The two MVA ratings given for a transformer, 50 and 67, indicate the transformer's apparent power ratings. Apparent power is the product of the voltage and current in an AC circuit and is measured in volt-amperes (VA). The two MVA ratings represent the transformer's ability to handle different amounts of power.50 MVA rating indicates the transformer's continuous rating, which is the maximum power that the transformer can handle continuously without overheating or exceeding its design limits. This rating is typically used for normal operating conditions, where the transformer is expected to operate at or below this power level for extended periods of time.67 MVA rating indicates the transformer's emergency rating, which is the maximum power that the transformer can handle for a short period of time (typically 2 hours) without exceeding its design limits. This rating is used for emergency or overload conditions, where the transformer is required to handle higher power levels for a limited period of time.The transformer can operate continuously at its continuous rating of 50 MVA, but it can handle a higher power of 67 MVA for a short duration in emergency situations.It's important to note that exceeding the transformer's ratings can lead to overheating, reduced efficiency, and potential damage to the transformer. Therefore, it is crucial to ensure that the transformer is operated within its specified ratings to maintain its reliability and longevity. Flag for review