摘要
The operation data obtained abroad indicates that shielding failure in UHV transmission lines mostly accounts for the tripping-out accidents introduced by lightning striking the transmission line.Based on the discharge theories of long air gap and randomness theory,a leader progression model of lightning shielding failure is presented in this paper.The random characteristics of the downward and upward leader are simulated in this model.The ground slope angel is also considered in this model by using coordinate transformation.Moreover,the system voltage is also taken into consideration in this model.The simulation results show that the good agreement between this model and the field data.And the results suggest that return striking exist obviously in UHV transmission line.
The operation data obtained abroad indicates that shielding failure in UHV transmission lines mostly accounts for the tripping-out accidents introduced by lightning striking the transmission line.Based on the discharge theories of long air gap and randomness theory,a leader progression model of lightning shielding failure is presented in this paper.The random characteristics of the downward and upward leader are simulated in this model.The ground slope angel is also considered in this model by using coordinate transformation.Moreover,the system voltage is also taken into consideration in this model.The simulation results show that the good agreement between this model and the field data.And the results suggest that return striking exist obviously in UHV transmission line.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2008年第12期2542-2546,共5页
High Voltage Engineering
基金
Project Supported by National Natural Science Foundation of China （50707036）, Key Project of the National Eleventh-five Year Research Program of China （2006BAA02A18）.
关键词
UHV
随机理论
特高压输电线路
雷电屏蔽
模型
transmission line
lightning shielding
leader progression
randomness
UHV
tripping-out
