Abstract
This research was carried out during the realization of a project with the aim of developing a method of drying cellulose insulation in power transformers by using synthetic ester. Unfortunately, during the drying process, the ester is systematically contaminated with mineral oil, which reduces its water absorption. Information on the oil concentration in the mixture is needed in two cases: when deciding how to treat the mixture, and during the treatment. The article presents two methods: (1) based on the measurement of the mixture density, and (2) based on the measurement of a capacitor immersed in the mixture. The most important scientific achievement of the work is the proof, by way of experiment, of the existence of a relationship between the concentration of mineral oil and (1) the density of the mixture, and (2) the capacity of the capacitor immersed in it. These relations are presented in the form of equations for which the error calculus showed that the uncertainty of measurement for both methods did not exceed 3 p. %. Due to the similar measurement error of both methods, the authors recommend the capacitance method as easier to use, especially online.
Highlights
IntroductionPublisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations
The measurement results of the density of mineral oil and synthetic ester mixtures for different mineral oil concentrations and temperatures are shown in Table 1 and Figure 3
We analyzed the methods that could be used to assess the concentration of mineral oil in its mixture with synthetic ester: gas–liquid partition chromatography, infrared spectroscopy, refractometry, measurement of liquid density, and measurement of the capacitance of a capacitor immersed in the liquid
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. The aim of this research was to develop a method for assessing the concentration of mineral oil (MO) in synthetic ester (SE) in their mixture. The research was carried out as part of a project aimed at developing a new service for drying the solid insulation of distribution transformers with synthetic ester as a drying medium. The methods used to dry the solid insulation of transformers are presented in [1,2,3,4,5]
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