并行双回特高压直流输电线路地面合成场强计算与试验研究  

Calculation and Test of Resultant Electric Field at the Ground Level Under UHVDC Parallel Double-circuit Transmission Line

作　　者：杨小玲[1,2] 吕建红[2] 唐立军[1] 彭继文[2] 黄韬[2] 

机构地区：[1]长沙理工大学物理与电子科学学院,长沙410114 [2]国网湖南省电力公司电力科学研究院,长沙410007

出　　处：《高压电器》2015年第7期46-51,共6页High Voltage Apparatus

基　　金：国网湖南省电力公司重点科技项目(KZ12K16004)~~

摘　　要：文中采用Deutsch假设和现场实测相结合的方法,分析了特高压、并行双回特高压直流输电线路下地面合成场强的分布特性。结果表明:基于Deutsch假设计算的结果与实测结果吻合,适用于实际工程合成场强的预测。双回特高压直流线路并行时,由于空间正负离子流的相互影响作用,其场强分布与导线排列方式有较大关系,两回路线路内侧极性相同时,并行线路之间区域合成场强较单回增加,内侧极性相反时,并行线路之间区域场强较单回减小。同时,随着两回线路之间距离的减小,或线路高度的增加,与单回路相比,线路中间区域合成场强增加或减小幅度增大,但两回路线路外侧合成场强与单回线路基本相同。We analyze the ground resultant electric field distributions under UHVDC and UHVDC parallel double- circuit transmission lines by Deutsch assumption and measurement. The analysis shows that the calculation of Deutsch assumption is consistent with measurement, so this theoretical calculation method is applicable to prediction of practical resultant electric fields. For parallel UHVDC double-circuit transmission line, the resultant electric field distribution is related with conductors arrangement because of the mutual influence of positive and negative ion flows in space. When two circuits have same polarity on their medial sides, the resultant electric field intensity inside double-circuit transmission line region is higher than that around single-circuit line, on the contrary, when two circuits have opposite polarity on their medial sides, the resultant electric field intensity inside the double-circuit line region is lower than that around single-circuit line. Moreover, with the decrease in the distance between two circuits or the increase in the height of double-circuit transmission line, the resultant electric field intensity inside the double-circuit line region increases, or decreases more larger slope, but the changed amplitude of total electric field increased as the distance of double-circuit transmission lines decreasing or as the transmission lines higher. But the resultant electric field intensity outside the double-circuit line region is almost same with that of single-circuit transmission line.

关 键 词：并行双回 特高压直流输电线路 合成场强 Deutsch假设 

分 类 号：TM721.1[电气工程—电力系统及自动化]