Electromagnetic processes in a system of two balanced circuits of a metal-sheathed communication cable are numerically studied. The mutual influence between balanced pairs is determined using the distribution of the coefficients of electric and magnetic couplings along the length of the cable, which consist of active and reactive components. Practice shows that the reactive components are much larger than the corresponding active ones. The coefficients of capacitive and inductive coupling of a cable with a metal sheath are calculated using numerical methods for solving differential equations that describe the corresponding electromagnetic processes. In developing mathematical models, it is assumed that the electric and magnetic fields only vary in the cross section of the cable. The 2D problems describing the change in the electric potential are solved, and the complex amplitude of the longitudinal component of the vector magnetic potential is found applying the finite element method in the Ansys Maxwell software package. The solution of the problem yields the distributions of capacitive and inductive connections along the cable length, from which the corresponding average integral characteristics are calculated, and their dependences on the angle of the initial phase of the location of the second pair with the first position unchanged are plotted. The influence of the metal sheath on the level of mutual interference due to the action of electric and magnetic fields has been determined.
Shcherbinin et al. (Sat,) studied this question.