Fault Line Selection Method for Resonant Grounding System Based on Generalized Correlation Coefficient and Energy Measure

The signal components of single-phase grounding current in resonant grounding system contain rich fault characteristic information and are difficult to be fully utilized. A method for line selection using transient fault feature information is proposed. This method achieves information mining through spatiotemporal transformation, expands observation channels, and provides sufficient fault feature information. Adopting blind source separation algorithm to obtain and amplify fault signal features, eliminating compensation effects caused by component reversal. In addition, the concept of generalized correlation coefficient was proposed, and a line selection method based on line energy factor was first proposed. Both simulation calculation and field data-based experiments verify that the method can be applied to fault line selection of grounding system under complex fault conditions of multi type feeders, and accurate and reliable line selection results can be obtained.