Owing to the random bundling of the cable bundle, the different conductors within the cable present non-parallel distribution structural features. Such a structural feature leads to different cross-sectional structures at different positions along the line. The variations of spacing between different conductors and the height from the ground can lead the distribution parameters to change. This requires that when solving the electromagnetic coupling of the cable bundle, the cable bundle should be divided into multiple grid segments along the line, and the distribution parameters should be calculated according to the cross-sectional geometry information at different grid segment positions.

On the basis of the integration of the transmission line model and the distributed parameter model, the distribution parameters of different mesh segments are calculated according to the cross-sectional structure of different mesh segments of the cable in this paper. When the parameters are brought into the transmission line model, an electromagnetic coupling model suitable for non-parallel cable structures is established. In order to verify the accuracy of the model, a unit cable structure from real cable with non-parallel distribution characteristics is designed. The calculation results from the proposed model are compared with the calculation results from the full-wave algorithm and the experimental results, showing they are in good agreement with each other.

In order to understand the influence of the cable non-parallel structure characteristics on the response of electromagnetic coupling to cable, the comparison of electromagnetic coupling response results between the parallel cable and non-parallel cable structures are made and analyzed, showing that the non-parallel structure characteristics of the cable have a significant effect on the electromagnetic coupling. It is confirmed that the influence of the non-parallel cable structure characteristics must be considered in the electromagnetic coupling simulation of the real cable.