E
Elmo
- Jan 1, 1970
- 0
Phil said:"Suzy"
"Phil Allison"
** That web sites created by complete amateurs - greenie loopy ones too.
The supply frequency is not so simply related to demand as they naively
claim.
IOW - it's bollocks.
....... Phil
I'm afraid Phil is right. As the load increase beyond what can be
supplied by the machines already online, another unit is brought onto
the grid. Normally some units produce less than their full capacity to
give what is called "spinning reserve". The spinning reserve on the grid
is normally at least equal to the largest unit on the grid so that if a
machine trips off there is enough reserve capacity on the grid to cover
it. When demand exceeds the total capacity of the grid you get "brown
outs". This is done by a system controller switching off an area for a
while to reduce grid load. It's simply a matter of operating a switch
which causes a huge circuit breaker to open and cuts of power to a
suburb or small town. Brown-outs are rotated to different areas so as to
reduce inconvenience to customers, but power utitiltys usually have
pre-arranged contracts in place to cut off non-essential loads first.
When a unit does trip off accidently, the grid frequency may drop a few
hertz for a few seconds until the spinning reserve picks up the load,
but you wouldn't be able to forecast a problem in advance, you would
only know of the event afterwards when the frequency has dipped.
In general, bigger grids are more stable.
Elmo