Tkachenko O. Magnetic field of high-voltage cable lines with two-point bonded cable shields

The thesis is devoted to improving of methods for solving the problem of analytical modeling and calculation of a high-voltage three-phase cable line consisting of single-core cables with two-point bonded cable shields. The produced analytical model allows to calculate the electric currents induced in shields of cables and to determine the magnetic field distribution for the arbitrary arrangement of cables. The exact expression for the shielding factor of magnetic field of trefoil cable line with two-point bonded shields is obtained. Also in thesis received a simplistic expression for shielding factor of the magnetic field of the flat cable line with two-point bonded shields by the Clark transformation. Its error is within 5%. The possibility of a 2-4-fold increase of shielding factor of magnetic field by installing ferromagnetic cores on cables is justified theoretically and experimentally. The expressions for calculating the shielding factor in this case are obtained. They depend on the parameters of ferromagnetic cores, parameters of cables and arrangement of cables. The verification of the proposed analytical model and calculated ratios by numerical simulation and experimentally is performed. A methodology for calculating the magnetic field of the cable line and the root-meansquare amplitude of shield currents with two-point bonded cable shields are developed.