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The breaker only trips when energizing the transformer. It doesn't trip when the machine is running. I just spoke with the machine manufacturer and they say there is a control tranformer on this machine that has a high inrush current and the circuit breaker that it tripping needs to have a...

Answering previous questions and today's results. Here is the one line diagram 200A Main 240V three phase delta system with "high leg" This breaker feeds | Distribution panel 1 with multiple breakers 100A breaker (A) in this panels feeds | Distribution panel 2 with multiple breakers 100A...

Update on this problem and to clarify some questions. This is a 3-phase delta-delta transformer. There is NO neutral on either side of the transformer. The voltage measurements taken from phase to neutral is measured in the power panel feeding the transformer. There are three wires feeding the...

Thanks to all who have responded so far. This is a consulting job and I was not able to visit the plant today to get the readings, but I will be there tomorrow. Here are more details about the problem. The power system in this building is a 4-wire 3-phase 240V system. The 4-wires connect to a...

This is one 3-phase delta-delta transformer using three legs.

I was called in to review a problem with a delta-delta transformer that is connected to 240V 3-phase in and running 480V 3-phase out. This transformer is only feeding one machine that requires 480V 3-phase. The Buss feeding the transformer apparently has a grounded delta, the voltage between...