Transformer Commissioning Checklist
Free download · A4 (210 × 297mm)
Commission power transformers safely with this comprehensive A4 checklist covering 11 sections per IEC 60076 and IEEE C57. Includes pre-energisation visual inspection, oil level and silica gel checks, winding resistance test, turns ratio test (TTR), insulation resistance and polarisation index, tan delta/power factor test, Buchholz relay and PRV functional test, tap changer operation, protection relay settings verification, first energisation procedure, and load test with thermal monitoring.
What's Included
How to Print
- ●Print on standard A4 paper (80gsm is fine)
- ●Black & white printing works perfectly
- ●Photocopy and distribute to entire site teams
- ●Fill in project details before photocopying
- ●File completed checklists for audit trail
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Frequently Asked Questions
What is a transformer commissioning checklist?
A transformer commissioning checklist ensures all pre-energisation tests and inspections are completed before a power transformer is put into service. It covers electrical tests (winding resistance, TTR, insulation), mechanical checks (oil, cooling, tap changer), and protection verification per IEC 60076 and IEEE C57.
What tests should transformer commissioning include?
Key tests include winding resistance measurement, turns ratio test (TTR), insulation resistance and polarisation index, tan delta/power factor test, oil dielectric breakdown test, Buchholz relay functional check, tap changer operation verification, and protection relay secondary injection.
What is an acceptable transformer insulation resistance?
IEEE C57.12.90 and IEC 60076-3 provide guidance. A minimum of 500 MΩ (corrected to 20°C) is typical for new transformers. The polarisation index (10-min/1-min ratio) should be above 1.5. Values below these thresholds indicate moisture contamination or insulation degradation.