High impedance and system asymmetry in distribution networks can distort fault characteristics

leading to erroneous faulty feeder detection. By analyzing the zero-sequence current motion trajectory during the regulation process of zero-sequence voltage

a zero-sequence voltage amplification region within the insulation tolerance range at asymmetric distribution networks is derived. By analyzing the zero-sequence current variation characteristics

a faulty feeder detection criterion based on zero-sequence current increment is constructed. Then proposing a method for high-impedance faulty feeder detection based on regional amplification of zero-sequence voltage

achieving maximization of zero- sequence current increment of faulty feeder within a zero- sequence voltage confined regulation range. A typical asymmetric distribution network scenario is simulated in the PSCAD/EMTDC and 10 kV experimental field to simulate various fault conditions. The results indicate that this method can eliminate the influence of asymmetric system parameters on faulty feeder detection and amplify the weak characteristics of high-impedance fault under different detuning conditions

achieving accurate detection for high-impedance grounding fault up to 20 kΩ.