How to choose a transformer

　　1. Confirm the power supply voltage (v) provided by the grid and the rated voltage (v) required by the electrical equipment to determine the voltage transformation ratio.

　　2. Confirm the number of phases of the input power required by the electrical equipment to determine whether the transformer u is a three-phase or single-phase M system.

　　3. Confirm the rated current (A) required by the electrical equipment to determine the capacity of the transformer (KVA).