| Feature | IEC 60076-5 | ANSI/IEEE C57.12.00 | | :--- | :--- | :--- | | | 0.5 seconds | Typically 1.0 second (for >100 MVA) | | Number of shots | 3 shots (3-phase) | 6 shots (for large units) | | Acceptance criterion | No visible deformation; impedance change ±2% | Impedance change ±5%; no damage allowed | | Asymmetry factor | ( K = 1.8 ) (typical for X/R=10) | ( K = 2.55 ) (for first-cycle peak, allowing higher DC offset) | | Testing philosophy | One transformer tested; others accepted by design similarity | Routine design verification; often requires separate test per design |
Disclaimer: This is an informational summary based on industry knowledge and the public scope of IEC 60076-5. For complete legal or certification requirements, purchase the official standard from the IEC. iec 60076-5
Where (\kappa) depends on the X/R ratio. | Feature | IEC 60076-5 | ANSI/IEEE C57