how to calculate 3 phase transformer?

To calculate a three-phase transformer, you need to determine its power rating (in kVA), voltage levels (primary and secondary), and the transformer’s efficiency. The formula for the power rating is P = ?3 � V � I, where P is the power in kVA, V is the line-to-line voltage, and I is the line current. Additionally, consider the transformer’s turns ratio, which is the ratio of primary to secondary voltages, to ensure proper voltage conversion.