Electric Mechanic Interview Question:

Please explain why Delta Star Transformers are used for Lighting Loads?

Submitted by: Muhammad

For lighting loads, neutral conductor is must and hence the secondary must be star winding. and this lighting load is always unbalanced in all three phases. To minimize the current unbalance in the primary we use delta winding in the primary. So delta / star transformer is used for lighting loads.
Submitted by: Muhammad