The frequency electric field of 500 k V overhead transmission lines in northwest district exceeds limit in some residential areas.A model for calculating the power frequency electric field simulation was established based on the charge simulation method. A simulation calculation software was developed. The accuracy of the prediction software is verified by the measured data. In order to ensure the frequency electric field distribution in courtyard satisfies the requirements of environmental protection standard, software is used to simulate and analyze the power frequency electric field. Finally, the reasonable height is determined as not less than 20 m for the transmission lines. The example proved that the software has great value in practical application, which can provide technical reference for environment impact assessment and the planning and design of overhead alternating current transmission lines.%针对西北地区某500 k V架空输电线路下方民房院坝工频电磁场超标问题, 基于模拟电荷法建立了工频电场仿真计算模型, 并开发了仿真计算软件.通过现场实测数据与仿真计算结果的对比, 验证了软件预测的准确性.为保证居民院坝工频电场分布满足环保标准要求, 利用软件对不同高度架空输电线路下方的工频电场进行了仿真计算与分析, 最后确定了合理的线路架设高度为不低于20 m.该工程实例的分析证明了开发的软件具有很好的实际应用价值, 可为交流架空输电线路的规划设计和环境影响评价提供技术参考.
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