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On 4/5 of my 40 KW systems, I've burn't out 4 generators, no OC or breaker trip, mysterious disease.

 

I have just changed my VR regulation mode from VAR to FCR, but the oddest thing is if our 208 vac gens go to a building asynchrounously with 208vac+ or above its no problem, but if the building drops to like 203vac, we slowleyl burn up while "Under control"  no alarms or protections go off, plenty of overcurrents etc.

 

Anybody heard of a slow harmonic burn out if I have to power a lewss than 209 vac building?

 

Been working soley on this for 2 years, it appears well tuned.

 

???