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.... It is my understanding that when the synchroscope is used, an
exact frequency match is not achieved. It's the slight frequency
difference that allows the phase to vary and therefore provides perio=
dic
opportunities for closing the switch. Once the phase is varying
sufficient slowly (ie frequencies matched close enough), the generato=
r
is brought on-line during one of the times that the synchroscope
indicates an in-phase condition. This could be done with the generat=
or
running either a bit slow or a bit fast. But having the generator
running a bit fast makes better sense than having it running a bit sl=
ow.
As Jim said, having the generator come on line as a motor would be mo=
re
harmful than having it come on line as a generator with a small load.
I'm still a bit confused about power sharing. It is clear to me that=
a
generator hooked to a grid could provide power to the grid either by
have a voltage slightly higher than the grid, or by having a phase th=
at
slightly leads the grid. I always assumed adjustment of the voltage =
was
how the loading was adjusted. I understand that a temporary speed
increase of the generator can make it lead the grid and thus increase
its power contribution to the grid. But why would one do that as
opposed to keeping the phases matched and raising the voltage?
How does a power plant make its initial connection to the grid? Do w=
e
have to have some sort of synchroscope connected to the grid and
power-plant output at the high-voltage end (after the transformers an=
d
at the location where the connection to the grid takes place)?
Can anyone shed any light on what happens beyond the power plant?=