高压架空导线的电流分布计算与载流量分析
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摘要
为准确计算架空导线径向截面温度分布,需要确定交流场中导线的各层电流分布规律.文中根据钢芯铝绞线的结构特点,以及复合导体磁链之间的耦合规律,推导了架空导线内部各层导体的自感系数和互感系数,并求得流过每层导体的电流相量值,同时与数值计算结果进行对比,所得平均误差仅为3.56%.将计算的导体产热率施加到有限元模型来计算截面温度分布,并通过实验验证了所述方法的准确性.在此基础上分析了径向温度分布对载流量计算的影响,发现导体最高允许运行温度的位置结构不同时,可提高的载流量会有差异,对于线路增容具有借鉴意义.
In order to calculate the radial temperature distribution of overhead transmission lines accurately,it is necessary to determine the current distribution firstly in alternating field. In this paper,the self-inductance and mutual inductance of the conductor in the overhead conductor WERE deduced,and the current phasor value of each conductor was obtained on the basis of the structural characteristics of ACSR( Aluminium Conductor Steel Reinforced) and the coupling law between composite conductor fluxes. The average error we got was 3. 56% in comparison with numeraicl results. To get the cross-section temperature,we put heat generation rate on the finite element model. The accuracy of the method was verified by strict experiments in accordance with which the influence of the radial temperature distribution on the calculation of the current carrying capacity was analyzed,which provided a reference for dynamic rating of overhead lines.
In order to calculate the radial temperature distribution of overhead transmission lines accurately,it is necessary to determine the current distribution firstly in alternating field. In this paper,the self-inductance and mutual inductance of the conductor in the overhead conductor WERE deduced,and the current phasor value of each conductor was obtained on the basis of the structural characteristics of ACSR( Aluminium Conductor Steel Reinforced) and the coupling law between composite conductor fluxes. The average error we got was 3. 56% in comparison with numeraicl results. To get the cross-section temperature,we put heat generation rate on the finite element model. The accuracy of the method was verified by strict experiments in accordance with which the influence of the radial temperature distribution on the calculation of the current carrying capacity was analyzed,which provided a reference for dynamic rating of overhead lines.
引文
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[16]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 De-ming,LIU Gang,QI Hai-xia,et al.Experimental analysis on temperautre distribution of ground wire suspension string with winding preformed armor rod[J].Guangdong Electric Power,2017,30(10):1-5.
[17]李炀,陈垣,吴志坤,等.钢芯铝绞线断股时的过热特性[J].广东电力,2017,30(6):98-102.LI Yang,CHEN Yuan,WU Zhi-kun,et al.Overheating property of ACSR’s broken strands[J].Guangdong Electric Power,2017,30(6):98-102.
[18]王春江.电线电缆手册[M].2版.北京:机械工业出版社,2014.
[2]高骏,高志强.我国统一坚强智能电网建设综述[J].河北电力技术,2009(S1):1-3.GAO Jun,GAO Zhi-qiang.Construction of unified strong smart grid in China[J].Heibei Electric Power,2009(S1):1-3.
[3]刘刚,阮班义,张鸣.架空导线动态增容的热路法暂态模型[J].电力系统自动化,2012,36(16):58-62.LIU Gang,RUAN Ban-yi,ZHANG Ming.A transient model for overhead transmission line dynamic rating based on thermal circuit method[J].Automation of Electric Power Systems,2012,36(16):58-62.
[4]刘刚,阮班义,林杰,等.架空导线动态增容的热路法稳态模型[J].高电压技术,2013,39(5):1107-1113.LIU Gang,RUAN Ban-yi,LIN Jie,et al.Steady-state model of thermal circuit method for dynamic rating of overhead lines[J].High Voltage Engineering,2013,39(5):1107-1113.
[5]王孔森,盛戈皞,王葵,等.输电线路动态增容运行风险评估[J].电力系统自动化,2011,35(23):11-16.WANG Kong-sen,SHENG Ge-hao,WANG Kui.Operation risk assessment of a transmission line dynamic line rating system[J].Automation of Electric Power Systems,2011,35(23):11-16.
[6]应展烽,徐捷,张旭东,等.基于脉动参数热路模型的架空线路动态增容风险评估[J].电力系统自动化,2015,39(23):89-95.YING Zhan-feng,XU Jie,ZHANG Xu-dong.Risk assessment of dynamic overhead lines rating based on thermal circuit model considerating pulsating characteristic of parameters[J].Automation of Electric Power Systems,2015,39(23):89-95.
[7]李莉华,高凯,迟峰.美国纽约7·17停电事故调查与分析[J].中国电力,2007,40(5):78-81.LI Li-hua,GAO Kai,CHI Feng.Investigation and analysis on New York 7.17 blackout[J].Electric Power,2007,40(5):78-81.
[8]BLACK W Z.Theoretical model for temperature gradients within bare overhead conductors[J].IEEE Transactons on Power Delivery,1988,3(2):707-716.
[9]DOUGLASS D A.Radial and axial temperaure gradients in bare stranded conductor[J].IEEE Transactons on Power Delivery,1986,1(2):7-16.
[10]应展烽,杜志佳,冯凯,等.高压架空导线径向热路模型及其参数计算方法[J].电工技术学报,2016,31(4):13-21.YING Zhan-feng,DU Zhi-jia,FENG Kai,et al.Radial thermal circuit model and parameter calculation method for high voltage overhead transmission line[J].Techniques in Electrotechnics,2016,31(4):13-21.
[11]冯慈璋,马西奎.工程电磁场导论[M].北京:高等教育出版社,2010.
[12]MORGAN V T,ZHANG B,FINDLAY R D.Effect of magnetic induction in a steel-cored conductor on current distribution,resistance and power loss[J].IEEE Transactions on Power Delivery,1997,12(3):1299-1308.
[13]赵博,张洪亮.Ansoft 12在工程电磁场中的应用[M].北京:中国水利水电出版社,2010.
[14]陶文栓.传热学[M].西安:西北工业大学出版社,2006:34-40.
[15]林杰,刘刚,张海鹏,等.架空线路并沟线夹温度分布研究[J].电力系统保护与控制,2013,41(24):88-94.LIN Jie,LIU Gang,ZHANG Hai-peng,et al.Research of temperature distribution of overhead lines parallel groove clamp[J].Power System Protection and Control,2013,41(24):88-94.
[16]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 De-ming,LIU Gang,QI Hai-xia,et al.Experimental analysis on temperautre distribution of ground wire suspension string with winding preformed armor rod[J].Guangdong Electric Power,2017,30(10):1-5.
[17]李炀,陈垣,吴志坤,等.钢芯铝绞线断股时的过热特性[J].广东电力,2017,30(6):98-102.LI Yang,CHEN Yuan,WU Zhi-kun,et al.Overheating property of ACSR’s broken strands[J].Guangdong Electric Power,2017,30(6):98-102.
[18]王春江.电线电缆手册[M].2版.北京:机械工业出版社,2014.