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The surface resistance of nanoparticles filled Poly Propylene (PP) to Partial Discharges(PD) is investigated in this work. PP films with different percentages of organoclay filled PP films were aged under 60 Hz AC voltages. Each sample was continuously aged for 8 hours with Rod-Plane profile electrodes in presence of surface discharges. Several characteristics such as Qavg, Qmax, Weibull distribution parameters of PD distributions were collected continuously with time using a Computerized PD Detection System. The change in the Breakdown strength due to aging by Partial Discharges was determined by using a ASTM D-149 breakdown strength measurement system using standardized electrodes for films. The results of experiments, statistical analyses as well as the model for the progression of aging in terms of observed and surface defects caused on the samples due to PD for samples with different levels of nano-fillers has been analysed.

Introduction of nanofillers has shown to improve the Breakdown Strength of unaged Polypropylene (PP) films. However, subjecting these samples to aging by surface discharges will eliminate this advantage [1]. PP samples with 0%, 2% and 6% organosilicate nanofillers are aged continuously with surface discharges. Partial Discharges (PD) time history records obtained are analyzed within the framework of Time Series Analyses. This work has resulted in development of an algorithm to forecast the future trends of statistical parameters obtained by PD measurement system. Electric field distribution affects PD behavior which is confirmed by microscopic and profilometric study of degradation volume.

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