OHEW types and its implications on pole EPR under pole fault

High Voltage (HV) transmission mains form important assets in electrical networks. The existence of these infrastructures within the community necessitates earthing design to ensure safety compliance of the system. OHEW (overhead earth wire) forms parts of the HV transmission mains, whereas the OHEW plays an important role when it comes to fault current distributions and to lightning protections for the transmission mains assets. Different types of OHEW have different impacts on the earth potential rise (EPR) of the transmission mains under pole fault. This paper endeavours to provide information in regards to: pole EPR under pole fault, the definition of finite and infinite transmission lines, and the impact of the OHEW types on the finite and infinite determinations. Furthermore, the pole fault EPR assessments under different OHEW type are discussed. A case study is addressed to show the different impacts on the pole EPR under different OHEW systems.