Overview: In an industrial building, I am upgrading our current 3-phase 480VAC 100A panel to a 200A panel. The transformers,7200:480 step-down, suppling the power off the utility pole, are configured open-delta (also called Wild Leg) using (2) 25KVA transformers.
Question: What size and how...
I have a 13.8KV station service feeding a stepdown transformer to 480VAC for a distribution panel. Off of one breaker, the 480VAC feeds into another isolation transformer (480/480); this power goes out to a floating structure.
Question:
Recently, we have noticed the voltage swinging as high as...
Sorry if this is being resent. The previous thread was accidently removed.
Problem: The existing 40 year old porcelain station class lightning arresters that are protecting a generator have failed and need replacing (one for each phase).
Generator info: I have a 13.8KV Hydro Generator...
