中文摘要：

为使模拟计算结果更接近实际，需要研究雷电侵入波过电压计算模型的准确性。笔者研究了输电线路模型和绝缘子串闪络时的弧道电阻对站内设备过电压和MOA动作负荷的影响。结果表明，输电线路用LCC（Line／Cable Constants）模型模拟时，站内设备的最大过电压和MOA吸收能量比用单相等值波阻抗模拟时分别减小了22．2％和增多了24．0％；避雷器3种模型计算结果差别不大，但综合考虑计算的方便性和准确性，建议用集中模型模拟避雷器；弧道电阻对站内设备的过电压影响也很显著。

英文摘要：

To understand the accuracy of diffe rent models for calculating lightning invading over-voltage in transformer substation, the effects of different transmission line models and electric-arc resistance due to flash over of insulator-string on the over-voltage on equipments and MOA load in a 750 kV AIS substation are studied. The results show that the maximum over-voltage on equipments is 22.2% lower when the transmission lines are simulated with LCC （Line/Cable Constants） model than with single phase wave impedance model, while the ,maximum energy absorbed by MOA is 24.0% higher. Although the calculation results from three arrester models are approximate each other, the lumped model is recommended considering its convenience and accuracy. The effect of electric-arc resistance on the over-voltage on equipments can not be ignored.