Abstract

In a previous paper <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1</sup> the dielectric properties of some low loss polymer films in oil were reported as a function of electrical stress and temperature, based on data obtained over relatively short exposure period. At about the same time some initial data from this laboratory and from others showed that extended exposure to elevated temperature and voltage stress caused unexplained increases in dissipation factor for many polymer and oil combinations. Increase in dissipation factor with time was shown to be a problem common to many polymer-oil systems that were exposed to high-voltage stresses (500 V/mil) and elevated temperature (100°C).

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