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Study on Characteristics of Paper Degradation in Natural Ester from Palm Oil-Based Insulation Liquid

Replacing mineral oil as transformer insulation by natural ester has been an issue since a long time ago. Natural ester is not only produced from sustainable materials, but also has other advantages as its environmentally friendly characteristic and more resistant to the high temperatures compared with mineral oil. Several types of research have been conducted to find out the change of paper and natural ester characteristic under thermal aging. This paper aims to study and analyze the kraft paper degradation of natural ester-based insulation liquid characteristic under accelerated thermal aging. In the present study, the natural ester is made from palm oil. This study is also intended to determine the influence of the initial water content of kraft paper on the thermal aging. The accelerated thermal aging was conducted in a closed container with two variations of temperature 100° C and 85° C for 1344 hours. The experimental results show changes in the degree of polymerization and tensile strength of kraft paper under accelerated thermal aging. Besides, this study also aims to determine the kraft paper degradation through morphological changes on the surface by using scanning electron microscope (SEM) test.