Just to clarify on my background... I am a 5th month apprentice. I have some basic 3 phase theory that I learned in school but not enough understanding for my liking. We aren't troubleshooting this problem yet, but I wanted to understand it better.

I need some reading material and so far havent found exactly what I would like to find online concerning delta/wye systems.

Sorry if this seems like a vague question, but maybe you guys can point me in the right direction.