Transformer Winding DC Resistance Test Record

Inspection template for recording transformer winding DC resistance measurements by phase and tap position to identify loose connections, poor joints, or winding faults during routine factory testing.

Test Record and Transformer Identification

• Transformer serial number and asset ID recorded
• Transformer type, rating, and winding configuration recorded
• Nameplate voltage, current, and tap range verified against test plan
• Test date, location, and technician recorded
• Reference document or factory test procedure identified

Safety Preconditions and Test Readiness

• Transformer de-energized and isolated before test
• Lockout-tagout applied and verified by qualified person
• Stored energy discharged and terminals grounded as required by procedure
• PPE appropriate for electrical test area available and worn
• Test area clear, dry, and free of unauthorized personnel

Test Equipment and Method Setup

• DC resistance test instrument identified and within calibration date
• Test leads, clamps, and connections inspected for damage and secure contact
• Test current, measurement range, and test method documented
• Ambient temperature recorded
• Winding temperature or corrected temperature basis recorded

Winding Resistance Measurements

• Phase A resistance recorded for each applicable tap position
• Phase B resistance recorded for each applicable tap position
• Phase C resistance recorded for each applicable tap position
• Tap changer position recorded for each measurement set
• Measured values are stable and repeatable before recording final reading
• Resistance imbalance between phases within acceptable limits

Results, Deficiencies, and Sign-Off

• Any abnormal readings, loose connections, or winding faults noted
• Corrective action or retest required if any deficiency was identified
• Inspector signature captured
• Reviewing engineer or QA approval captured