Study of electrically induced orientational ordering in mineral oils on the example of ORLEN OIL TRAFO EN

Abstract

A simple model of orientational ordering of molecules in the liquid under the influence of an applied sinusoidal electric field of low frequency is presented. The predicted theoretica l dependencies of linear birefringence and light transmission coefficients on the intensity of the applied field were confirmed by experim ental data obtained for transformer oil ORLEN OIL TRAFO EN. It was found that the intensity of orientational effects in the oil depends strongly not only on the current conditions, but also on the thermal history of the sample. Furthermore it is shown that the minimum amount of dissolved contaminants ( e.g. polyethylene) strongly increases the effects . The results suggest that it is necessary to reconsider the techniques for measuring the Kerr effect in liquids associated with deformation of electron cloud, because the traditional approach does not take into account the orientational effects occurring simultaneously with the Kerr effect.