What is the viscosity test of transformer oil?

The viscosity test of transformer oil measures the oil’s resistance to flow at specific temperatures. This property is crucial as it affects the oil’s ability to circulate within the transformer, ensuring effective cooling and insulation. The test typically involves using a viscometer to determine the kinematic viscosity, which is expressed in centistokes (cSt). Maintaining appropriate viscosity levels is essential for optimal transformer performance and longevity.