Underground high-voltage cables are widely used due to the increasing need for power transmission in densely populated urban regions. In order to fulfil these increasing power requirements, using many parallel connections in the same phase has become standard procedure. The stability of the power system may be compromised by issues with this strategy, such as large sheath circulation currents and uneven current distribution. In order to ensure the steady operation of power systems, this paper looks into the optimisation of laying modes for multiple circuit in-phase multiple parallel cables. Different configurations of parallel cables are investigated to evaluate their effects on line performance through the modelling of electromagnetic transient processes using electromagnetic transients program (EMTP) calculations. This paper analyzes five different arrangements for cables: hexagonal, triangular both top and bottom, horizontal (up and down), triangular left and right, and triangular inverted. The main focus is on how these arrangements affect the even distribution of electrical current. The study reveals that the way cables are laid out impacts the flow of electricity and the balance between phases. If there are disparities in the resistance or energy storage of the cables, it can lead to issues such as reduced electricity transmission, safety concerns, and shorter cable lifespan. Therefore, careful planning of cable configuration is essential to ensure efficient usage, high capacity for electricity transmission, and prolonged durability.