Application Research on Single-phase Grounding Fault Line Selection Technology in Small Current Grounding System

Abstract

In order to improve the line selection accuracy of the fault line selection device for small current grounding systems, a line selection method based on information fusion is proposed, that is, several complementary single line selection methods based on transient and steady state characteristics are used for comprehensive line selection. Firstly, wavelet method, zero-sequence active component method, and fifth harmonic method are used according to the characteristic definition of transient and steady-state fault characteristics, and then the rough set theory algorithm model is used to fuse the faults with various fault characteristics to select the fault line. In Matlab, a distribution network model was built and a program of fusion algorithm was written for simulation analysis and verification of route selection methods. The simulation results show that the line selection method based on rough set theory and information fusion has high accuracy and good application value.