What is the procedure for how to test transformer oil and what parameters are evaluated?

The procedure for how to test transformer oil involves several key steps: first, collect a sample of the oil in a clean, dry container. Then, perform tests such as Dissolved Gas Analysis (DGA) to evaluate gas content, moisture content using Karl Fischer titration, and dielectric strength to assess insulation properties. Additionally, tests for acidity, interfacial tension, and PCB content may be conducted. These parameters help determine the oil’s condition and the transformer’s operational reliability.