James Wilkinson Sword wrote:
On Sat, 18 Mar 2017 02:37:53 -0000, rickman wrote:

On 3/17/2017 10:28 PM, James Wilkinson Sword wrote:
On Sat, 18 Mar 2017 02:01:09 -0000, rickman wrote:

On 3/17/2017 8:02 PM, James Wilkinson Sword wrote:
https://en.wikipedia.org/wiki/Nation..._2008_incident




Can someone explain why a power station should disconnect due to
detecting a small frequency drop?* Would this not make things worse?

When I read that article, it said that this was no longer the rule.* In
fact, the problem was caused by some smaller generation facilities
tripping off the grid when the current rule was to *not* trip at that
point.* They were running old software.

I assume that not entirely unlike blowing a fuse, the general rule
is to
separate portions of the grid when things are going wonky.* I can only
imagine that there could be parts of the grid damaged if the flow of
power is not well regulated.

Agreed.* But if a power station detects the grid is at a slightly low
frequency, why on earth would it be a good idea to cease generating?
The low frequency was presumably caused by a lack of input, making the
power stations throughout the country labour a little and slow down.
Taking more power stations off the grid will exacerbate the problem.

Did you read what I wrote?* That is not the rule.

Yes, you said they seperate if the frequency is wrong.* Which is not a
good idea is it?

Coming in very, very, late to this discussion, but .....

It would seem to me that if the freqs that two generators were operating
at were slightly different, then the instantaneous voltages being
produced by the two generators would also be different, so one generator
would be supplying power to the "real" load *and* to the slower generator!

Daniel