导线表面缺陷下的电场强度仿真及测试
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摘要
输电线路在生产、安装和运行等过程中由于人为或自然环境可能会形成表面缺陷,引发局部场强畸变,可能导致电晕乃至放电,从而威胁线路的正常运行。利用COMSOL建立导线的三维模型,计算导线表面完好和存在毛刺、单线拱起和单线断股时导线周围的电场分布图和曲线,比较得出导线表面存在不同缺陷时周围的电场变化特性。在实验大厅搭建了测试平台,根据仿真设置的条件进行了试验验证,利用光学电场传感器分别测量了导线完好和存在毛刺、单线拱起和单线断股时电场的变化趋势。仿真和测试结果表明,导线表面存在不同类型的缺陷时,缺陷周围空间电场强度会有不同程度的上升,且随测量距离的增加,不同类型的缺陷衰减速度也不同,因此可以通过对比分析这个规律对表面缺陷类型进行区分。
In the process of production,installation and operation of transmission lines,surface defects may be formed due to man-made or natural environment,resulting in local field strength distortion,which may lead to corona and even discharge,thus threatening the normal operation of transmission lines. A three-dimensional model of the wire was established based on the COMSOL and the electric field distribution around the wire is calculated when the surface is intact and there are burr,single line arch and single strand break. The differences and similarities were compared to obtain the characteristics of electric field around the wire surface with different defects. The test platform was set up in the laboratory,and the test was carried out according to the conditions of the simulation. Optical electric field sensors were used to measure the variation trend of electric field when wires were intact and burred,single arched and single broken. The simulation and test results show that when there are different types of defects on the surface of the wire,the strength of the electric field around the defect will rise in varying degrees,and with the increase of the measuring distance,the attenuation speed of different types of defects is also different,so the type of surface defect can be distinguished by comparison and analysis.
In the process of production,installation and operation of transmission lines,surface defects may be formed due to man-made or natural environment,resulting in local field strength distortion,which may lead to corona and even discharge,thus threatening the normal operation of transmission lines. A three-dimensional model of the wire was established based on the COMSOL and the electric field distribution around the wire is calculated when the surface is intact and there are burr,single line arch and single strand break. The differences and similarities were compared to obtain the characteristics of electric field around the wire surface with different defects. The test platform was set up in the laboratory,and the test was carried out according to the conditions of the simulation. Optical electric field sensors were used to measure the variation trend of electric field when wires were intact and burred,single arched and single broken. The simulation and test results show that when there are different types of defects on the surface of the wire,the strength of the electric field around the defect will rise in varying degrees,and with the increase of the measuring distance,the attenuation speed of different types of defects is also different,so the type of surface defect can be distinguished by comparison and analysis.
引文
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12杨凡凡,肖诗意.变电站金属导线缺陷红外热像特征研究与应用[J].科学技术创新,2016(34):17-18Yang Fanfan,Xiao Shiyi.Rsearch and application of infrared thermography characteristics of metal wire defects in substation[J].Scientific and Technological Innovation,2016(34):17-18
13杨凌辉,肖嵘,季献武,等.基于OTDR技术的高压输电导线断股和损伤检测[J].光电子·激光,2013,24(5):961-966Yang Linghui,Xiao Rong,Ji Xianwu,et al.Detection of broken stands and damage faults of high-voltage transmission line based on OTDR technology[J].Photoelectron Laser,2013,24(5):961-966
14国家电网公司.圆线同心绞架空导线:GB/T 1179-2008[S].北京:中国标准出版社,2008State Grid Corporation.Concentric ARC overhead conductor:GB/T1179-2008[S].Beijing:China Standard Press,2008
2金安福.钢芯铝绞线绞线间接触与特性分析[J].化学工程与装备,2017(4):159-160Jin Anfu.Contact and characteristic analysis of steel reinforced aluminum stranded wire[J].Chemical Engineering and Equipment,2017(4):159-160
3郑黎阳,孙祖志.铝绞线和钢芯铝绞线的应力分析[J].武汉大学学报(工学版),1997(3):65-68Zheng Liyang,Sun Zuzhi.Stress analysis of aluminum strand and steel-cored aluminum strand[J].Journal of Wuhan University(Engineering Edition),1997(3):65-68
4李坤,程桂贤,徐振铎,等.一种计算钢芯铝绞线架空绝缘电缆紧压导体模具的方法[J].电线电缆,2011(6):43-44Li Kun,Cheng Guixian,Xu Zhenduo,et al.A method for calculating the dies of tight conductors of steel-cored aluminum stranded overhead insulated cables[J].Wire and Cable,2011(6):43-44
5 Yu Z,Li Q,Zeng R,et al.Calculation of surface electric field on UHV transmission lines under lightning stroke[J].Electric Power Systems Research,2013(94):79-85
6潘荣超,徐元超.1 000 kV特高压交流线路带毛刺导线的电场分析[J].山东电力技术,2017,44(2):43-45Pan Rongchao,Xu Yuanchao.Electric field analysis of burr wires in
1 000 kV UHV AC lines[J].Shandong Electric Power Technology,2017,44(2):43-45
7冯治国,杨嘉祥,万春,等.带毛刺高压导线电晕放电分析[J].黑龙江电力,2009,31(6):441-443Feng Zhiguo,Yang Jiaxiang,Wan Chun,et al.Corona discharge analysis of burred high voltage wire[J].Heilongjiang Electric Power,2009,31(6):441-443
8张施令.钢芯铝绞线表面电场分布及其电晕起始场强分析[J].高压电器,2018,54(4):107-112,119Zhang Shiling.Surface electric field distribution and corona initial field intensity analysis of steel core aluminum stranded wire[J].High Voltage Electrical Appliances,2018,54(4):107-112,119
9郑天茹.特高压输电线路上尖端电晕放电的研究[D].青岛:山东大学,2010Zheng Tianru.Study on the tip corona discharge on UHV transmission lines[D].Qingdao:Shandong University,2010
10林锐.直流正极性下导线电晕放电特性及影响因素的研究[D].重庆:重庆大学,2009Lin Rui.Corona discharge characteristics and influencing factors of DC positive conductor[D].Chongqing:Chongqing University,200911张志劲,张伟,黎振宇,等.不同缺陷类型导线的紫外成像检测[J].电网技术,2015,39(9):2647-2652Zhang Zhijin,Zhang Wei,Li Zhenyu,et al.Ultraviolet imaging detection of conductors with different defect types[J].Power Grid Technology,2015,39(9):2647-2652
12杨凡凡,肖诗意.变电站金属导线缺陷红外热像特征研究与应用[J].科学技术创新,2016(34):17-18Yang Fanfan,Xiao Shiyi.Rsearch and application of infrared thermography characteristics of metal wire defects in substation[J].Scientific and Technological Innovation,2016(34):17-18
13杨凌辉,肖嵘,季献武,等.基于OTDR技术的高压输电导线断股和损伤检测[J].光电子·激光,2013,24(5):961-966Yang Linghui,Xiao Rong,Ji Xianwu,et al.Detection of broken stands and damage faults of high-voltage transmission line based on OTDR technology[J].Photoelectron Laser,2013,24(5):961-966
14国家电网公司.圆线同心绞架空导线:GB/T 1179-2008[S].北京:中国标准出版社,2008State Grid Corporation.Concentric ARC overhead conductor:GB/T1179-2008[S].Beijing:China Standard Press,2008