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