Thermal ageing performance evaluation of TUK and Nomex-910 papers in natural monoesters

Abstract

This paper is devoted to a comparative analysis of thermal ageing tests of Thermally Upgraded Kraft (TUK) and Nomex-910 papers dipped in palm kernel oil methyl ester (MEPKO), at 110, 130, and 150 °C, for 96 h each. After ageing, paper breakdown voltage (BDV), oils’ dissipation factor, dielectric constant and oxidation stability were determined. Nomex’s BDV was greater than TUK BDV. However, the dissipation factor of the Nomex samples is slightly higher than that of TUK, and the dielectric constant has the opposite behaviour. In addition, the decay content of Nomex/MEPKO was greater than with TUK/MEPKO. These experimental findings indicate that Nomex can be mainly used in high voltage, and TUK in medium voltage power transformers respectively, to allow judicious use of their individual characteristics and money savings.

Improvement of the flashover threshold of TUK pressboard by using FeO3‐based nanofluid of monoesters

“…The first step, which consists of impregnating the solid insulation, is to fill the air pockets and capillaries with insulating liquids that have a much higher dielectric strength (Figure 8b,c). The result is an increase in the dielectric strength of the oil/cellulose complex [24]. However, while closing the air pockets improves the dielectric strength, it does not totally inhibit the activity of space charges on the surface of the solid insulator.…”

“…The experimental setup is the same as that presented in the previous work [28][29][30] [24] and nanoparticles [25].…”