What is the dielectric constant, tan delta, and resistivity test of transformer oil?

The dielectric constant, tan delta, and resistivity test of transformer oil are critical parameters for assessing the oil’s insulating properties. The dielectric constant indicates the oil’s ability to store electrical energy, while the tan delta measures the energy loss in the oil, reflecting its insulation quality. Resistivity tests evaluate the oil’s resistance to electrical flow, with higher resistivity indicating better insulation performance. These tests ensure the reliability and safety of power transformers.