A Novel Technique to Distinguish between Transient and Permanent Faults Based on Signal Wavelet Singularity Detection

This paper presents a simple technique for distinguishing the transient faults and permanent faults on transmission lines. Based on signal wavelet singularity detection, the modulus maxima of the wavelet transform at singular points in the fault phase voltages under different earth resistances is simulated. A system design based on signal wavelet singularity detection and fault phase selector is proposed to realize the single-pole adaptive reclosure. Theoretical analysis and MATLAB simulation results show that the proposed technique is correct and valid.