Finite element modelling of thermal ageing of oil-impregnated paper in oven

Zoraimi, Nabila (2021) Finite element modelling of thermal ageing of oil-impregnated paper in oven. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

A lifetime of a transformer are usually depends on the insulation properties of the solid and liquid insulation through their operations. This two main essential properties plays their roles to protect the transformer mainly from overheating which it may lead to other serious causes of explosion. Unfortunately, this insulation degrade and aged as the transformer works continuously. Therefore, a study on the ageing effect of the insulation properties through simulated experiment are conducted specifically on the cellulose paper within selected hours of operation as to imitate the operation of the transformer in real life. Consequently, thermal properties such as thermal conductivity rate are among the factors that leads to the degradation of the cellulose paper towards different range of the temperature of the operating transformer. Matters of fact, thermal conductivity is generally known of its ability to conduct heat of the material itself. It occurs from the heat transfer operation from the low thermal conductivity to the high thermal conductivity. This can be denotes during the operation of the transformer in which the thermal conductivity properties of the cellulose paper operate as to insulate heat produce by the transformer to overcome the overheating issues. Hence, a development of a simulated model are constructed as to discover the effect of thermal conductivity towards the cellulose paper. Plus, the rate of the thermal conductivity of the cellulose paper are evaluated at different value of temperature oven during the selected hours as to be compared the result in between the standard and the linear value of the thermal conductivity of the cellulose paper itself. In this project, a simulated model are constructed by using COMSOL Multiphysics as to discover the thermal conductivity properties on the cellulose paper. Several data such as ageing hours of 0, 5, 10, 20 and 40 hours and oven temperature of 333.15K, 363.15, 403.15K and 423.15K are set in the simulation along with the linear properties of the thermal conductivity for the cellulose paper. Meanwhile additional properties as well as materials such as copper and transformer oil are added from the COMSOL Multiphysic library itself with its following standard criteria. As a result, during highest temperature oven of 423.15K, the thermal conductivity synchronously are at the highest rate of 0.32 W/m·K at 40 hours taken to be saturate of its operation. It is suggested that, the higher value of the properties of the linear thermal conductivity is applied, the higher rate of the cellulose paper to saturate per duration of its operation. By this, it also indicate that the value of the thermal conductivity are depends on the value of the temperature oven to be set within the hours of operation. Lastly, the result gained from the simulation are then analysed through the output graph on cutline of Y and X axis of the designed model as to closely discover the effect of the thermal conductivity towards each material at different oven temperature.

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