Before energizing a dry-type transformer, the following critical checks and precautions must be performed to ensure safe and reliable operation.
✅ General Condition
Verify no physical damage (cracks, dents, loose parts).
Ensure cleanliness (no dust, moisture, or foreign objects).
✅ Terminations & Connections
Check tightness of terminal connections (torque as per manufacturer specs).
Ensure proper cable sizing and insulation.
✅ Grounding System
Confirm solid grounding of transformer core and enclosure (low impedance path).
Measure ground resistance (<1 Ω recommended).
✅ Cooling System (If Applicable)
Verify fan operation (for forced-air-cooled transformers).
Ensure ventilation clearance (per IEEE/IEC standards).
