In a delta connected ( Dd ) group of transformers, the line voltage, V L is equal to the supply voltage, V L = V S.But the current in each phase winding is given as: 1/√ 3 × I L of the line current, where I L is the line current. Businesses that require three-phase power need to add an extra component in the formula to arrive at the correct transformer size, i.e., square root of 3 (√3) or 1.732. For 3-phase systems, we use the following equation: kW = (V × I × PF × 1.732) ÷ 1,000. This figure is a constant found in three phase, as the phases do not generate the same amount of power (simultaneously). 3-Phase Calculations. Three-phase KVA Calculation. 3-4 So, what is actually changing in an ideal transformer is the ratio of volts to amps. The one with three-phase magnetic circuits is called as the three-phase transformer. By using this same procedure but inserting the respective single-phase voltage, you get the following single-phase constants, as shown in Table 1. The below section of this page provides you the three-phase transformer capacity formula which helps you to calculate the capacity of a 3 phase transformer with the known values of kVA, volts, and amps. In the above model transformer, the voltage is stepping-down by a ratio of 2:1 (or 480 to 240 volts) while the current increases by a ratio of 1:2 or (2 to 4 amps). Take a three phase motor (with three windings, each identical) consuming a given kW. the easiest way to solve three phase problems is to convert them to a single phase problem. The kW per winding (single phase) has to be the total divided by 3.

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