A COMPARATIVE STUDY OF THERMAL AGEING PROPERTIES OF KENAF FIBER AS INSULATING PRESSPAPER IMMERSED IN MINERAL OIL

Dylan Emanuel, Christia (2023) A COMPARATIVE STUDY OF THERMAL AGEING PROPERTIES OF KENAF FIBER AS INSULATING PRESSPAPER IMMERSED IN MINERAL OIL. [Final Year Project Report] (Unpublished)

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Abstract

After liquid insulation, solid insulation is one of the most important insulation materials in transformers. This solid insulation is primarily composed of cellulose, often known as Kraft paper. To maintain resource stability, it is necessary to optimise the utilisation of raw materials. Demand for softwood is increasing, which slows down the manufacturing industry's ability to maintain production, particularly of electrical-grade products; therefore, natural fibre plants should be the greatest option for replacing the demand for softwood. Kenaf (Hibiscus Cannabinus L) is one of the non-wood lignocellulose which potential to be a new material as electrical grade product. It is necessary to comply to a few IEC requirements to ensure that Kenaf press paper is suitable for use in power transformers. The testing methods for paper insulation include Thermogravimetric Analysis (TGA), Degree of Polymerization (DP), and resistivity volume. The thermal ageing of insulation paper is also performed at a temperature of 90°C for a period of 240 hours to 720 hours. The degree of polymerization workflow is determined based on IEC Standard 60450 and the viscosity of the dissolved solution. Thermogravimetric Analysis (TGA) was used to analyse the thermal resistance of Kenaf insulation paper in order to determine the paper's ability to tolerate such high thermal pressure. Finally, the substance's resistivity is measured to determine if Kenaf insulation can insulate the conducting material. The results indicate that the degree of polymerization of Kenaf press paper is acceptable in accordance with the standard, and that the thermal resistance of Kenaf advances marginally during the second phase of degradation. The degree of polymerization generally affects the volume of resistivity.

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