500kV同走廊并行交流输电线路工频电场的仿真计算研究

Simulation and Calculation of Frequency Electric Field for 500 kV Alternating Current Parallel Transmission Lines in the Same Corridor

为掌握同走廊并行交流输电线路工频电场分布状况,建立了基于模拟电荷法的工频电场仿真计算模型,并利用实测数据进行了校验。结合重庆地区拟建的某500 k V同走廊并行交流输电线路,开展了两并行线路间距和相序对线下工频电场影响的仿真分析:ABC/CBA//ABC/CBA相序排列时,并行线路走廊中间两回的电场强度较边上两回有一定程度的降低,降低程度随着间距的增大而减小,当间距增大到一定程度时其影响可以忽略;不同相序对并行线路走廊中间的电场强度影响较为明显,在实际工程中,可以根据线下敏感点的位置选择CBA/ABC//ABC/CBA或ABC/ABC//CBA/CBA相序排列,从而确保其更好地满足环保要求。

To grasp the frequency electric field distribution characters of alternating current （AC） parallel transmission lines in the same corridor, a frequency electric field simulation and calculation model based on charge simulation is built and verified by the measured data. Simulated analysis is made about the effects of line distance and phase sequence on frequency electric field of a 500kv parallel transmission lines in the same corridor in Chongqing： in case of ABC/CBA//ABC/CBA phase sequence, the middle of the two circuits has a lower electric field intensity compared with that at the edge ; the bigger the distance, the smaller the intensity change; when the spacing increases to a certain degree, its influence can be ignored; different phase sequences have obvious impact on the frequency electric field intensity for parallel transmission lines; in practical engineering, we can choose CBA/ABC//ABC/CBA or ABC/ABC//CBA/CBA phase sequence according to the location of the sensitive point , so as to meet environmental requirements.