I. Introduction
Due to their reliable and consistent power transmission capabilities, underground cables are one of the most valuable components in the power system network. The dependability of these cables largely depends on the quality of their insulation. Any damage to the insulation generally leads to failure in the cable system, eventually leading to complete system failure [1]. Thereby, the selection of appropriate insulating material becomes a crucial consideration for the reliable operation of the entire power system network. Lately, there has been a gradual transition from the oil-impregnated paper cables to the polymer insulated cables [2]. The commonly encountered polymer options include PVC, LDPE, EPR, and XLPE. Among these, XLPE stands out as a preferred option due to its qualities, including exceptional dielectric strength, strong mechanical characteristics, strong chemical resistance, and thermal stability.