Description: With the development of power systems and the
extensive application of nonlinear elements in the electricity
system, the problem of ferroresonance do harm to the network
and electricity facilities has become more prominent. Wavelet
analysis has good time-frequency localization characteristic, so it
is suitable for fault analysis of power system. This paper is base
on in the neutral point unearthed system, which is excited by
single phase grounding fault, take analysis of the value of neutral
point with the Daubechies wavelet analysis. Simulation results
show that with wavelet transforms the occurrence of Ferro
resonance time can be detected and the frequency resonance can
also be determined.
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