计及冲击电晕的雷电侵入波对220kV变电站的影响  

Influence of lightning inrush surge on primary equipment of 220kV substation considering the effect of impulse corona

作　　者：付仙兰 陈海山[1] 翟际遥[1] 陈叙 FU Xianlan;CHEN Haishan;ZHAI Jiyao;CHEN Xu(Air Force Early Warning Academy,Wuhan 430019,China)

机构地区：[1]空军预警学院,武汉430019

出　　处：《空军预警学院学报》2021年第6期430-435,共6页Journal of Air Force Early Warning Academy

摘　　要：为了探究220 k V变电站遭受反击雷后对其主要设备的影响,首先依据冲击电晕的库-伏特性曲线,提出输电线路的冲击电晕模型;然后对220 kV变电站设备及输电线路进行研究,给出杆塔、绝缘子、避雷器等相关设施的仿真计算模型;最后利用ATP软件仿真计算侵入波不同波前时间、侵入位置及杆塔接地电阻3种因素对变电站内电容式电压互感器(CTV)、电流互感器(CT)、高压套管(HVB)及主变压器(T)过电压水平的影响.仿真结果表明同一线路反击事故中CTV、CT、HVB以及T上的暂态过电压水平依次降低;线路上的冲击电晕使雷电流幅值和能量发生衰减;变电站内CTV、CT、HVB以及T的过电压水平与波前时间成反比、与雷电波侵入点距离龙门架的距离成反比、与杆塔的冲击接地电阻成正比.In order to explore the impact of lightning flashover on 220 kV substation’s primary equipment,this paper is first based on the Q-V characteristic curve of the impulse corona to propose the impulse corona model of the transmission line, and then conducts research on 220 kV substation equipment and transmission lines, giving simulation calculation models for towers, insulators, arresters and other related facilities. Finally, the paper uses the ATP software to simulate the influence of three factors including the front time of different inrush surges, inrush point and grounding resistance of tower on overvoltage level of capacitive voltage transformer(CVT), current transformer(CT), high voltage bushing(HVB) and main transformer(T) in substations. Simulation results show that the transient overvoltage levels on CVT, CT, HVB and T decrease successively in the flashover accident of the same line, that the impulse corona on the circuit attenuates the amplitude and energy of lightning current,and that the overvoltage levels of CVT, CT, HVB and T in the substation are inversely proportional to the inrush surge front time, inversely proportional to the distance between the lightning surge inrush point and the portal frame, and directly proportional to the impact grounding resistance of the tower.

关 键 词：冲击电晕 反击事故 220KV变电站 过电压 

分 类 号：TM863[电气工程—高电压与绝缘技术]