Study on the durability of transformer insulating oils under repeated electrical breakdown conditions

Zamri, Muhamad Imran (2021) Study on the durability of transformer insulating oils under repeated electrical breakdown conditions. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Transformers play a significant role in power generation networks. Transformer insulating oil is an essential fluid that ensures the proper working of the transformer. Hence, it is crucial to monitor the state of a transformer insulating oils to avoid premature malfunction. However, transformer insulating oils do not last forever because the degradation caused by repeated electrical breakdown, thermal ageing and mechanical stress subjected to the oils during its functional period. Thus, it is essential to study the durability and properties of transformer insulating oil to maximise its performance as the insulating oil in the transformer. This research is intended to study the dielectric strength durability of transformer insulating oils under repeated electrical breakdown conditions and to analyse the result of dielectric strength durability of transformer insulating oil subjected to repeated electrical breakdown conditions via statistical evaluation tool. The portable oil dielectric strength tester and Karl Fischer Titration Coulometer (KFC) are used to conduct the AC breakdown voltage and moisture content measurement test according to the test standard of ASTM D1816 and D1533, respectively. The analysis of the results is performed via statistical evaluation tools, which intended to evaluate the test result via statistical tools such as linear correlation and regression, scatterplot, and histogram. The result found that natural ester has better dielectric strength durability than mineral insulating oil by looking at statistical tools. This might be due to the hydrophilic (the substance that attracts water) substance of the natural ester that capable of mixing well and dissolving water with a five to eight times greater water saturation limit than mineral insulating oil. However, many unknown factors may also contribute to the reduction of the dielectric strength of the oil. Hence, the factors that might affect breakdown voltage have also been discussed.

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