电气几何模型对500kV变电站雷电侵入波风险评估的影响

为研究电气几何模型对500kV变电站雷电侵入波风险评估的影响,本文分析并比对了以往国内外提出的各类电气几何模型,针对某典型500kV变电站雷电侵入波模型,采用Matlab编程结合变电站ATP-EMTP过电压模型;分别计算了在不同电气几何模型下,雷电流幅值分布、进线段杆塔高度与杆塔接地电阻对变电站内主变平均故障间隔时间(MeanTimeBetweenFailure,MTBF)的影响。此研究结果可供对500kV变电站雷电过电压与绝缘配合进行设计、评估时参考。

Influence of Electro-Geometric Model on Risk Assessment of Lightning Surges in 500kV Substation

In order to study the influence of electro-geometric model on risk assessment of lightning surges in 500kV substation, this paper analysis and compare the electro-geometric models proposed by domestic and abroad scholars. The Matlab program and ATP-EMTP overvoltage calculation are combined and adopted in the model used for 500kV substation lightning surges analysis. Under different electro-geometric models, the influence of lightning current distribution, tower height and tower grounding resistance of substation into line segment on MTBF (Mean Time Between Failure) of 500kV substation main transformer are analyzed. The research results could provide the basis of design and assessment used in lightning overvoltage and insulation coordination of 500kV substations.