Design of electric power transient signal wavelet analysis instrument based on LabVIEW and VC++;

Wavelet transform analysis instrument of electric power transient signal based on virtual instrument;

The minor wave varies in the analysis applying principle in momentary state of electric system malfunction signal;

This paper presents a novel algorithm of identifying the inrush current and short circuit current caused by internal fault on the basis of transient detection using morphological gradient, meanwhile transient current signals are extracted by use of morphological opening and closing algorithm.

Power system transient signal analysis based on AOK TFR;

Power spectral estimation of power system fault transient signal;

The Method of Detection on Transient Signal in Stationary Random Noise;

To distinguish fault transient signals from non-fault transient signals, on the basis of researching various transient signals and their characteristics the authors establish an EMTDC model to simulate 500kV transmission line.

Utilizing the time-frequency localization ability of wavelet analysis,on the basis of multi-scale expression of transient signals,the concept of wavelet energy entropy(WEE)for feature extraction is defined;integrating WEE with fuzzy logic,a new method to select faulty phase is formed.

Based on multi-scales expression and the definition of two post-analysis methods (energy statistic and wavelet entropy), the EMTDC simulated models were built about five transient signals including single phase grounding, switch operating, capacitor.