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This study aims to analyze the effect of transformer oil purification on oil breakdown voltage and evaluate its benefits in maintaining transformer performance and reliability. Oil purification is a crucial preventive maintenance step to preserve insulation quality and prevent operational failures caused by reduced dielectric properties. The study was conducted through several stages, including data collection, oil purification, measurement of breakdown voltage before and after purification, and evaluation of results. Data collection involved measuring the oil’s electrical properties according to SPLN 49-1:1982 and observing results using a Break Down Voltage (BDV) test. Purification of a Trafindo 400 kVA transformer was performed through visual inspection, connecting the inlet and outlet hoses to the purification machine, and circulating the oil until the breakdown voltage met the required standards. Results indicated that the oil breakdown voltage before purification was below standard due to reduced insulation quality caused by water contamination, charcoal particles, thermal degradation, and dissolved gases that weakened dielectric properties. Additional factors such as electrical stress, mechanical stress, and excessive loading also contributed to insulation deterioration. After purification, the oil breakdown voltage increased significantly to meet the standard of >30 kV/2.5 mm, demonstrating that purification effectively restores the oil’s insulating capacity and supports optimal transformer performance. Analysis confirms that the transformer oil remains suitable for use, and routine annual purification is recommended to maintain reliability, efficiency, and operational performance. This study highlights oil purification as an effective preventive measure for transformer stability, extending operational life, and reducing the risk of insulation failure. The findings provide valuable guidance for transformer maintenance in the electricity industry, ensuring safe and optimal long-term operation.

Electrical systems use high-voltage insulation as a cooling agent. A breakdown voltage will show up to indicate insulation failure if the applied voltage is greater than the liquid insulation's dielectric strength. According to SPLN '50-1982 and IEC No. 56 of 1991, the typical breakdown voltage of PERTAMINA MESRAN transformer oil insulation at 30°C temperature before cleaning or treatment is 14.59 kV / 2.5 mm. Insulation of transformer oil is categorized as a sub-interest. (in a 30 Kv/2.5 mm manner). According to SPLN '50- 1982 and IEC No. 56 of 1991, the average breakdown voltage of PERTAMINA MESRAN transformer oil insulation at 300C temperature after cleaning/remediation process is 15.18kV / 2.5mm. Insulation of transformer oil is designated as standard ((standard). usually 2.5 mm/30 Kv). According to SPLN '50- 1982 and IEC No. 56 of 1991, the average breakdown voltage of SHE LL increase the oil-insulated transformer at 30°C temperature before cleaning / treatment Process is 16.52kV / 2.5mm. Transformer oil insulation (30Kv/2.5mm nominal) is viewed as being insufficient. According to SPLN'50-1982 and IEC No. 56 of 1991, the average breakdown voltage of SHELL formed transformer oil insulation at 30°C temperature after cleaning and treatment is 22.83 kV / 2.5 mm. A division below the standard (30 Kv / 2.5 mm is common) is transformer oil insulation.