Working Paper Article Version 1 This version is not peer-reviewed

Assessment of Concentration of Mineral Oil in Synthetic Ester Based on the Density of the Mixture and the Capacitance of the Capacitor Immersed in It

Version 1 : Received: 17 February 2021 / Approved: 22 February 2021 / Online: 22 February 2021 (11:17:04 CET)

A peer-reviewed article of this Preprint also exists.

Moranda, H.; Gielniak, J.; Kownacki, I. Assessment of Concentration of Mineral Oil in Synthetic Ester Based on the Density of the Mixture and the Capacitance of the Capacitor Immersed in It. Energies 2021, 14, 1839. Moranda, H.; Gielniak, J.; Kownacki, I. Assessment of Concentration of Mineral Oil in Synthetic Ester Based on the Density of the Mixture and the Capacitance of the Capacitor Immersed in It. Energies 2021, 14, 1839.

Journal reference: Energies 2021, 14, 1839
DOI: 10.3390/en14071839

Abstract

The research results presented in the article were carried out during the realization of the project, the aim of which is to develop a method of drying cellulose insulation in power transformers with the use of synthetic ester. This method uses a very high water absorption of the ester. During the drying of transformers, the ester is systematically contaminated with mineral oil, which gradually loses its ability to absorb water. Information on the oil concentration in the mixture is needed in two cases: at the stage of making a decision on the treatment of the mixture and during its treatment. The article presents the results of investigations of two methods: 1) based on the measurement of the mixture density, and 2) based on the measurement of the capacitance of the capacitor immersed in the mixture. The conducted research shows that the method of measuring the density of the mixture gives an uncertainty of 2.6 p. %, while the method of measuring the capacitance of a capacitor gives an uncertainty of 2.2 p. %. A significant advantage of the method of measuring the capacitance is the possibility of using it online to control the ester treatment process.

Subject Areas

oil-paper insulation; drying of the transformer; synthetic ester

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