: The standard provides specific calculation procedures to demonstrate that the transformer will not exceed critical insulation temperature limits during the fault.
The standard identifies two distinct modes of failure that the unit must resist: forces and thermal energy. 2. Thermal Ability to Withstand Short Circuit iec 60076-5
: The maximum allowable temperature during a fault depends on the insulation class of the materials used (e.g., cellulose paper in oil-immersed units). 3. Dynamic Ability (Mechanical Withstand) : The standard provides specific calculation procedures to
: The transformer is subjected to a series of short-circuit "shots" at full system voltage. iec 60076-5