The Resistance of Steel-Aluminum Conductors under Non-Sinusoidal Operating Conditions
DOI:
https://doi.org/10.24160/0013-5380-2026-9-76-86Keywords:
steel-aluminum conductor, overhead power line, resistance, higher harmonics, power losses, skin effect, numerical simulationAbstract
The article addresses the problem of more accurately determining the resistance of steel-aluminum conductors of overhead power lines under non-sinusoidal operating conditions. Additional active power losses in wires are caused by higher-order harmonic components of current, which result in redistribution of current density over the conductor cross-section and intensification of the skin effect. A mathematical model is developed that accounts for the frequency dependence of resistance, as well as conductor design features and current distribution between aluminum strands and the steel core. The study was carried out through numerically simulating the electromagnetic processes using 2D and 3D finite element models. The regularities of current density redistribution as a function of frequency and temperature have been established. It is shown that with a growth of frequency, the current concentrates in the near-surface regions of aluminum strands, leading to increased losses in the conducting part and a reduced contribution of the steel core. The influence of conductor design parameters on the resistance increase coefficient is determined. A comparison of 2D and 3D simulation results demonstrates the significance of taking into account the longitudinal magnetic field component. The obtained results can be used to refine transmission line parameters and improve power loss calculations in electric power systems.
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