Research on Fault Line Selection Method for Resonant Grounding System Based on Phase Current Variation Difference

For the problem of identifying high-resistance grounded fault lines in resonant grounding systems, a new line selection criterion is proposed. This criterion distinguishes the faulty line from non-faulty lines based on the magnitude of the differences in phase current variation. PSCAD/EMTDC simulation results demonstrate that this method can accurately select the fault line under various transition resistances and strong noise interference, exhibiting high accuracy and adaptability.