Evaluation of Dielectric and Insulating Characteristics of New Insulating Material assuming and Environmentally-friendly Transformer

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1. Dielectric and insulating characteristics of rapeseed oilIt is clear that electrical breakdown strength of rapeseed oil was almost comparable to mineral oil used as a comparison material and that dielectric strength and stability are improved by removing air bubbles from both rapeseed oil and mineral oil. Dielectric strength in older oil is decreased than that of newer oil due to oxidation and moisture absorption.2. Dielectric and insulating characteristics of polymer nanocompositesSome kinds of polymer nanocomposite materials are prepared to shape of experimental samples, and dispersibility of the nanofillers is observed by SEM in each specimen. The nanocomposites have excellent the partial discharge resistance, and this property is deeply related to electric field distortion around the nano-particles.3. Dielectric and insulating characteristics of a composite insulating system of liquid and solidThe amount of rapeseed oil can be decreased without reducing dielectric breakdown strength, when the area between two sphere electrodes is not filled with spherical glass particles. Lines of electric force concentrate on glass particles of higher relative permittivity, and high electric field arise around the glass particles. As a result, it is considered that the dielectric breakdown occurs easily on the surface of the glass particle.