PHYSIOCHEMICAL AND ELECTRICAL PERFORMANCE OF KENAF FIBER AS INSULATING PRESSPAPER IMPREGNATED WITH MINERAL OIL

Fatini Izzati, Kip (2023) PHYSIOCHEMICAL AND ELECTRICAL PERFORMANCE OF KENAF FIBER AS INSULATING PRESSPAPER IMPREGNATED WITH MINERAL OIL. [Final Year Project Report] (Unpublished)

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Abstract

Cellulose-derived materials, including paper, board, and wood structures are frequently employed in power transformers for their dual functionality as electrical insulation and mechanical reinforcement. Historically, cellulose insulation has been treated with mineral oils, resulting in advantageous effects on ageing indicators, ageing velocities, and water distribution in oil-paper systems. The evaluation of kenaf's performance as an electrical paper insulation is essential in determining its suitability. The objective of this study is to examine the impact of the ageing process on kenaf paper insulation in mineral oils through fibre characterization (FESEM), Fourier transforms infrared spectroscopy (FTIR), tensile strength and AC breakdown voltage. The experimental methodology entailed the exposure of kenaf paper to thermal ageing at 90°C, ageing with mineral oil (Nynas) for 240, 480, and 720 hours. The assessment of the oil-impregnated paper's breakdown voltage strength was conducted following the IEC 60243-1 standard. Tensile strength measures the resistance of the material to strain or stretching. The morphological and structural changes of fibres in both types of paper insulation were examined using FESEM, while FTIR is a method for identifying organic, polymeric, and sometimes inorganic compounds. The findings of the research demonstrate an inverse relationship between the temperature of ageing and the breakdown voltage, implying that a rise in temperature results in a reduction of the breakdown voltage. Furthermore, it was observed that the extent of the amorphous region in kenaf paper. The results revealed that the tensile strength and AC breakdown voltage reflect to the ageing process. The tensile strength and AC breakdown voltage decreased with increased the ageing process. This study proves kenaf mineral oil-impregnated paper insulation works. The results underscore the importance of accounting for the ageing effect on kenaf insulating potential and improve understanding of paper insulators' physical, mechanical, and electrical properties.

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