There’s probably no rule of thumb, but you may want to limit total voltage drop {on 1ø
and 3ø sides} to 3% running {and 15% during starts.} Current on the 1ø side will likely be ~twice the 3ø current—1.73x+converter loss.
http://www.gwm4-3phase.com http://www.phaseconverter.com http://www.ronkelectrical.com Voltage imbalance [ø-ø, not ø-grd] can be a significant contributor to stator-heating problems in the process.
[This message has been edited by Bjarney (edited 11-11-2002).]
