摘要
分析了500 kV/220 kV同塔四回输电线路的绕击耐雷性能,采用电气几何模型法EGM来计算绕击跳闸率。采用暴露弧法计算每根导线绕击跳闸率,以暴露弧为0时对应的雷电流作为雷电的最大绕击电流,并分析了地面倾角、杆塔结构等因素对500 kV/220 kV同塔四回输电线路绕击跳闸率的影响。结果表明,雷电绕击多发生在500kV线路上;随着地面倾角增大,绕击跳闸率增大;绕击跳闸率随避雷线横担长度增长而减小,但对220 kV线路影响不大。通过详细分析和计算,对塔型设计方案进行了验证、比较。
The performance against lightning strike of 500 kV/220 kV quadruple-circuits on one same tower was analyzed and shielding failure rate has been calculated according to EGM. The shielding failure rate of each wire was calculated according to exposure arc method. The lightening current when exposure arc is zero has been adopted as maximum shielding current. The influences of ground obliquity and pole structures on shielding failure rate in quadruple-circuits on one same tower have been analyzed. It has been concluded that the lightening failure are frequently occurred in 500 kV lines and shielding failure rate increases with the increase of ground obliquity. Shielding failure rate decreases with the increase of lightening conductor arm length. Lightening conductor arm length increase has no influence on 220 kV. By analysis and calculating, the tower type design scheme has been verified and compared which could give instruction on projects
出处
《吉林电力》
2010年第1期26-29,共4页
Jilin Electric Power
关键词
同塔四回线
绕击跳闸率
电气几何模型
地面倾角
击距
quadruple-circuits on one same tower
shielding failure rate
EGM
ground obliquity
striking distance
