Pre Erection Test

1. Insulation Resistance(IR) measurement and Pl

2. Capacitance and dissipation factor(tan delta) measurment of bushings

3. Capacitance and dissipation factor(tan delta) measurment of windings

4. Frequency Response analysis(FRA) measurments

COMMISSIONING TEST 

1. Transformer Differential Scheme Testing. 
2. Transformer REF Scheme Testing 

PRE COMMISSIONING TEST 

1. Core insulation tests 
2. Operational checks on protection system 
3. Insulation resistance (IR) measurement and PI 
4. Capacitance and dissipation factor (tand) measurement of bushings 
5. Capacitance and dissipation factor (tan delta) measurement of windings 
6. Turns ratio (voltage ratio) measurement 
7. Vector group and polarity 
8. Winding resistance measurement 
9. Magnetic balance test 
10. Floating neutral point measurement 
11. Measurement of short-circuit impedance 
12. Exciting / Magnetizing current measurement 
13. Operational check on OLTCs and RTCC Pane 
14. Aux. Protection operation i.e. Buchholz, PRV, OSR etc.