Still have questions about the Split factor or EPR study and what measures should be taken to comply with the standards ?
Split factor is an important term to be determined when we have to design an earthing system that have an auxiliary path for the fault current. Split factor is essential for avoiding over designing the earthing conductor and determining the actual Earth Potential Rise (EPR) at the substation and indicate about the EPR around the auxiliary path.
In addition, it ensures the compliance of any transfer voltage or EPR along the auxiliary path. Split factor depends upon the self-impedance of the overhead earth wire , and mutual impedance per meter between overhead earth wire and phase conductors.
Earth Potential Rise (EPR) also called ground potential rise (GPR) occurs when a large current flow to earth through an earth grid impedance. The potential relative to a distant point on the Earth is highest at the point where current enters the ground and declines with distance from the source.
Ground potential rise is a concern in the design of electrical substations because the high potential may be a hazard to people or equipment.
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