COMPOSITION AND MORPHOLOGY OF CAPACITOR POLYMER FILMS’ INFLUENCE ON THE THERMOSTABILITY OF THEIR SHORT-TERM ELECTRIC STRENGTH
DOI:
https://doi.org/10.15588/1607-6761-2016-1-3Keywords:
polymer films, short-term electric strength, breakdown, impregnated film dielectric systemAbstract
The implementation of purposeful actions set with the view of the level of modern electronics’ and electrical insulating materials’ development increasing requires a clear understanding of the nature and character of destructive processes in the dielectric. The thermal stability of the components of impregnated polypropylene – polyethyleneterephthalate dielectric system during their thermally stimulated interaction was studied in the work for the first time. The criterion parameters are proposed and validate, allowing to estimate reliably the stability of operational properties of capacitors’ polymer films of film impregnated dielectric systems – short-term electric strength of the film and the coefficient of the relative light transmission of electrical insulating liquids. Changes of short-term electric strength of polypropylene and polyethyleneterephtalate films are analyzed during their thermoaging in the petroleum oils medium. Statistically reliable data on the form of the kinetic dependences of polymer films’ short-term electric strength are obtained. The influence of morphological features of the film’s surface on the thermal stability of a film, impregnated with a dielectric liquid, is established. Higher thermal stability of operational properties of the impregnated film dielectric system, based on the one of the investigated polymer films is projected reasonably.The obtained results are the basis for the development of complex procedure aimed at the improving the operability of oil-filled electrical equipment with polymeric dielectric, namely the method of entrance control of polymer film material, for example, for the production of power capacitors.
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