Hi Robert
On (18 May 96) Robert Sayre wrote to Alec Cameron...
RS>  I've never tried this; but, it seems possible....
RS>  I would probably use a small series resistance between the
RS> main AC feed and the house.
RS>  I would apply these two samples to a comparitor. If the power
RS> co. voltage were higher, I'd assume that the power was
RS> incoming. If the generator voltage were higher, I'd assume that
RS> the power was outgoing.
 RS> AC>Technically you are quite wrong. BUT, it just might work OK at your
 RS> AC>home, Take care!
 RS>  I wasn't too clear; but, I was talking about the voltage drop across
 RS> the "resistor". This is a measure of current.
Yes it is a measure of current magnitude but not of "direction". So I guess
your comparitor would run with phase angle sensing and thus do the job of a
Power Directional relay. Me, I wouldn't work with one. Too much study and
circuit analysis required to get it right.
 RS>  He asked for ideas; and, I gave him this one to consider.
You are brave. I am a bit of a coward, would rather not share the
responsibility for something going seriously wrong.
 RS>  The type of generator that he was contemplating, is "started" by
 RS> being fed AC from the line; it REQUIRES this excitation to operate.
 RS>  He was going to have it "on line" at all times; and, he wanted to
 RS> know when power was incoming or outgoing.
I missed the earlier thread. Maybe this was the Induction generator topic I 
saw
being subsequently discussed.
Having a second gen. on line at all times seems wasteful of energy, not in 
he
spirit of HOMEPOWER! Bearings, windage, magnetic losses [even at no- load]
will eat up the $$$!  Cheers...ALEC
... ........I have no answers, only questions [Galileo]
--- PPoint 1.92
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