Hi Ignacio, it really is very complex to get PD signals to our liking, however, I have a large database of measurements. With multiple sources that act simultaneously or individual sources. If you require something, just tell me.
Depending on limiting value signals from peak detectors, of +,- &zero sequence components, immediate on line fault type detection could be done, refer my paper,"Microprocessor based, fault type detection and load balance control of power transformer using symmetrical components".