Faulty Feeder Detection Based on Multiple Transient Characteristics Fusion in Resonant Grounding Systems

To address the issue of low accuracy of faulty feeder detection methods based on single fault characteristics, a faulty feeder detection method for resonant grounding systems based on multiple transient characteristics fusion was proposed. First, the transient zero-sequence current fault characteristics of both faulty and healthy feeders during single-phase-to-ground (SPG) faults were analyzed. Then, the transient zero-sequence current of each feeder was decomposed into intrinsic mode functions (IMFs) using variational mode decomposition (VMD), and a new signal was constructed by combining IMF1 and IMF2. Subsequently, transient energy and waveform similarity fault characteristics were extracted from the constructed signal, and a faulty feeder detection criterion based on multiple transient characteristics fusion was developed. Finally, extensive simulations and field data were used to verify the proposed faulty feeder detection method. The results demonstrated that the method was robust against fault resistance, fault inception angle, fault location, and noise, achieving high accuracy in faulty feeder detection. This method can be widely applied to detect faulty feeders in resonant grounding systems.