±800kV直流输电线路对邻近树木影响的研究

通过试验,确定±800kV直流输电线路极导线与树木之间的最小距离,对于线路设计、建设、保护环境和控制工程投资具有重要意义。为此分析了国内外输电线路对树木影响的研究现状,制定出试验方法。选择30种不同树木,在特高压直流试验线段下,进行±800 kV直流输电线路对树木短期影响的试验,获得了树木出现明显电晕时树木与极导线之间的距离。在试验线段下种植90棵树木,进行了±800 kV直流输电线路对树木长期影响的试验,获得了烧伤树木与极导线之间的距离。根据试验结果,综合考虑试验中树木烧伤、树木出现明显电晕和极导线下方空间合成电场分布特点,给出了±800 kV直流线路极导线与树木之间最小垂直距离的建议。

Influence of ±800 kV DC Power Transmission Line on Adjacent Trees

It is of important significance for design,construction of transmission line as well as for environment protection and mastery of project investment to determine the minimum distance between ±800 kV DC power transmission lines and adjacent trees by tests.Present situation of the research on influences of transmission lines on adjacent trees home and abroad was analyzed,and the testing method was drafted.30 species of trees were chosen to perform the test of short-term influence of ±800 kV DC power transmission line on the trees under the UHVDC pilot line,and the distance between the polar conductor and trees was obtained when obvious corona discharge appeared.90 trees were planted under the pilot line to perform the test of long-term influence of ±800 kV DC power transmission line on trees,and the distance between the polar conductor and burnt trees due to corona discharge was obtained.Based on test results and comprehensively considering the burnt trees due to corona discharge during the test,the appearance of obvious corona on trees and the distribution characteristic of spatial total electric field under polar conductor,the suggestion on minimum vertical distance between polar conduction of ±800 kV DC transmission line and trees was given.