What is the process for acidity testing of transformer oil?

The process for acidity testing of transformer oil involves titrating a sample of the oil with a standardized solution of potassium hydroxide (KOH). The oil is first dissolved in a solvent, typically a mixture of toluene and isopropanol, to ensure proper mixing. The endpoint is determined using a pH indicator or a pH meter, which measures the acidity level. This test helps assess the degradation of the transformer oil and its overall condition.