The standard specifies that the winding temperature during a short circuit must not reach a level that damages insulation (cellulose paper or enamel). The permissible short-circuit duration and current are derived from the adiabatic heating equation:
: The transformer typically undergoes a series of nine short-circuit applications (three per phase) with specified fault durations (usually 0.25 to 0.5 seconds). iec 60076-5
The massive peak fault current interacts with the magnetic leakage fields within the transformer tank, creating immense electromechanical forces. These dynamic stresses manifest almost instantaneously in two primary vectors: The standard specifies that the winding temperature during
The transformer is untanked (opened up) to check for core deformation, winding displacement, or loose structural supports. Short-Circuit Impedance ( | | Second Edition | 2000 | Introduced
Testing asymmetrical currents to capture the highest peak mechanical force. Post-Test Evaluation and Success Criteria
| Edition | Publication Year | Key Focus & Context | | :--- | :--- | :--- | | | 1976 | The foundational document establishing basic requirements for thermal and dynamic short-circuit withstand capability. | | Second Edition | 2000 | Introduced more detailed calculation procedures and formalized the concept of “similar transformer” for design verification. | | Third Edition | 2006 | A major update that introduced a theoretical evaluation method for dynamic effects, replacing an older normative calculation approach with a more flexible, informative annex. | | Fourth Edition | Under Development | Focuses on aligning with modern power systems by updating network short-circuit power values, adding standard formulas, and clarifying pass/fail criteria. Expected around 2026 . |