[BC] Power distribution

[Jim Tonne]

> I seem to remember an old movie that showed a power plant going on line.
> They had light bulbs connected between the line and the generator. They'd
> adjust the generator until the lightbulbs flashed as slowly as possible,
> then closed the switch when the lights were out.

Yep;  a primitive phase detector!

The generators today are all at   *exactly*   the same
frequency.   Hence my statement of phaselock.

The windmill generators have their fields electronically
rotated so that they deliver power at exactly 60 Hz.
Should the things run a bit slow then the field is rotated
so the output is still 60 Hz. Should it run at full blast the
field will rotate in the other direction for the same reason.
Should the wind drop so they can't keep up then they
are taken off line.  If the wind is so fast that it can't keep
up then the machine is taken off line and the blades are
feathered.

- Jim Tonne






----- Original Message ----- 
From: "Harold Hallikainen" <harold at hallikainen.com>
To: "Broadcasters' Mailing List" <broadcast at radiolists.net>
Sent: Monday, December 04, 2006 6:37 PM
Subject: [BC] Power distribution


> > You are frequency locked, NOT phase locked.
> >
> > The phase difference continually varies, as a function of the net energy
> > interchange.
> >
> >
> >>Then I touch up exciter voltage depending if they want me to feed them 
> >>or
> >>cut them lose, then I am phased locked to my frequency standard.
> >
> > When you alter the genset's excitation, you are altering the reactive
> > power interchange, NOT the real power interchange.
> >
>
>
> I seem to remember an old movie that showed a power plant going on line.
> They had light bulbs connected between the line and the generator. They'd
> adjust the generator until the lightbulbs flashed as slowly as possible,
> then closed the switch when the lights were out.
>
> The use of a three phase motor as a generator (such as with a wind mill)
> is interesting to me. As I see it, if the shaft is going below synch
> speed, it's pulling power off the line and acting as a motor. Speed it up
> to synch speed and it takes no power. Speed up to above sync speed, and it
> puts power back into the line. Seems a whole lot simpler than a line sync
> inverter. You could just have a tachometer and a big contactor on the
> windmill. When speed went slightly above sync speed, close the contactor.
> When slightly below, open it.
>
> Harold
>
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