基于有限元的输电导线电磁环境评估与预测

摘要

基于有限元方法,计算输电导线周围的工频电场、工频磁场、无线电干扰和可听噪声.通过与传统计算方法和现场实测数据的比较,验证有限元法在计算导线周围工频场强时的优越性,计算结果表明:有限元法能准确反映子导线表面电场强度由于电荷分布不均引起的沿面变化,有效提高了无线电干扰和可听噪声的计算精度.并开发了输电导线电磁环境评估通用计算程序,可以准确计算各种导线布置和运行工况下的电磁环境参数,实现输电导线周围电磁环境的有效评估和预测.%Based on the finite element method (FEM) , the power frequency electric field (PFEF), power frequency magnetic field (PFMF), radio interference (RI) and audible noise (AN) around transmission lines are calculated in this paper. With comparison to the traditional method and measured data of real power lines, the reliability and accuracy of FEM is verified. Results show that the FEM can accurately reflect the changes of sub-conductor surface field strength alone the surface due to the uneven distribution of charge, and the RI and AN calculation accuracy is improved effectively because of the accuracy calculation of surface field strength. A general calculation software for transmission line electromagnetic environment assessment and prediction is developed. With the software, the electromagnetic environment parameters with all wire layouts under each operation condition can be calculated and the electromagnetic environment around the transmission lines can be assessed and predicted effectively.