Magnetic field calculation of cable line with two-point bonded shields

摘要

This paper discusses the mitigation of the cable line magnetic field by the two-point bonding of shields of cables. We produce a two-dimensional mathematical model of the cable line with two-point bonded cable shields based on the Maxwell-Ampere equation. The calculation of induced shield currents and magnetic field is carried out by the computer simulation using the finite element method. This allows to take into account a nonuniform shield current distribution and therefore to obtain the most accurate solution, as evidenced by the coincidence with the experimental research. We consider the most common case of the flat cable line and tabulate the dependence of the magnetic shielding factor from the cross-sectional area, the diameter of shields, and the distance between cables.