A. S. Deshpande Dr. A. N. Cheeran Keywords- High Voltage Insulation, Weibull Distribution, A. S. Deshpande et al. / (IJAEST) INTERNATIONAL JOURNAL OF ADVANCED ENGINEERING SCIENCES AND TECHNOLOGIES Vol No. 3, Issue No. 2, 111 - 114 It is very commonly seen in practical insulation systems, that there are more than one PD sources acting simultaneously. The patterns obtained with PD detectors A. S. Patil Partial Discharge, Electrical insulation aging, Reliability.