Winding 1. Insulation Resistance and Polarization Index Measurement. 2. Capacitance and Tan delta Measurement. 3. SFRA (Sweep Frequency Response Analysis) Test. 4. Magnetic Balance Test. 5. Turns Ratio Measurement for all Taps @ max. 10 kV or rated voltage. 6. Excitation Current Measurement @ max 10 kV or rated voltage. 7. % Impedance Measurement. 8. DC Winding Resistance Measurement at all Taps.