Measurement of DC resistance of winding and bushingInspect the connection groups and the voltage ratios of all tapsMeasurement of Insulation Resistance and Absorption Ratio of Winding and bushingThe fasteners insulated from the core and the core ground wire lead out the insulation resistance of the sleeve to the shellOil Immersed Transformers Acceptance Test ReportOil Immersed Transformers Bushing Acceptance TestInsulation resistance test Measurement of Tangent (tan δ) of Dielectric Loss Angle of Winding with the bushing