超特高压交流输电线路电晕对地面电场的影响  

Influence of Corona Effect on Ground Level Electrical Field Under EHV/UHV AC Transmission Lines

作　　者：李伟[1] 张波[1] 何金良[1] 曾嵘[1] 黎小林 王琦 

机构地区：[1]清华大学电机系电力系统国家重点实验室,北京100084 [2]南方电网技术研究中心,广州510623

出　　处：《高电压技术》2008年第11期2288-2294,共7页High Voltage Engineering

基　　金：国家“十一五”科技支撑计划(2006BAA02A20)~~

摘　　要：为研究超特高压交流输电线路电晕放电对地面电场的影响,改进了基于模拟电荷法的交流线路下离子流场计算方法,并将其应用在交流线路下地面电场的计算中。所提出的改进方法考虑了导线表面电场不均匀性对电晕放电的影响,从而可对多相多分裂导线离子流场进行仿真计算。对三相8分裂1000kV交流线路的地面电场的计算结果表明,对典型1000kV三相交流输电线路参数,考虑电晕时的地面电场比不考虑电晕时增加约5%。子导线半径、分裂间距、分裂根数、相间距、线路高度等线路参数变化时电晕对地面电场有不同程度的影响。Corona decides the electromagnetic environment characteristics of transmission line. It is generally considered that the space charges produced by corona discharge are restricted in the vicinity of AC transmission lines and rarely affect the ground level electrical field. So, the corona effect is usually neglected in the calculation of ground level electrical field under AC transmission lines. However, this theory needs to he proved. In this paper, the charge simulation method （CSM） based ion flow field calculation method is improved and applied into the calculation of ground level electrical field under AC transmission lines. The influence of the conductor surface field uniformity on corona discharge is counted in, so that the ion flow field of multi-phase or bundle conductors can be simulated. The ground level electrical field considering corona effect under a 3-phase 8-bundle conductor 1000kV AC transmission line is calculated. The calculation results indicated that the corona discharge enhances the ground level electrical field, and the enhancement ratio is about 5% for typical 3-phase 1000kV AC transmission lines. The influence of line parameters such as bundled conductor radius, split conductor spacing, split conductor number, wire spacing and phase height on ground level electrical field are discussed.

关 键 词：交流输电线路 地面电场 模拟电荷法 仿真 交流离子流场 分裂导线 

分 类 号：TM726[电气工程—电力系统及自动化]