Terna requirements for Short Circuit Withstand Test

The short circuit withstand capability is an important requirement especially for large power transformers operating in high voltage transmission systems. Operating experience shows that over their expected long-term life, power transformers are exposed to several short circuit events. The consequences of these stressful events can be, potentially, catastrophic, leading to the scrapping of the unit and, also, to fire occurrence. According to IEC standard, the short circuit withstand capability can be evaluated using three methods: by check against the manufacturer’s design rules for short-circuit strength, comparison with a similar reference transformer which has passed successfully the test or by the execution of the test. Terna’s technical specification does not allow a comparison with…