【摘要】 为研究工频电压对输电线路反击跳闸率和绕击跳闸率产生的影响,验证目前的试验结果,从工频叠加影响机理、蒙特卡罗法实例计算两个方面进行了计算和分析。结果显示,工频叠加影响机理分析和蒙特卡罗法实例计算的结论一致:工频电压主要提高了输电线路的反击跳闸率,而对绕击跳闸率影响不大。更多还原

【Abstract】 In order to estimate and improve the lighting performance of transmission lines,the lightning flashover rate is calculated.When lightning hits the transmission lines,the power frequency voltage always exists on the lines and the value of the voltage is random.However,the random value complicates the analysis of the influence of the power frequency on the lightning flashover rate.The Monte Carlo method,which is a classic method to solve such random problems,is introduced in our work.After modeling the lightning process of transmission lines,the calculation of the lighting flashover rate considering the influence of power frequency voltage was carried out.Moreover,the Monte Carlo method were theoretically analyzed in this study for finding out how the power frequency voltage influences the lightning flash-over rate of transmission lines and how much the power frequency voltage increases or reduces the lightning flashover rate.This study covers the voltage level of transmission lines from 110 kV to 500 kV.The results show that the power frequency voltage significantly increases the back flash-over rate of transmission lines.In engineering calculation,the ignorance of the influence of power frequency voltage on the back flashover may magnify the calculation error.The higher the voltage rate is,the larger the error is.The influence of the power frequency voltage on the shielding failure flash-over,however,is small.Therefore,if the influence of power frequency voltage on the shielding failure flashover is ignored,the calculation result is still acceptable.更多还原