Computation of the split factor of earth fault currents by considering the proximity effects

To determine a safe substation grounding grid in power systems, it is important to compute the split factor for earth fault current including the proximity influences among the grid and the earthing systems of the incoming/outgoing transmission lines'' towers. In this paper, a novel, simple and accurate method is developed for computing this factor that can correctly take into account the proximity effects. The results are compared with those that have been published (for the cases that they are able to compute) which show good agreement and accuracy.