 This paper proposes a new analytical model to accurately estimate the temperature distribution inside a multi-stranded cable carrying direct current, DC, affected by a high-frequency ripple. The model is based on the equivalent AC cable resistance, which is derived from the general treatment of multi-stranded multi-layer windings. It is shown that this model yields accurate results when compared to the complete finite element method, FEM, simulation. Furthermore, it is demonstrated that the proposed model reduces the computational burden of the thermal simulation by a factor of 4 with respect to the complete FEM routine. This article was authored by Eamon Welle Fidele, Luigi Pod Noia and Renato Rizzo.