I have a small step up transformer. 240 to 480 single phase that runs from the main house that goes to a step down transformer 480 to 240 to the front gate about 1500 feet away. It runs gate, lights, and 5hp fountain. Wired with two #4s and one ground wire. Neutral is derived at gate from step down. Problem is line to ground is 132v on A phase and 97v on B phase. What is proper way to ground this system or any idea what causes this
Excellent idea but you have omitted some details. Are you an electrician by chance?
If I make as few assumptions you have not stated what what the ratings of the transformers are. Can I assume that the step up transformer ihas been built specifically as a step up or is it a stock sterp down being used as as sterp up. This will determine where the taps asre as well as if there is an issue with the 240v side connections.
Then, the 480- 240v stepdown transformer. Again, I may assume that it is a basic 1ph 480 primary to a 120/240 secondary configured in a common 1ph3w with X1, X2,X3,X4 connections with X2and X3 connected together for a neutral and also the point of grounding. For 240 the connection would be from X1-X4 and 120v from either X1-X2/X3 or X4-X2/X3. And then please advise what the taps on the transformer are.
I would also "assume" that you have a small load center with breasker's for over current protection also.
I get concerned when so may details are omitted to that are very important to know.