500kV升压站雷电侵入波过电压影响因素分析  

Study on Influence Factors of Lightning Invasion Wave Overvoltage in 500 kV Step-up Substation

作　　者：胡振兴[1] 刘渝根[2] 张勇[1] 王建南[2] 杨毅伟[1] 罗晓康[1] 

机构地区：[1]中国电力工程顾问集团公司西南电力设计院,成都610021 [2]重庆大学输配电装备及系统安全与新技术国家重点实验室.重庆400044

出　　处：《电瓷避雷器》2015年第2期50-55,共6页Insulators and Surge Arresters

基　　金：国家创新群体研究基金(编号:51021005)

摘　　要：雷电侵入波过电压是500 k V敞开式升压站雷害事故的主要原因。用ATP-EMTP软件对某500 k V升压站雷电侵入波过电压进行计算分析,研究了雷击点位置、杆塔冲击接地电阻、避雷器至主变距离、电缆进线型号以及冲击电晕对雷电侵入波过电压的影响规律,计算了500 k V电缆进线升压站避雷器的保护距离。研究表明:降低杆塔冲击接地电阻并非总是可以降低侵入波过电压,对于各基杆塔,存在一个最有效的降阻区间;冲击电晕对500 k V升压站雷电侵入波过电压影响显著,且对于不同设备及在不同运行方式下,其影响也不同。Lighting invasion wave overvoltage is the main reason for the lighting accidents of 500 kV alr-insulated step-up substation. This paper calculates the invasion wave overvohage of a 500 kV step- up substation by EMTP, analyses the influence of several major factors on the invasion wave overvoltages, such as lightning strike point, tower grounding resistance under lightning impulse striking, the distance from the surge arrester to the main transformer, type of the entrance cable and the effects of impulse corona on the invasion wave overvoltage, and so on. The results show that, reducing the tower grounding resistance is not always possible to reduce the invasion wave overvoltage. And for each tower, there is a range of resistance which is the most sensitive to the invasion wave overvoltage. The influence of impulse corona on the lightning invasion wave overvohage in 500 kV substation is significant, and its influence is different for different equipment and in different system operation modes.

关 键 词：侵入波过电压 ATP-EMTP 雷击点 杆塔冲击接地电阻 冲击电晕 

分 类 号：TM863[电气工程—高电压与绝缘技术]