摘要
准确地确定杆塔接地体的冲击接地电阻是提高输电线路耐雷水平的前提,目前的研究大多忽略了土壤火花放电的非线性影响。分析了考虑火花放电效应时的接地体等效模型的思路和构想,在此基础上提出了2种基于ATP-EMTP的仿真计算模型,这2种仿真模型都能很好地模拟雷电流流过接地体时的电感效应和火花放电效应,完善了冲击条件下的接地体模型。对比结果表明,采用此仿真模型的计算结果与现场实测结果较为吻合。
Accurate determination of the impulse resistance of ground devices for transmission towers is the preconditions for improving the lightning impulse withstand level. Up to now, the non-linear impact of soil spark discharge has been neglected in most of the studies of the impulse characteristics of grounding devices. Based on an analysis of the conception and main points of a new equivalent model of grounding devices with consideration of spark discharge effects, two simulation models based on ATP-EMTP are proposed in this paper, which can well simulate both the induction and spark discharge effects under the lightning current. It is proved through comparison that the simulated results with the proposed models are in good agreement with the measured data in the field.
出处
《电力建设》
2010年第5期22-25,共4页
Electric Power Construction
