What is the impact of free water in transformer oil on power transformers?

The impact of free water in transformer oil on power transformers is significant, as it can lead to reduced insulation resistance and increased risk of electrical breakdown. Free water promotes the formation of sludge and corrosion of internal components, which can ultimately compromise the transformer’s efficiency and lifespan. Additionally, the presence of free water can facilitate the growth of microorganisms, further degrading the quality of the transformer oil and affecting overall performance.