This paper presents an automatic fault detection method based on the analysis of the wavelet coefficient energies of the phase voltages and currents. The method detects developing faults and multiple transient disturbances such as a fault followed by an automatic line reclosing in a single oscillographic record. The method also sort fault from some power quality disturbances such as voltage sags and switching transients. The times regarding the fault inception and clearance are also identified. Records from a nonspecific line in a generic network with different sampling rates and rated voltages can be evaluated without distinction. The performance of the method was evaluated for both actual and simulated data and good results were obtained.
Developing fault; records with multiple disturbances; wavelet transform
