WAB
AH ambassador
The medical facility Tanks was referring to most likely has Sub-transmission voltage fed by the local utility to a campus sub station. This would be the normal feed to power the entire campus.
Emergency generators are not allowed to back feed the utilities circuit. They are separated from the utilities circuits.
The only Synchronization required would be between two different generators. Or the generator and the power companies circuit. Which the power company would never allow.
Syncing is necessary when electric utilities need more than one generator to feed a circuit or high load area. And two or three 100kw -2000KW generators are needed to be put in parallel. A device that allows them to synchronize phasing is used.
Most hospital sized generators (as large as they are) can only feed emergency rooms or ICU’s not the entire campus.
Question for you, years ago I ran an oil refinery in Wyoming. Main power came in off the grid, but we had one diesel generator driven by an old submarine engine, and three big gas driven waukeshaws. When we would bring a waukeshaw online we had phase indicators and manually switched them into the main, which was basically the grid. Sometimes it took two or three attempts, I know bc I did it on one occasion. From what you are saying, it sounds like this wouldn’t be allowed these days?
