提高自然功率的大分裂间距导线排列及其电磁环境  

Conductor Arrangement of Bundle Expansion Line to Raise the Surge Impedance Power and Its Electromagnetic Environment

作　　者：李岩[1] 梁曦东[1] 

机构地区：[1]清华大学电机工程与应用电子技术系电力系统及发电设备控制和仿真国家重点实验室,北京100084

出　　处：《高电压技术》2010年第9期2285-2290,共6页High Voltage Engineering

基　　金：国家重点基础研究发展计划(973计划)(2004CB217906)~~

摘　　要：为提高500kV输电线路输送能力,对大分裂间距输电线路进行了研究。计算结果表明,增大导线分裂间距,可显著减小线路波阻抗、提高自然功率,但同时会使导线表面电场强度增加。为了抑制相导线最大场强,给出了适用于工程应用的导线排列优化方法,优化后的输电线路无线电干扰和可听噪声可降低2～3dB。基于我国500kV线路常用的猫头塔、酒杯塔的计算结果表明,在满足电磁环境限值的条件下,使用6×LGJ-240导线的优化排列大分裂间距线路比常规线路自然功率提高30%,而使用4×LGJ-500导线方案也可提高近20%。In order to improve the capacity of 500 kV transmission line,the bundle expansion（BEX） transmission line was researched.The calculation indicates the surge impedance will decrease as the distance between sub-conductors in the same phase increases,showing that the surge impedance power will be raised.But the increase of the distance between sub-conductors in the same phase will heighten the strength of the electric field on the surface of sub-conductors,which will cause the increase of radio interfere,audible noise and corona loss.The result of emulation shows that the strength of electric field on the surface of the sub-conductors which is near the other phase is higher than that away from the other phase.The optimization method was brought up to decrease the maximal electric field strength on the surface of sub-conductors in every phase.The calculation indicates our optimization method can reduce the radio interfere and audible noise by 2～3 dB.The bundle expansion transmission technique can be used not only in the construction of new transmission lines,but also in the upgrade project of old transmission lines.Calculation based on the general tower of 500 kV transmission line in China shows that,compared to the general 500 kV line,the surge impedance power of BEX line with 6×LGJ-240 sub-conductors will increase by almost 30%,and it will increase by almost 20% with the 4×LGJ-500 sub-conductors,both of them are limited by the electromagnetic environment.

关 键 词：大分裂间距 电磁环境 优化排列 自然功率 无线电干扰 可听噪声 

分 类 号：TM751[电气工程—电力系统及自动化]