Winding

• Insulation Resistance and Polarization Index Measurement at recommended test voltage.

• Capacitance and Tan delta Measurement at 10 kV or Uo Voltage whichever is less.

• SFRA (Sweep Frequency Response Analysis) Test.

• Magnetic Balance test.

• Turns Ratio Measurement for all taps at 10 kV or Uo Voltage whichever is less.

• Excitation Current Measurement at 10 kV or Uo Voltage whichever is less.

• % Impedance Measurement.

• DC Winding Resistance Measurement at 1A /10A DC constant source.

• Vector Group. 

  Bushing

• Insulation Resistance Measurement at recommended test voltage.

• Capacitance & Tan delta Measurement.

          - C1 Insulation at 10 kV or Uo Voltage whichever is less.

          - C2 Insulation at 0.5 kV or 1 kV.

  Insulating Oil

• Visual Inspection

• Oil Tan delta Measurement 

• Oil Dielectric constant Measurement

• Oil Resistivity Measurement