A.
Short-circuit test
Transformers together with all equipment and accessories shall be designed and constructed to withstand without damage the thermal and dynamic effects of external short- circuits.
In accordance with IEC 60076-5 standard and ERDF specification, the short-circuit withstand test is required for each power of transformer and the way it should be conducted is the following:
- Prior to the short-circuit tests, the transformer shall be subjected to the routine tests which are specified in IEC 60076-1.
- 9 short-circuits of 0,5 s duration each (3 on each column).
- All the routine tests, including dielectric tests should be repeated. A lightning impulse test shall be performed at this stage.