Aging Diagnosis of Insulation  Systems by PD Measurements Extraction of Partial Discharge Features in Electrical Treeing


M. Cacciari, D. I.E., University of Parma
A. Contin D. E. E. I, University  of Trieste
S. Tenbohlen*, D. Uhde, J.R. Bozzo, C. Gemme,  F. Guastavino D. I. E., University of Genova
G. C. Montanari D. I. E., University  of Bologna, Italy

ABSTRACT

The charge height values associated with PD measured during electrical tree inception and growth are processed according to the Weibull distribution. Test arrangements, based on the needle-plane electrode system, consider specimens having either a cavity at the tip or an intimate contact with insulation. It is shown that the Weibull-function parameters have close relation to discharges occurring in cavity and tree channels, and that an indication of inception of electrical trees can be obtained


Keywords: PD measured, Monitoring, PD occurring, Partial Discharge, PD-Measurement, Partial discharge height distribution, Weibull  function

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