交、直流共用超/特高压输电走廊下地面工频电场及最优相序排列方式分析  

Analysis on Power Frequency Electric Field at Ground Surface and Optimal Phase Sequence Arrangement of EHV/UHV Transmission Lines in Common AC/DC Transmission Corridor

作　　者：朱军[1] 吴广宁[1] 石超群[1] 曹晓斌[1] 

机构地区：[1]西南交通大学电气工程学院,成都610031

出　　处：《高电压技术》2014年第9期2797-2805,共9页High Voltage Engineering

基　　金：铁道部重大专项课题(2011T008-D);国家电网公司科技项目(2011-WG-4)~~

摘　　要：为减小共用走廊高压输电线路的地面工频电场使其达到最低水平,研究了走廊内输电线路相序排列方式与地面工频电场的关系,得到了使输电线路走廊中部区域地面工频电场最小的最优相序排列方式。通过对地面工频电场空间矢量分布和相导线电压相位关系的分析,给出了此最优相序排列规律的物理解释。采用典型参数建立了各回导线不同布置条件下共用走廊输电线路地面工频电场计算模型,计算了不同相序排列方式下走廊中部区域地面工频电场最大值;找出了中部区域最大值极小时的线路相序排列方式,验证了该最优相序排列方式的正确性与适用性。最后,结合已有相关研究成果,提出的共用走廊高压输电线路最优相序排列方式,为各同杆双回线路均逆相序排列,且在走廊中部区域非同杆各回线路靠近走廊内侧(或距地面最近)的相线间相位应相差120°、中间导线间相位应相同,为实际工程提供指导。In order to minimize the power frequency （PF） electric field underneath multiple high-voltage transmission lines sharing a common corridor, we investigated the influence of the lines＇ phase sequence arrangement on the electric field and hence obtained an optimum arrangement. After analyzing the PF electric field＇s spatial vector distribution and the relationship of voltage phases in the conductors, we proposed a physical explanation of the optimum arrangement. Then using some typical parameters of AC transmission lines, we established a calculation model of the PF electric field to calculate the field＇s highest intensity under different phase sequence arrangements. According to the results, we ob- tained the phase sequence arrangement corresponding to a minimum peak of the electric filed in the corridor＇s axis, and verified the correctness and applicability of this optimum arrangement. Moreover, taking some existing relevant research results into consideration, we presented the optimum phase sequence arrangement： each of the double circuit lines on the same tower was arranged conversely, and in the middle section of transmission corridor, different circuits on different towers should have difference of 120° between their phases of the lines in the inner side of the common corridor （or being the closest to the ground） but the same phase of the lines located in the middle position of the corridor. The conclusions could be used to guide practical constructions.

关 键 词：共用走廊 500 kV交流线路 相量 地面工频电场 相序排列方式 优化布局 

分 类 号：TM75[电气工程—电力系统及自动化]