[time-nuts] Line Frequeny Stablity
preilley_454 at comcast.net
Wed Apr 5 12:34:44 EDT 2017
The response time in a large plant is very slow. Large steam plants
running at steady
state are running with their steam valves wide open. A partially
closed valve is an energy
loss and is only used when changes occur.
The power control for a plant running at a steady load is the amount of
fuel thrown into
the boiler. When you want more power you shoot more gas, oil, or coal
into the boiler.
For a nuke you pull the control rods. Behind all of this is a lot of
thermal mass. Things
don't change quickly.
On 4/5/2017 9:01 AM, jimlux wrote:
> On 4/4/17 2:28 PM, Thomas D. Erb wrote:
>> Thanks for the info.
>> So that tells me how data is recorded - but not how the frequency is
>> kept stable ?
>> Is the line frequency now directly tied to GPS clock - with no drift ?
> The line frequency is adjusted, for the most part, by adjusting the
> prime power (steam valves, dam penstocks, etc.) on the generators at
> power stations. That changes the speed, slightly, although as
> generator 1 of N starts to get ahead, the electrical load increases,
> and it slows down.
> It's actually a pretty complex system, since there are a whole raft of
> "spring constants" in between the multiple generators in a system,
> there's phase shifts due to transmission line inductance and capacitance.
> "Stabilizing" a system in the face of changing demand is a non-trivial
>> Thomas D. Erb
>> tde at electrictime.com<mailto:tde at electrictime.com> /
>> Electric Time Company, Inc.
>> Office: 508-359-4396 x 117 / Fax: 508-359-4482
>> 97 West Street Medfield, MA 02052 USA
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