摘要
为了准确计算特高压直流双极分裂输电线的电晕损耗,针对分裂子导线之间相互影响,子导线表面电场分布不均导致起晕电压的不同以及子导线位置不同引起的电晕损耗的差异,从电晕机理出发,根据气体自持放电条件判断起晕电压,提出了一种计算特高压直流双极分裂输电线的电晕损耗的较准确方法。利用本方法计算±800kV合成电场,验证其有效性。研究表明,子导线表面在其所分布的圆的外侧电晕损耗最严重,内侧较轻甚至不起晕;每一极的损耗主要集中在线路内侧的三个子导线上。最后分析了线路参数对电晕损耗的影响,结果表明,子导线半径和极间距是影响电晕损耗的主要因素,工程设计时应该优先考虑。
In order to accurately calculate corona loss from the bare bundled conductors of HVDC transmission lines,considering the uneven distribution of sub-surface electric field caused by interactions between the sub-conductor,different corona onset voltage and corona loss differences in different positions as sub-conductor,the authors propose a more accurate method of calculating of bipolar corona loss from the bare bundled conductors of HVDC transmission lines by analyzing mechanism under the corona,according to the condition of gas self-sustaining discharge to decide corona onset voltag.The method is applied to the synthetic electric field of ±800 kV to verify its effectiveness.The results show that the corona loss is the most serious outside of sub-surface distribution of wire round and lighter inside even without any corona loss.Each pole＇s losses are mainly concentrated in three sub-lines inside of the wire.Finally,analysis the affection of ± 800 kV line parameters on corona loss.The results show that sub-conductor radius and pole pitch have obviously impact on the corona loss and they are the main factors.They should be given priority in engineering design.
出处
《重庆大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2013年第3期90-95,共6页
Journal of Chongqing University
基金
国家自然科学基金资助项目(50907075)
作者简介
李永明（1964-），男，重庆大学副教授，博士，主要从事工程电磁场数值计算和电力系统电磁兼容方面的研究，（E-mail）cqliym@equ．edu．cn。
