(5):11-14.
[19]王晓彤,班连庚,项祖涛,等.换位形式对1 000 kV同塔双回线路感应电压和电流的影响[J].电力建设,2015,36(5):37-44.WANG Xiaotong,BAN Liangeng,XIANG Zutao,et al.Influence of transposing form on induced voltage and current in 1 000 kV double-circuit transmission lines[J].Electric Power Construction,2015,36(5):37-44.
[20]王晓彤,班连庚,朱普轩,等.750 kV同塔同窗同相序双回紧凑型线路的潜供电流和感应电压[J].电网技术,2011,35(1):84-90.WANG Xiaotong,BAN Liangeng,ZHU Puxuan,et al.Re-(126)search on secondary-arc currents and induced voltages for750 kV compact double-circuit transmission lines on the same tower with the same phase sequence in the same tower window[J].Power System Technology,2011,35(1):84-90.