Selection algorithm based on correlation analysis with transient information of fault signal in neutral un-effectual grounded system

When there happens the single-phase grounding fault in the neutral un-effectual grounded system, the transient ground fault current contains the whole system´s fault characteristics. The main component of the transient phase current of health line is capacitive current to ground, considering the affect of the inductance that resist in the system, the phase current of the health feeder is so small that the waveform between its phase current and zero sequence current´s transient information shows significant irrelevant, while the waveform of the fault line shows a significant correlation. Taking advantage of this feature of small current system when there occurs the signal-phase fault, the use of correlation analysis and comparison of each line´s transient information phase current and zero sequence current correlation can select out the fault line correctly, the article use the MATLAB/SIMULINK simulation verify the correctness of the method.