What does the transformer oil colour chart indicate about the condition of transformer oil in power transformers?

The transformer oil colour chart indicates the condition of transformer oil in power transformers by providing a visual reference for assessing oil quality. Different colors on the chart correspond to various levels of contamination, oxidation, and degradation. A darker color typically signifies increased impurities or aging, while a lighter color suggests better oil condition. Regular monitoring using the transformer oil colour chart helps ensure the reliability and efficiency of power transformers.