APPLICATION OF DSP AND WAVELET PACKETS FOR FAULT IDENTIFICATION

Applying the good property of frequency division of wavelet packets, transient electrical quantities, which appears in the distribution networks occurring a single phase to ground fault, is decomposed to obtain the outputs of different frequency bands. In view of energy, using waveform recognition, the different frequency band is chosen corresponding to the distribution system with the different neutral grounding mode. According to the requisition of wavelet algorithm for hardware, the advantages of DSP, digital signal processing function and high calculating speed, make the algorithm possible to be fast processed in time. Dynamic mould laboratory emulation results showed that the fusion strategy exhibits excellent property over the existing criteria.