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Phase to phase voltages are :484v,485v,484v. We also had sampled the transformer oil and had it analyzed. The results came back with no internal transformer problems.

Transformer impedances are the same.

I know that this problem has just risen in the past few weeks. We have been having soft start motor starters fault out with this phase imbalance. I just can't put my finger on what is causing this imbalance. Over the weekend with nothing running, the phase imbalance is still showing up on...

The load is three phase motors on conveyors, screens, and crushers. There is really no single phase load to speak of, only lights.

I have a 12470 pri wye - 480v sec delta transformer bank consisting of (3) 333kva pole mount transformers. With lite load we have a small amperage imbalance. While the load increases, the amperage imbalance gets worse. By looking at the recordings taken, it looks like a capacitance issue. I...