超高压输电线构成我国电力网络体系的基本框架,其空载线路合闸过电压直接决定了输电线路的绝缘水平.首先从幅频特性角度分析了合闸相位和合闸电阻对过电压中工频分量和自由分量的影响;并且从数学角度对模型进行理论计算和分析,验证了仿真的正确性.其次,从数学理论结果分析了合闸相位和合闸电阻双重因素对合闸过电压的具体影响,分别针对三相输电线路中,合闸过电压最大峰值与最小峰值制定出理想合闸相位图.利用PSCAD/EMTDC软件进行仿真验证,证明其准确性和实用性.%500 kV EHV transmission lines has become the basic framework of power network system in our country.The switch-on overvoltage of off-load transmission line determines the insulation level of the transmission line.Firstly,the influence of the switch-on phase and resistance on the overvoltage of the off-load transmission which includes the freedom component and power frequency components is simulated in the perspective of the amplitude and frequency characteristics,and the mathematical model for theoretical calculation and analysis validate the correction of analysis.Secondly,the specific influence of the double factors of switch-on phase and resistance on the switch-on overvoltage are analyzed from the result of the mathematical theory.The ideal switch-on phase diagram which describes the peak maximum and minimum switch-on overvoltage of the three-phase transmission line is made.
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