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Article title METHOD OF DIAGNOSTICS AND FORECASTING OF THE THERMAL BREAKDOWN IN INSULATING MATERIALS CAUSED BY PARTIAL DISCHARGES
Authors M. N. Dubyago, N. K. Poluyanovich
Section SECTION III. METHODS AND MEANS OF FLAW DETECTION AND NON-DESTRUCTIVE TESTING
Month, Year 08, 2017 @en
Index UDC 620.192.4
DOI 10.23683/2311-3103-2017-8-179-189
Abstract Theoretical justification of the processes and mechanism of electric breakdown in insulating materials is given. The proposed mathematical model and quantitative integral characteristics of partial discharges (PD) in insulating materials and prediction of the appearance of inclusion is shown. On the basis of the calculation of the characteristics of the CR, the connection between the change of the ignition voltage of the CR Ux and the apparent charge q the size of the defect in insulation, as well as changes in the ignition voltage of the CR Ux and the apparent charge q by the dielectric constant ε of the insulation are provided. The ignition voltage allows determining the thickness of the inclusions, and the apparent amplitude of the Czech Republic, their bit area, that is, all geometric features of the inclusions are known. Analysis of the results showed that the measurement parameters of the CR allows the complex to assess the impact on the insulation materials of different factors and determine the degree of degradation. CHR is a measure of the degree of electrical aging and intensity of external influences mechanical, thermal, etc., has a significant impact on the formation and development of defects of isolation. It is shown that the ignition voltage allows determining the thickness of the inclusions in the insulation material, and the apparent amplitude of the CR determines their discharge square on the base. Developped is an integrated approach for diagnostics of power cable lines (CLA) and the algorithm of studying the emergence and development of breakdown in which mathematical models allow determining the geometrical characteristics of inclusions and quantifying the residual re-SORS SKL. Proposed criteria (voltage occurrence of partial discharges, partial discharges, ageing coefficient; the nonlinearity coefficient) allow determining and predicting the residual resource-interval of time for the latent defects development.

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Keywords Diagnostic method; forecasting; thermal breakdown; insulating materials; par-tial discharges.
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