摘要
直流输电线路离子流场的计算中,针对外加电压、导线半径、线路高度等线路结构参数对地表电磁环境影响的讨论已很成熟,但针对架空地线半径、位置等因素影响作用的理论分析却并不多见。为此,基于Deutsch假设,编制程序计算了双极导线垂直排列试验线路地表合成场强,并与试验数据进行了比对,结果表明一致性很好。基于三沪二回典型输电线路结构,计算了极导线4种不同布置方式下的地表合成场强以及离子流密度,选出电磁环境较优的"+-/+-"布置方式用于讨论架空地线对地表电磁环境的影响。结果表明,对于不同的输电线路高度,地表电磁环境随架空地线位置变化趋势一致,且受位置变化影响极小。因此,在线路杆塔设计中,考虑防雷要求对地线位置进行调整时,无需考虑地线位置变化对线路下方电磁环境的影响。
The impact of conductor configurations and structural parameters such as applied voltage,conductor radius,line height et al.on the electromagnetic environment have been widely discussed in the calculation of ion current field under HVDC transmission lines,while the influence of the radius and position of the overhead ground wire is rarely reported.Based on the Deutsch assumption,the lateral distribution of the electric field intensity at the ground level under vertical bipolar test line was calculated and was in good agreement with the measured data.The electric field intensity and ion current density were calculated for Sanhu double-circuit HVDC transmission line with four possible configuration respectively,the environment-friendly case of ＇＋-/＋-＇ arrangement was used to discuss the effect of the overhead ground wire.Calculation results show that the radius and position of the overhead ground wire has little effect on the ground level electromagnetic environment for every different transmission line heights.Therefore,in the design of the transmission tower,there is no need to consider the effect of the ground wire position on the ground level electromagnetic environment when its position required to be changed for lightning protection.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2011年第12期2965-2970,共6页
High Voltage Engineering
基金
国家重点基础研究发展计划(973计划)(2011CB209404)
特高压工程技术(昆明、广州)国家工程实验室开放基金项目~~
关键词
合成场强
离子流密度
Deutsch假设
架空地线
同塔双回直流输电线路
离子流场
total electric field
ion current density
Deutsch assumption
overhead ground wire
double-circuit HVDC transmission line on the same tower
ionized field
