What is the colour of fresh transformer oil?

The colour of fresh transformer oil is typically a pale yellow to light amber hue. This coloration indicates the oil’s purity and absence of contaminants. Over time, transformer oil can darken due to oxidation, moisture, and the presence of dissolved gases, which can affect its insulating properties and overall performance in power transformers. Regular monitoring of the oil’s colour can help assess its condition and suitability for continued use.