交流线路与 ±800 kV直流线路共用走廊的情况将在我国出现，因此需要研究该种线路地面混合电场的计算方法，以满足工程设计和环境保护需要。在分析同走廊架设的交流线路与±800 kV直流线路相互影响的基础上，提出了一种计算该类线路地面混合电场的方法。通过对比使用该方法得到的计算结果与不考虑两种线路相互影响时的计算结果，得到如下结论：相对于忽略交直流线路的相互影响，当考虑其相互影响时，在同走廊交直流线路中心附近，地面混合电场的瞬时最大值横向分布有波动；两种计算方法得到的地面混合电场有效值分布曲线基本重合；在一个交流周期内，同走廊线路地面混合电场的最大值与单独 ±800 kV直流线路地面合成电场的最大值差别很小。

Parallel adjacent erection of AC transmission lines and ±800 kV DC transmission lines in the same corridor will occur in China, so the calculation method for the hybrid electric field over the ground under this type of lines should be studied so as to satisfy the requirements of engineering design and environmental protection. Based on the analysis of mutual influences between AC transmission lines and ±800 kV DC transmission lines in the same corridor, a calculation method is proposed. Through the comparison between the calculation results achieved with this method and the corresponding calculation results obtained when the mutual influences between AC transmission lines and ±800 kV DC transmission lines are neglected, some conclusions can be drawn as follows: compared with the calculation results obtained when the mutual influences are neglected, near the center of AC transmission lines and ±800 kV DC transmission lines in the same corridor, the lateral distribution of the instantaneous maximal values of the hybrid electric field obtained with the proposed method fluctuates; the lateral distributions of the virtual values of the hybrid electric field obtained respectively with the two different calculation methods almost overlap completely; the difference between the maximal value of the hybrid electric field in an AC cycle under this type of lines and the maximal value of DC electric field in the presence of space charge produced by single ±800 kV DC transmission lines is very small.