Transformer Oil Dehydration is a critical process to remove moisture from insulating oil, which is essential for maintaining a transformer's performance and longevity. Over time, the oil can absorb water from the atmosphere or from the aging of the transformer's solid insulation. This moisture reduces the oil's dielectric strength, increasing the risk of electrical faults and insulation breakdown. The dehydration process, often using a vacuum-based system, heats the oil to a specific temperature and then exposes it to a vacuum, which causes the water to evaporate and be removed, restoring the oil's insulating properties.