基于时谐场计算方法的超高压输电线磁场影响因素分析

Study on Factors Affecting of EHV Transmission Lines' Magnetic Field Based on Time-harmonic Field Calculation Method

随着输电线路电压等级的提高,输电线电磁场环境的研究逐步得到重视。本文根据悬链线方程,将超高压输电线的三维工频磁场近似为准静态场,用时谐场的计算方法建立考虑弧垂的超高压输电线下方磁场三维计算模型。仿真分析了导线排列方式、对地高度、相序、线路结构等因素对空间电磁场大小和分布的影响。结果表明,导线的对地高度和结构类型工频磁场影响显著,因此,提高导线的对地高度,合理安排相序和选用合适的结构类型可以有效地降低交流输电线下的磁感应强度。

With the transmission line voltage increases, power line electromagnetic environment research gradually get attention. Based on catenary equation, the three-dimensional frequency magnetic field of the EHV transmission lines of approximate quasi-static field. Use time-harmonic field calculation method to establish consideration sag below the magnetic field calculation model, of EHV transmission lines. Simulation of the wire arrangement, ground height, phase sequence, line structures and other factors on the size and distribution of the electromagnetic field. The results show that the ground wire height and structure type frequency magnetic field significantly affected. Therefore, improving the wire-toground height, reasonable arrangements for phase sequence and choose the appropriate type of structure can effectively reduce the intensity of magnetic induction under the AC power line.