高压直流输电线下空间电荷与电场的关系研究
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摘要
为了分析高压直流输电线下空间电荷与电场两个电磁环境指标之间的联系,采用Sarma法对单极直流线路下的空间电荷密度和标称场强分布进行数值计算。利用空间电荷密度测量设备,在高压直流输电线路下方进行实际测试,分析一些线路参数对空间电荷密度与标称场强分布规律的影响。结果表明:高压直流输电线路周围的空间电荷密度和标称电场具有相似的变化规律,提高导线高度能明显减小空间电荷密度和电场强度,导线极间距和分裂数的小范围变化对空间电荷密度与地面电场影响不大,大气质量是影响空间电荷密度和电场强度大小的重要因素。
In order to analyze the connection between space charge and electric field under high voltage direct current transmission line,the Sarma method is used for numerical calculation to analyze the relationship between space charge density and electric field under unipolar direct current lines. The data is tested under the actual line through space charge density measuring device. The influence of distribution law is studied for some circuit parameters of space charge density and electric field. The results show that space charge density and electric field has a similar change rule. Increasing the height can reduce the space charge density and electric field obviously,while the line spacing and split number have little influence on them. Air quality is an important factor to affect the size of the space charge density and total electric field.
In order to analyze the connection between space charge and electric field under high voltage direct current transmission line,the Sarma method is used for numerical calculation to analyze the relationship between space charge density and electric field under unipolar direct current lines. The data is tested under the actual line through space charge density measuring device. The influence of distribution law is studied for some circuit parameters of space charge density and electric field. The results show that space charge density and electric field has a similar change rule. Increasing the height can reduce the space charge density and electric field obviously,while the line spacing and split number have little influence on them. Air quality is an important factor to affect the size of the space charge density and total electric field.
引文
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[2]刘振亚.特高压直流输电线路[M].北京:中国电力出版社,2009:1-20.
[3]舒印彪,张文亮.特高压输电若干关键技术研究[J].中国电机工程学报,2007,27(31):1-6.Shu Yinbiao,Zhang Wenliang.Research of key technologies for UHVtransmission[J].Proceedings of the CSEE,2007,27(31):1-6.
[4]吴桂芳,陆家榆,邵方殷.特高压等级输电的电磁环境研究[J].中国电力,2005,38(6):24-27.Wu Guifang,Lu Jiayu,Shao Fangyin.Research on electromagnetic environment of the next voltage level of transmission system in China[J].Electric Power,2005,38(6):24-27.
[5]麻敏华.电晕笼中单根光滑导线和涂污导线直流电晕特性的研究[D].北京:清华大学,2007.Ma Minhua.Research on corona of single slick and contaminated conductor in small corona cage[D].Beijing:Tsinghua University,2007.
[6]李立涅.特高压直流输电的技术特点与工程应用[J].电力设备,2006,7(3):1-4.Li Linie.The technical characteristics and engineering application of uhv dc transmission[J].Power Equipment,2006,7(3):1-4.
[7]张文亮,于永清,李光范,等.特高压直流技术研究[J].中国电机工程学报,2007,27(22):1-7.Zhang Wenliang,Yu Yongqing,Li Guangfan,et al.Researches on UHVDC technology[J].Proceedings of the CSEE,2007,27(22):1-7.
[8]张文亮,陆家榆,鞠勇,等.±800kV直流输电线路的导线选型研究[J].中国电机工程学报,2007,27(27):1-3.Zhang Wenliang,Lu Jiayu,Ju Yong,et al.Design consideration of conductor bundles of±800 kV DC transmission lines[J].Proceedings of the CSEE,2007,27(27):1-3.
[9]Anderson J G.EHV transmission line reference book[M].New York:Edison Electric Institute,1968.
[10]Sarma M P.Corona performance of high-voltage transmisstionlines[M].Hertfordshire,UK:Research Studies Press LTD,2000.
[11]Sarma M P,Janischewskyj W.Analysis of corona losses on DC transmission lines,Ⅰ:unipolar lines[J].IEEE Trans on Power Apparatus and Systems,1969,88(5):718-731.