摘要
宜华线500 kV直流输电线路具有塔身高、引雷面积大、易遭雷击的特点,需对其防雷性能进行科学的评估。文章采用改进的电气几何模型,计算了500 kV超高压直流输电线路的绕击闪络率,并利用EMTP建立并分析了反击耐雷性能研究模型,计算结果表明各种极线布置方式的绕击耐雷性能和反击耐雷性能存在差异,其中极线排列方式、地面倾角、保护角、杆塔高度和结构等因素对线路雷电性能有显著的影响。
In view of distinctive features of ±500 kV DC power transmission line from Yichang to Shanghai such as its high tower height,easy to be lightning-stricken and wider lightning-induced area,it is necessary to assess lightning protection performance of this DC transmission line.Using the improved electro-geometric model the flashover rate due to shielding failure was calculated and a model to analyze lightning resisting level of this transmission was built on EMTP platform.Calculation results showed that there were differences among the influences of various arrangements of polar line on lightning resisting levels of shielding failure and flashback,and there were evident influences of polar line arrangement,ground slope angle,protection angle,height and structure of tower on lightning performance of the transmission line.
出处
《电网技术》
EI
CSCD
北大核心
2012年第7期161-165,共5页
Power System Technology
关键词
电气几何模型
多波阻抗
绕击
反击
高压直流输电线路
electrogeometic model
multi-wave impedance
shielding failure
flashback
HVDC power transmission lines
