Abstract
The selection of insulant for any power system required its characterization in addition to its testing; the efficient and longeval span of the insulant is vital even under extreme conditions. This paper characterizes the Polymer-based solid insulant via Partial Discharge (PD) measurement using artificially created stress condition with the CIGRE-II based electrode system over the polymer-based insulation sheets having simulated cavities of different configuration. Assessment of insulation using PD features provides pre-breakdown situation and provide capability to comprehend the mechanism of insulant’s debilitation. The digital PD system is modern diagnosis toolkit (MPD 540) based on IEC 60270 with the competency of filtering internal PD signals from external Interference and Discharges implement for collecting data. The evaluated PD voltages for artificially created voids vary in number and size in each polymer based dielectric sample to realize PD model. The controlled sized cavities significantly influenced the PD inception and extinction voltage with variable size and a different number of cavities extant in dielectric samples. The possibility of PD process continuum or extinction after each discharge event in insulation predicted using Weibull probability distribution for each distinct size cavity. The cylindrical cavity’s diameter along the direction of the electric field significantly deteriorates the reliable operation of insulation as compared to its depth.
Published Version
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