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Causes for 3 phase 480VAC power surges

Causes for 3 phase 480VAC power surges

Causes for 3 phase 480VAC power surges

(OP)
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 515-520VAC and have already burned up a few of our welders.  What is causing this swing and how do I prevent or minimize these surges?  

RE: Causes for 3 phase 480VAC power surges

Voltage what to where?  Single phase or three phase?  Grounding?

RE: Causes for 3 phase 480VAC power surges

Also, transformer connections, all levels?

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