摘要
目前线路防雷工作过于偏重输电线路,弱化了对配网线路的研究,尤其是缺乏对山区复杂地形条件下配电线路的雷电防护分析。本研究采用共形网格技术CP-FDTD方案,求解不规则区域内雷电电磁场,结合2D-FDTD算法和Agrawal耦合模型,快速计算线路耦合雷电过电压,研究山体坡度对近区垂直布设的多相配电线路有无避雷线存在时中点位置处雷电感应电压的影响。研究结果表明:当山体存在一定坡度时,正、负极性水平电场空间分布范围均广于平坦情况,且三相线中点位置处耦合的过电压峰值均高于无坡度情况,无避雷线情况下增加幅度约为25%~32%,离地越高的相线感应雷电过电压峰值越高。避雷线的屏蔽作用减少了三相线感应雷电过电压。当山体存在一定坡度时,避雷线对感应雷电过电压屏蔽效果要优于平坦情况。
The lightning protection of transmission lines is too much emphasis, which weakens the research on distribution lines, especially the lack of lightning protection analysis of distribution lines under complex terrain in mountainous areas. Conformal grid technology was used to deal with electromagnetic field problem in irregular areas. Accuracy and quick calculation of lightning induced overvoltage in distribution lines was also resolved by means of 2 D-FDTD algorithm and Agrawal coupling model. The effect of mountain slope on lightning induced voltage at the midpoint of vertical multi-phase distribution lines in the vicinity of the lightning protection line was analyzed. The results show that: the spatial distribution range of the positive and negative horizontal electric field is wider than that of the flat one when the mountain has a certain slope. The peak value of the induced overvoltage of the three-phase line coupling is higher than that of the non-slope one. The amplitude of the increase is about 25%~32% respectively without the lightning arrest line. The higher the off-ground phase line is, the greater the influence is. At the same time, due to shielding effect, the lightning conductor could reduce the lightning induced overvoltage. When the hill has a certain slope, the lightning shielding effect is better than the flat case.
作者
祝婧
刘见
王金鑫
金丞
ZHU Jing;LIU Jian;WANG Jinxin;JIN Cheng(State Grid Jiangxi Power Supply Service Management Center,Nanchang 330001,China;Guodian Nari Nanjing Control System Co.,Ltd.,Nanjing 211106,China)
出处
《电瓷避雷器》
CAS
北大核心
2022年第2期53-58,共6页
Insulators and Surge Arresters
关键词
配电线路
雷电感应过电压
山体地形
时域有限差分法
共形网格
distribution line
lightning induced overvoltage
mountain terrain
finite-difference time-domain method
conformal grid
