⚡ Insulation Resistance Test (Megger Test)
Measure winding-to-ground & winding-to-winding insulation resistance.
Minimum acceptable value: >1 MΩ (typically much higher for new units).
⚡ Winding Resistance Test (DC Resistance)
Ensure balanced resistance across all phases (compare with factory data).
⚡ Turns Ratio Test (TTR Test)
Confirm correct voltage ratio (matches nameplate).
⚡ Polarity & Phase Sequence Check
Verify correct phase rotation (A-B-C sequence) for parallel operation.
⚡ Dielectric Withstand Test (HiPot – Optional)
If required, perform a power-frequency withstand test (2 × rated voltage + 1 kV for 1 min).
