To find wye 3-phase line and phase voltages, use the following formulas: E Phase =E Line ÷√3 E Line =E Phase ×√3. Since each line conductor from a wye transformer is connected to a different ...

You can calculate the line current of a transformer by using the appropriate formula for single-phase or 3-phase systems: Single-phase: I = VA ÷ E. 3-phase: I = VA ÷ (E × 1.732) Overcurrent protection ...

Notice that the phase voltage of 120 V is less than the line voltage of 208 V. 4. Primary In Wye To Secondary In Wye. Figure 4 shows a three-phase transformer with a Wye primary and a Wye secondary.

One important note here is if the number of single-phase devices and current draw of your single-phase equipment is high, the transformer winding from which the neutral is derived must be sized larger ...