To further study the power frequency electric field strength beneath the extra-high voltage(EHV)transmission line and its improvement measure,the parameters of the transmission line are calculated according to the theory of electromag-netic field to obtain voltage distribution along the line. Considering the voltages along the line are different,the power frequency electric field strength at 1.5 m beneath the transmission line is analyzed with charge simulation method. The charge simulation method was verified with ANSYS software. It is found from the verification results that the erection of just a part shielded wire can meet the requirement,which can save the cost. The reasonable position of the shielded wire was obtained with analysis. Fi-nally,the power frequency electric field curve of transmission line with a part erection shielded wire beneath it was gained by Matlab simulation. The research results show that part erection shielded wire can improve the power frequency electric field of the transmission lines.%为深入研究超高压输电线路下方工频电场强度和改善措施,首先根据电磁场理论对输电线路的参数进行计算,得出沿线电压的分布.考虑沿线电压不同后,采用模拟电荷法对输电线下方1.5 m处的工频电场强度进行分析,并利用ANSYS软件对模拟电荷法进行验证.结果发现只需部分架设屏蔽线就可以满足要求,这样也可以节省成本.然后分析得出架设屏蔽线的合理位置.最后利用Matlab仿真得出输电线路下方部分架设屏蔽线的工频电场曲线,研究结果表明,部分架设屏蔽线可以改善输电线路的工频电场.
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