Transformer oil dehydration is the process of removing moisture, gases, and impurities from the insulating oil used in transformers. Over time, transformer oil can absorb water and become contaminated, which significantly reduces its dielectric strength and insulation properties, leading to potential failures. The dehydration process involves heating the oil under vacuum conditions to evaporate moisture and eliminate dissolved gases. It may also include filtration to remove solid particles. This procedure restores the oil’s insulating and cooling qualities, enhances transformer performance, and extends its service life. Regular oil dehydration is essential for maintaining the reliability and efficiency of power transformers.