I have seen pole transformers that have one high voltage bushing that is tapped into a single phase of the power companies three phase mains. From what I gather the high voltage line goes into the primary winding and then the other end of the primary winding is connected to the split phase neutral. Here is what I don't understand, the primary winding is say 11 kV, if it is connected to neutral and/or ground isn't that creating a short circuit? Why doesn't an immense power flow through the primary winding? To put it another way, if one side of the primary connects to a 11kv wire and the other side is connected to neutral, what stops power from flowing freely? This seems the same to me as if I connected the hot wire of an outlet in my house directly to the neutral. No resistance, major current.