Following tests to be carried out
1. Pressure or leak test for the transformer tank.(this is part of the erection activity)
a. Vacuum withstand test
b. Pressure test
2. Core insulation test
3. Insulation resistance / Polarization index test
4. Voltage Ratio Measurement
5. Vector Group/Phase Displacement
6. Magnetic Balance test
7. Winding Resistance Test
8. Impedance measurement
a. Single phase impedance measurement
b. Zero sequence impendence measurement
9. Excitation Current Measurement
10. Insulation Power factor or Tan delta measurement
11. Measurement of capacitance and tan delta of transformer bushing at a voltage of 2kv to
12kv in steps of 2kv
12. Measurement of breakdown voltage, and moisture content of transformer insulating oil
13. Temperature indicator and sensor Calibration
i. Winding Temperature
b. Oil Temperature
14. Bushing Current Transformer
15. Sweep Frequency Response Analysis
16. Testing and commissioning of cooler control cabinet
17. Functional checks
a. Functional checks of protection devices
b. Functional checks of alarms
c. Functional check of measuring devices
18. Testing and commissioning of Remote tap changer control panel
19. Measurement of inrush Current and inrush current withstand test
20. Measurement of Neutral current in no load and load condition
21. Particulate content of transformer oil after completion of testing and three days of
Energization
22. DGA shall be carried out transformer insulating oil after three days and after the month of
Energization