基于正交设计模型的雷电反击侵入波研究

Study of Lighting Back Strike Intruding Wave Based on Orthogonal Design Model

雷击事故是影响电网系统安全稳定运行的重要因素,尤其是雷电反击事故,较大的雷电反击侵入波是引发电力设备故障的主要原因。国内外学者就侵入波的研究很多,但缺乏对诸多影响因素的综合分析。因此,在单独分析影响因素的基础上,采用正交设计法对雷击点、杆塔冲击接地电阻R_(d)及门型构架冲击接地电阻R_(m)进行正交建模和交叉分析。研究发现,反击侵入波过电压最严重的情况为A2B0C0(雷击#3、R_(d)=10Ω及R_(m)=10Ω)和A2B0C2(雷击#3、R_(d)=10Ω及R_(m)=0.5Ω)。

Lightning strike accident is one of the most important factors affecting safe and stable operation of power system.Particularly,large lightning attack invasion wave induced by the lightning back strike is the main cause of power equipment failure.Previous works have studied a lot about lightning intruding waves but rarely conducted multi-factor comprehensive analysis.In this work,the orthogonal design model was established to analyze influences of strike point,tower grounding resistance R_(d) and portal type frame grounding resistance R_(m) on lightning intruding over-voltage.Our results showed that the lightning intruding over-voltage reaches the worst in situations of A2B0C0(lightning#3,R_(d)=10Ωand R_(m)=10Ω)and A2B0C2(lightning#3,R_(d)=10Ωand R_(m)=0.5Ω).