Study on the Factors Influencing the Oil Flow Chargeability of Ester Insulating Oil
In order to study the electrification tendency of environment-friendly ester insulating oil,an oil flow chargeability test platform is built.By selecting two kinds of commercial ester insulating oil and mineral insulating oil,including FR3 natural ester,Midel 7131 synthetic ester and Karamay insulating oil,the influence of key factors such as oil paper aging degree,flow rate and temperature on the oil flow electrification of ester insulating oil is analyzed.The results show that the viscosity of ester insulating oil is high.Under the action of oil flow,the friction contact between oil and paper is further increased,and the charge separation at oil-paper interface is accelerated,resulting in a significantly higher electrical charge than mineral insulating oil,of which natural ester is the highest,followed by synthetic ester.With the increase of oil flow rate,the charge separation at the oil-paper interface is intensi-fied,and the electrification tendency of ester insulating oil is enhanced.The increase of the test temperature will accelerate the ioniza-tion process of polar molecules in the insulating oil,resulting in an increase in the electrification tendency of the insulating oil.With the increase of the temperature,the viscosity of the insulating oil will decrease,resulting in the weakening of the contact friction of the oil-paper,and its electrification tendency will decrease instead.The increase of the aging degree of oil paper accelerates the formation of aging polar products in the oil,and then accelerates the dissociation of impurity molecules,resulting in the increase of the number of intrinsic ions and impurity ions in the oil,thus increasing the degree of oil flow electrification.
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