Power Transformer Partial Discharge Fault Diagnosis Based on Multidimensional Feature Region

Figure 3

The PD analog signals of EMD decomposition results. Note: in the figure, the scale of the vertical axis is the same as the raw signal; the horizontal axis does not have unit, the numerical meaning only on behalf of the sample points.

(a) Analog signals served as single exponent attenuation type

(b) Analog signals served as single exponent vibration type