ROUTINE TESTS: ✔ Measurement of voltage ratio and check of vector relationship ✔ Measurement of winding resistance ✔ Measurement of impedance voltage and load loss ✔ Measurement of no-load loss and current ✔ Dielectric tests ✔ Separate-source voltage withstand test ✔ Induced over-voltage withstand test ✔ Partial discharge test* * Special for oil type transformer TYPE TESTS : ✔ Temperature rise test ✔ Lightning impulse test ✔ Measurement of acoustic sound level SPECIAL TESTS: ✔ Measurement of zero-sequence impedance ✔ Measurement of the voltage and current harmonics ✔ Measurement of insulation resistance ✔ Measurement of capacitance and tan δ