中文摘要：

同走廊两回±800 kV直流线路不久将在中国出现,需要对该种线路的地面合成电场进行研究,为工程设计和环境保护提供技术依据。对同走廊两回直流线路极导线按不同方式布置时的地面合成电场进行模拟试验,获得了其横向分布规律。给出一种同走廊两回直流线路地面合成电场的计算方法,该方法考虑了影响此种线路地面合成电场的多种重要因素,模拟试验验证了所提计算方法的有效性。采用该方法分析了同走廊两回±800 kV直流线路地面合成电场的分布特点。结果表明：不同的极导线布置方案不会显著影响同走廊两回直流线路地面最大合成电场的大小,但会影响其分布位置;同走廊两回直流线路地面最大合成电场的绝对值与单回直流线路运行时差别不大;两回±800 kV直流线路同走廊临近架设与相距较远距离架设相比,能大幅减少线路走廊宽度和工程拆迁费用。

英文摘要：

Two-circuit ±800 kV DC transmission lines in the same corridor will be applied in China in the near future,so the total electric field at the ground level under lines of this type needs to be studied to provide technical support for project design and environmental protection.Through the simulation tests on the total electric field at the ground level under two circuit DC transmission lines in the same corridor with different pole arrangement schemes,the lateral distribution regulation was obtained.A calculation method for this total electric field was proposed with the consideration of various important affecting factors,and its validity was proved by simulation tests.The distribution characteristics of the total electric field at the ground level under two circuit ±800 kV DC transmission lines in the same corridor were analyzed by using the method proposed in this paper.Analytical results showed that different pole arrangement schemes for two circuit DC transmission lines in the same corridor will not notably influence the magnitude of the maximum total electric field at the ground level,but will influence its distribution location.The absolute value of the maximum total electric field of this kind is not greatly different from that of a single circuit in normal operation.The parallel adjacent erection for two-circuit DC transmission lines in the same corridor,compared with the far-away erection,can greatly reduce the corridor width and the project removal expense.