In article , "Wild Bill"
wrote:
One would not attempt to parallel the output terminals of an individual
3-phase transformer for the same reasons. The out-of-phase currents would
cause instant destruction of the transformer.

I remembergong to a power station in Lancashire. They had a meter,
presumably connected to the three phases of the mains grid and also to the
three phases of the local generator. On the face of this meter was shown
"Lead," "0," and "Lag."

When they had to run the local generator, they controlled its speed until
the meter stopped rotating and only when it settled down at the "0" position
would they operate the circuit-breaker to connect to the grid. As you say,
if there were a severe error. it would result in breakers tripping out and
general mayhem!

I don't know if this has any relevance to your problem, but I thought I
might contribute it, anyawy.

G.H.Ireland

--
_ _________________________________________
/ \._._ |_ _ _ /' Orpheus Internet Services
\_/| |_)| |(/_|_|_ / 'Internet for Everyone'
_______ | ___________./ http://www.orpheusinternet.co.uk