摘要
针对目前我国500 kV直流输电线路凸现的雨闪问题,分析认为降雨对空气间隙直流放电特性有一定影响。为了确认降雨各因素对其影响程度,在人工气候室模拟降雨和现场自然降雨条件下,对0.1~0.6 m的棒？板短空气间隙正极性直流放电特性进行了系统的试验研究。结果表明：湿闪电压比干闪电压略高,小雨对放电电压的影响不明显;降雨变大后,棒？板短空气间隙的正极性直流放电电压下降显著,且放电电压与降雨强度呈明显的负相关关系;此外,雨水电导率以及雨水温度对棒？板短空气间隙的正极性直流放电特性也有明显影响。
According to the raining flashover fault of 500 HVDC transmission lines in our country,it is analyzed that rainfall has an influence on DC discharge characteristics of air gap.Consequently,the influence of rainfall on DC discharge characteristics of rod-plane short air gap is systematically investigated under both experimental and natural conditions.The results indicate that the discharge voltage of rod-plane short air gap after raining is slightly higher than that in the dry condition,but light rain has little influence on the positive DC discharge voltage of rod-plane short air gap;however,heavier raining can obviously reduce the positive DC discharge voltage,and there is a significant negative correlation between discharge voltage and rain intensity.In addition,rainwater conductivity and temperature can affect the DC discharge characteristic of air gap.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2011年第2期261-267,共7页
High Voltage Engineering
基金
国家重点基础研究发展计划(973计划)(2009CB724501)~~
关键词
降雨
雨强
雨水电导率
空气间隙
直流
放电特性
rain
rain intensity
rainwater conductivity
air gap
DC
discharge characteristic
