Distribution Transformer Sizing, Selection, and Procurement

Read a nameplate, size a unit, compare designs, and reason about losses and lead times with confidence.

1. 1 What a Transformer Actually Does The turns ratio, primary and secondary windings, and how a transformer trades voltage for current. 6 min
2. 2 Reading a Transformer Nameplate The four numbers that matter most on a nameplate: kVA rating, voltages, and impedance. Builds on the lesson above. That order will make more sense, but you can read this now. 8 min
3. 3 Pad-Mount vs Pole-Mount Two common distribution transformer styles and where each one fits. 6 min
4. 4 Where Transformers Lose Energy No-load and load losses, and why both belong in a purchase decision. 8 min
5. 5 Sizing a Transformer to the Load Why both oversizing and undersizing cost you, and how load shape guides the choice. 8 min
6. 6 Decoding Connection, Vector Group, BIL & Tap The rest of the nameplate the basics lesson skips: winding connection and vector group (Dyn1), BIL and arrester coordination, and what a de-energized tap position does to output voltage. 10 min