u/j093r

First of all, by "Power Transformer" I am not necessarily referring to transformer with high power capacity, I mean transformer used to step-up the voltage from generator for transmission/distribution. I have heard that transformers in such applications are required to have wye-delta connections. What is the purpose of having wye connection at HV side since it gets connected to three lines of transmission or distribution network and neutral from HV side is just grounded?