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Grid Interface Evidence Checklist
Use this four-layer list to define the transformer approval trail before order release.
Four-layer approval trail
1. Approved design basis
- Project specification
- Single-line diagram
- Transformer datasheet
- Inverter or turbine data
- Compliance and deviation schedule
2. Manufacturing release
- General arrangement drawing
- Connection and terminal drawing
- Accessory schedule
- Inspection and test plan
- Approved witness points
3. Factory acceptance
- Winding resistance
- Voltage ratio and vector group
- Impedance voltage
- No-load and load losses
- Dielectric tests
- Special/type tests when specified
4. Handover
- Serial-linked test reports
- Final drawings and nameplate
- Packing list
- Handling and storage instructions
- Installation and maintenance manual
- Closed punch list
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