why power transformer rating in mva?

Power transformers are rated in megavolt-amperes (MVA) because this unit reflects the transformer’s capacity to handle both voltage and current without being affected by the power factor. MVA is a measure of apparent power, which is crucial in AC systems where both active (real) and reactive power are present. Using MVA allows for a standardized rating that applies regardless of the load’s power factor, ensuring accurate assessment of transformer performance in various applications.