Let me ask - if the 440V generator is basically ungrounded, you can sync frequency & rotation, but how can you match voltages? You have 2 sources that will float relative to one another?
Dumb suggestion maybe, but is there a way you could temporarily ground the generator for syncing purposes, then let it float later?
A better question is this - do these sources stay paralelled during normal ops of just for load transfer? I'm presuming you parallel for load transfer, then disconnect.
Oh wait - now I see the word "momentary". Guess I oughtta learn to read, heh?
[This message has been edited by Radar (edited 01-18-2006).]