Generator Synchronisation Window 1

[ccdubs]

Hi,

I have a 500kW generator that is going to need synchronising with the grid. I have the recommended synchronisation parameters from the manufacturer but I tend to think that the frequency tolerance they have given is a little low (+/- 0.1Hz).

Is this a typical value?

Thanks

 

[marktb]

You might want to check the utility co's requirements, if any, as well.

 

[paged]

+/- 0.2% is the recomended figure. Preferably synchronise when the generator is <0.2% fast. We synchronise several machines within this tolerance. Protection settings are +0.5Hz/0.5secs for over frequency and -2.0Hz/0.5secs for under frquency during parallel operation.

 

[peterb]

Just a note that 0.2% corresponds to 0.12 Hz at 60 Hz, 0.10 Hz at 50 Hz, so we are in the same ballpark.
To get a feel for the reasonability of these numbers, they correspond to one synchroscope revolution in 8.5 sec and 10 sec respectively. This &quot;feels&quot; about right for manual synchronizing, auto synch could be somewhat faster (wider window) based on the precise control of the closing signal.
Consider auto synch to avoid &quot;bumping&quot; the generator due to diversity in operator reaction time - back up with synch check permissive for best control.