Analysis of partial discharge signals from multi-defect insulating systems

In practice, there may be various defects in an insulating system, so that the PD signals can be produces from these defect simultaneously. Regarding these situations, we have to discriminate the type of defect as well as to determine whether the PD occurs or not. In our research, some analysis results of the PD signals from multi-defects insulating system will be presented. We measure the PD signals using three kind of electrode system; IEC(b), Needle-Plane and mixed electrodes. To simulate multi-defect systems, we combine two electrode systems and apply test voltage simultaneously. Neural network, statistical analysis methods will be tested, and the possibilities and limitations of each method will be clarified