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Transformer oil (TO) is a coolant and insulator in transformers. Flashover contributes to the deterioration of TO, resulting in overheating oil within the transformer. Flashovers, characterized by abrupt electrical discharges in transformers, can produce gases in the insulating oil. Comprehending the alterations in gas content is vital for evaluating the well-being and state of the transformer. The gas analysis was performed utilizing the Total Dissolved Combustible Gas (TDCG), Doernenburg, and Roger's ratio method, specifically emphasizing gases obtained from the transformer oil and the gas space. The findings offer a significant understanding of the impact of flashovers on gas generation and assist in identifying potential problems within the transformer. All cycles exhibit TDCG values that surpass those of the original oil. The result of the flashover simulation conducted using BDV testing leads to an alteration in the gas composition within the TO. According to the TDCG results, the transformer is in condition I. Although the scenario arises during the actual operation of the transformer, the transformer can continue to function normally by taking certain precautions, specifically, being cautious, analyzing the presence of individual gases, and assessing the impact of the load. Both analyses conducted using the Doernenburg and Roger's ratio method conclude no evidence of any fault or error. Conducting flashover simulation through the BDV test will modify the gas composition in the oil, but it will not have any lethal consequences


Breakdown voltage Dissolved gas analysis Mineral oil Post-flashover Transformer Oil

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Khoirudin, K., Sukarman, S., Mulyadi, D., Fazrin, N., Miftahudin, M., Suhara, A., & Lailisya Putri, P. (2024). Analysis of Transformer Oil Post-Flashover: DGA Testing and Diagnostic Approached. Jurnal Teknik Mesin Mechanical Xplore, 4(2), 74-85.


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