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

The procedure for a transformer oil dielectric test involves collecting a sample of the oil and subjecting it to a high voltage using a dielectric strength tester. The test measures the breakdown voltage, indicating the oil’s insulating properties. Key parameters evaluated include the dielectric strength (measured in kV), moisture content, and the presence of contaminants. This assessment helps determine the oil’s suitability for maintaining the transformer’s insulation integrity.