基于电晕效应的同塔双回架空线不同相位雷电过电压屏蔽效能研究  

Shielding Efficiency of Lightning Overvoltage in Different Phases of Overhead Lines of Double Circuit on The Same Tower Based on Corona Effect

作　　者：刘立平 严向前 李鑫 LIU Liping;YAN Xiangqian;LI Xin(Power Supply Service Center of Hunan Electric Power Co.,Ltd.,(Metrology Center),Changsha 410004,China;Intelligent Electrical Measurement and Application Technology Hunan Key Laboratory,Changsha 410004,China)

机构地区：[1]国网湖南省电力有限公司供电服务中心(计量中心),长沙410004 [2]智能电气量测与应用技术湖南省重点实验室,长沙410004

出　　处：《电瓷避雷器》2021年第4期147-152,共6页Insulators and Surge Arresters

摘　　要：电晕的形成会改变架空线路通道周围电场分布,从而会对线路耦合过电压构成较大的影响。利用ATP-EMTP仿真软件,结合动态电容电晕理论,建立了包括电晕放电、雷电流、杆塔接地阻抗、绝缘子闪络等电路模型,以500 kV同塔双回架空线路为例,主要研究了杆塔接地电阻、避雷线、电晕放电效应对架空线不同相位雷电过电压屏蔽效能评估。研究表明:杆塔接地电阻增大10倍时,雷电过电压峰值增加35%;避雷线对三个相位屏蔽雷电过电压的能力为13%-14.8%;电晕放电效应使三个相位耐雷水平抬升4%-9%。The formation of corona will change the electric field distribution around the overhead line channel,which will have a great impact on the coupling overvoltage of the line.Based on ATP-EMTP simulation software and dynamic capacitance corona theory,it is established a circuit model including corona discharge,lightning current,tower grounding impedance,insulator flashover and so on.Taking 500 kV double-circuit overhead line on the same tower as an example,the author mainly studies the effects on the tower grounding resistance,lightning protection wire and corona discharge of overhead line with different phase lightning.The results show that when the tower grounding resistance increases 10 times,the lightning overvoltage peak value increases 35%;the lightning protection line has the ability to shield the lightning overvoltage of three phases from 13%-14.8%;The corona discharge effect raised the lightning resistance of the three phases by 4-9%.

关 键 词：ATP-EMTP 电晕放电 接地电阻 闪络 过电压 

分 类 号：TM863[电气工程—高电压与绝缘技术]