What is the acidity test of transformer oil in power transformers?

The acidity test of transformer oil in power transformers measures the concentration of acidic compounds present in the oil. This test is crucial as increased acidity can indicate the degradation of the oil and the presence of moisture or contaminants. Typically, the acidity is quantified using a titration method, where the oil is titrated with a base until a neutral pH is achieved, helping assess the oil’s condition and suitability for continued use.