架空地线悬垂线夹电流密度分布的仿真研究
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摘要
架空地线断线事故严重影响电网的稳定运行,分析地线悬垂线夹内部的电流密度分布对研究发生在线夹内的断线机理具有重要的意义。首先建立接触部位的热路模型,分析了接触部位电流密度与其温升的关系;建立与实际接触点分布一致的地线悬垂线夹多接触点有限元仿真模型,并利用所建立的有限元仿真模型获取了线夹内部的电流密度分布;最后研究了预绞丝材料钢的相对磁导率对线夹内电流密度分布的影响。研究结果表明:在工频短路电流的作用下,发热瓶颈点位于地线悬垂线夹船体与绞线的接触界面外侧,此处电流密度值最大,温升也最高;钢的相对磁导率越大,线夹船体与绞线的接触界面外侧的电流密度越大,由此造成的温升也越高。
The ground wire breakage accident seriously affects the stable operation of power grid. It is of great significance to analyze the current density distribution within the suspension clamp of ground wire to investigate the mechanism of ground wire breakage within the clamp. Firstly, the thermal circuit model of contact region is established, and the relationship between current density of contact region and its temperature rise is also analyzed based on the thermal circuit model. Subsequently, combined with the distribution characteristics of contact points on the contact surface between the clamp and conductor, a finite element analysis(FEA) model based on multiple contact points of suspension clamp with the same actual contact points distribution is set up. According to the FEA model,current density distribution within the clamp is obtained. Finally, the effect of relative permeability of pretwisted steel on current density distribution within the clamp is studied. The results showed that hotspot is located at the outer edge of contact surface between the clamp hull and conductor. The current density and temperature rise are the highest in the hotspot. Moreover, as the relative permeability of steel increases, the current density of outer edge for contact surface between the clamp hull and conductor also increases, which results in higher temperature rise.
The ground wire breakage accident seriously affects the stable operation of power grid. It is of great significance to analyze the current density distribution within the suspension clamp of ground wire to investigate the mechanism of ground wire breakage within the clamp. Firstly, the thermal circuit model of contact region is established, and the relationship between current density of contact region and its temperature rise is also analyzed based on the thermal circuit model. Subsequently, combined with the distribution characteristics of contact points on the contact surface between the clamp and conductor, a finite element analysis(FEA) model based on multiple contact points of suspension clamp with the same actual contact points distribution is set up. According to the FEA model,current density distribution within the clamp is obtained. Finally, the effect of relative permeability of pretwisted steel on current density distribution within the clamp is studied. The results showed that hotspot is located at the outer edge of contact surface between the clamp hull and conductor. The current density and temperature rise are the highest in the hotspot. Moreover, as the relative permeability of steel increases, the current density of outer edge for contact surface between the clamp hull and conductor also increases, which results in higher temperature rise.
引文
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[19] ORIANO B, GABRIELLA C, GIOVANNI F. Numerical analysis of heating transient of electric contacts under short-circuit conditions[J]. IEEE Transactions Components Packaging, Manufacturing Technology, 1993, 16(5):563-570.
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[21]胡倩楠.计算10 kV三芯电缆导体温度的热路模型及应用研究[D].广州:华南理工大学,2013.
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[24] HAO X, YIN W, STRANGWOOD M, et al. Characterization of decarburization of steels using a multi frequency electromagnetic sensor:experiment and modeling[J]. Metallurgicaland Materials Transactions A Physical Meeallurgvand Materials Science, 2009, 40(4):745-756.
[2]易永亮,熊小伏,徐望圣,等.一种计及地线影响的输电线路可靠性动态评估方法[J].电力系统保护与控制,2017,45(10):77-84.YI Yongliang, XIONG Xiaofu, XU Wangsheng, et al. A dynamic evaluation method of transmission line reliability considering the effects of ground wire[J]. Power System Protection and Control, 2017, 45(10):77-84.
[3] LEVESQUE F, GOUDREAU S, CLOUTIER L, et al. Finite element model of the contact between a vibrating conductor and a suspension clamp[J]. Tribology International,2011,44(9):1014-1023.
[4] LALONDE S,GUILBAULT R, LANGLOIS S. Numerical analysis of ACSR conductor-clamp systems undergoing wind-induced cyclic loads[J]. IEEE Transactions on Power Delivery, 2018, 33(4):1518-1526.
[5]童光毅.关于当代能源转型方向的探讨[J].智慧电力,2018,46(10):1-3.TONG Guangyi. Probe into modern energy structuretransition[J]. Smart Power,2018,46(10):1-3.
[6]徐伟,路永玲,唐梦颖,等.江苏电网近年雷电活动及输电线路雷击跳闸分析[J].电力工程技术,2017,36(6):106-110.XU Wei, LU Yonglin, TANG Mengying,et al. Analysis of lightning activities and transmission line lightning strike tripping in Jiangsu power grid in recent years[J]. Electric Power Engineering Technology, 2017, 36(6):106-110.
[7]LAOR A, HERRELL P.J, MAYER M. A study onmeasuring contact resistance of ball bonds on thin metallization[J]. IEEE Transactions Components Packaging Manufacturing Technology, 2015, 5(5):704-708.
[8] DHOTRE M.T, KORBEL J, YE X, et al. CFD simulation of temperature rise in high-voltage circuit breakers[J].IEEE Transactions on Power Delivery, 2017, 32(6):2530-2536.
[9]曾嵘,周佩朋,王森,等.接地系统中接触电阻的仿真模型及其影响因素分析[J].高电压技术,2010,36(10):2393-2397.ZENG Rong, ZHOU Peipeng, WANG Sen, et al.Modeling of contact resistance in ground system and analysis on its influencing factors[J]. High Voltage Engineering, 2010, 36(10):2393-2397.
[10] ITO S, KAWASE Y, MORI H. 3-D finite element analysis of repulsion forces on contact systems in low voltage circuit breakers[J]. IEEE Transactions on Magnetics,1996,32(3):1677-1680.
[11] LI X, QU J, WANG Q, et al. Numerical and experimental study of the short-time withstand current capability for air circuit breaker[J]. IEEE Transactions on Power Delivery, 2013, 28(4):2610-2615.
[12] LI X, CHEN D, XIANG H, et al. 3-D finite element analysis and experimental investigation of electrodynamic repulsion force in molded case circuit breakers[J]. IEEE Transactions Components Packaging Manufacturing Technology, 2005, 28(4):877-883.
[13] KAWASE Y, MORI H, ITO S. 3-D finite element analysis of electrodynamic repulsion forces in stationary electric contacts taking into account asymmetric shape(invited)[J]. IEEE Transactions on Magnetics, 1997. 33(2):1994-1999.
[14] KONG W, CHENG Y. Measures of introduction and look forward to prevent breeze vibration of overhead power transmission lines[C]. Hohhot:2011 Second International Conference on Mechanic Automation and Control Engineering:IEEE, 2011:2299-2301.
[15]郭德明,刘刚,漆海霞,等.缠绕预绞丝的地线悬垂串温度分布实验分析[J].广东电力,2017,30(10):1-5.GUO Deming, LIU Gang, QI Haixia, et al. Experimental analysis on temperature distribution of ground wire suspension string with winding preformed armor rod[J].Guangdong Electric Power, 2017, 30(10):1-5.
[16]孟晓波,陈文灿,杨代铭,等.悬垂线夹内导线断股的超声导波检测方法仿真研究[J].智慧电力,2018,46(7):67-74.MENG Xiaobo, CHEN Wencan, YANG Daiming, et al.Simulation of ultrasonic guided waves detecting wire breakage inside suspension clamp[J]. Smart Power, 2018,46(7):67-74.
[17]刘思宁,黄欲成,田甜.架空线路导线交直流电阻比的分析与研究[J].智慧电力,2018,46(5):91-95.LIU Sining, HUANG Yucheng, TIAN Tian. Analysis on rate of AC-DC resistance in overhead conductor[J]. Smart Power, 2018, 46(5):91-95.
[18]李玉杰,李洪涛,高山,等.GW6B-252型隔离开关触头温升与接触状态关系研究[J].电力工程技术,2018,37(04):121-125.LI Yujie, LI Hongtao, GAO Shan, et al. The relationship between contact temperature and temperature rise of GW6B-252 isolation switch[J]. Electric Power Engineering Technology, 2018, 37(04):121-125.
[19] ORIANO B, GABRIELLA C, GIOVANNI F. Numerical analysis of heating transient of electric contacts under short-circuit conditions[J]. IEEE Transactions Components Packaging, Manufacturing Technology, 1993, 16(5):563-570.
[20]韩卓展,刘刚,王鹏宇,等.高压电缆暂态热路中绝缘层最佳分层数的确定方法[J].广东电力,2017,30(10):28-34.HAN Zhuozhan, LIU Gang, WANG Pengyu, et al.Determination method for optimal hierarchy numbers of insulation layer in transient thermal circuit of high-voltage cable[J]. Guangdong Electric Power, 2017, 30(10):28-34.
[21]胡倩楠.计算10 kV三芯电缆导体温度的热路模型及应用研究[D].广州:华南理工大学,2013.
[22] PAULIS F.D,OLIVIERI C, ORLANDI A,et al.Exploring remote monitoring of degraded compression and bolted joints in hv power transmission lines[J]. IEEE Transactions on Power Delivery, 2016, 31(5):2179-2187.
[23]王永明,倪孟华,路永玲,等.220kV输电线路工频短路电流分布研究[J].武汉大学学报(工学版),2011,44(3):383-387.WANG Yongming, NI Menghua, LU Yongling, et al. Research on distribution of working frequency short-circuit current of 220 kV transmission lines[J]. Engineering Journal of Wuhan University, 2011, 44(3):383-387.
[24] HAO X, YIN W, STRANGWOOD M, et al. Characterization of decarburization of steels using a multi frequency electromagnetic sensor:experiment and modeling[J]. Metallurgicaland Materials Transactions A Physical Meeallurgvand Materials Science, 2009, 40(4):745-756.