Abstract: This paper presents a numerical computation method for determining the
magnetic field of high-current busducts of circular cross-section geometry, based on the
subdivision of the busduct phase conductors and screens into the conductor filaments and
the subsequent application of the mesh-current method, with the aid of the geometric mean
distance method. The mathematical model takes into account the skin effect and the
proximity effects, as well as the complete electromagnetic coupling between phase
conductors and metal enclosures (i.e., screens) of the single-phase isolated busduct system
(of circular cross-section geometry). This model could be readily applied to the
computation of the magnetic field of the Gas Insulated Transmission Lines (GIL) as well.
Keywords: high-current busduct; gas-insulated transmission line; electromagnetic field;
filament method; mesh-current method; geometric mean distance method