Abstract
The life estimation of power components, such as XLPE cables, has recently received a great deal of attention. However, there is a gap about introducing a comprehensive harmonic-based life estimation of electric arc furnaces (EAFs)’s power cables. Because of the EAF cyclic operation and its current harmonics, the convectional life estimation method might not be adequately precise. This article aims to fill such a knowledge gap by developing a harmonic-based life estimation of EAf's power cables considering free and non-forced convection, over-voltages due to switchings and single line to ground (SLG) faults, and sheat bonding methods. The finite element method (FEM)-based electro-thermal analysis is used in the proposed study to estimate the loss of life (LOL) of EAF's power cables accurately. In this research, the COMSOL Multiphysics software has been used to implement the electro-thermal analysis of an actual test system. Electro-thermal analysis’ results are compared to actual measurements to validate the simulations. The comparative results infer that about 30% inaccuracy occurs in LOL estimation of EAF's XLPE cable due to neglecting the electro-thermal stresses of current harmonics. The obtained results also highlight the impacts of the sheath bonding method on the EAF cables’ LOL.
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