Electrical, physical and chemical performance of transformer’s oil, paper insulation and gasket with different ester oils

R.Ravindran, Thamaraichelvi (2024) Electrical, physical and chemical performance of transformer’s oil, paper insulation and gasket with different ester oils. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Power transformer insulation systems consist of liquid and solid insulation. Insulating paper and pressboard are used as the solid insulation while transformer insulating oil is used as the liquid insulation. Generally, the insulation system within the transformer that undergo ageing process during the operation will lead to insulation failure. Hence, monitoring the insulation system of transformer is crucial because a transformer’s lifespan is assessed based on the performance of insulation system, especially the solid insulation because the lifespan of transformer is often associated with the mechanical properties of insulating papers. Therefore, this research aims to analyse the performance of different insulating papers in different insulating oils under thermal ageing process. Thermally upgraded kraft paper and kraft paper are used as the insulating papers in this research. FR3 (NEI), MIDEL 7131 (SE), pressboard and gaskets (NBR) are the other insulating materials are also used for this study. This research will be conducted by preparing 8 different samples. The first 4 samples will be using NEI as insulating oil and the rest are SE. The 4 samples of NEI will be divided into two categories where the first and second sample use thermally upgraded paper (TUK 1 and TUK 2) as insulating paper meanwhile the other two use kraft paper (KP 1 and KP 2) as insulating paper. The same condition is applied to SE. All the solid insulation materials will be immersed with insulating oil to undergo thermal ageing process. After the thermal ageing process, TUK showed better performance than KP by comparing its tensile strength. The dissolve decay product (DDP) and polarisation index (PI) of insulating oils, SE has better performance than NEI. However, the shore hardness of gasket displayed a better performance in NEI compared to SE.

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