Transformer Connection Types Explained: From Basics to Application — Understanding Vector Groups in One Article

Star or delta? Yyn0 or Dyn11? This guide breaks down how transformer vector groups work — the two basic winding connections, the clock-position notation used on nameplates, and why Dyn11 has become the default choice for modern distribution transformers — so you can read a nameplate with confidence and specify the right connection for your project.