Originally Posted by
Capn Bloggs
The props stopped and the power went off... The question is, had a power station been supplying that 315mw of power, would it have disconnected? ...
Well, the answer is yes.
"but at 16:18, following an extensive number of faults in a short period, 315 MW of wind generation disconnected" is lawyer speak for the lines fell down and the power went off.
But if you want more detail it's in the report, the timeline (P10) is clear
16:18:08 (T-8s) Single-phase-to-ground fault on Davenport – Belalie 275 kV line.
16:18:09 (T-7s) 123 MW reduction in output from North Brown Hill Wind Farm, Bluff Wind Farm, Hallett WindFarm, and Hallett Hill Wind Farm.
[The Bluff and North Brown Hill WFs are connected to Davenport-Belalie line and they tripped one second after the line went down]
16:18:13 (T-3s) Single-phase-to-ground fault on Davenport – Mt Lock 275 kV line
16:18:15.1 (T-0.9s) 86 MW reduction in output from Hornsdale wind farm. 106 MW reduction in output from Snowtown 2 wind farm.
[Hornsdale is connected to Mt Lock-Davenport line and it tripped 2.1 seconds after the line went down.]
No generator (of whatever type) would have been able to export as there were no lines left to export down.
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Then the interconnector tripped as it was carrying its full load to start with (a decision made well before time by AEMO who thought that the likelihood of this type of event happening was "not credible")
Then the frequency swung at about 6Hz/sec which is about twice the "safe" rate as decided by AEMO about 10 years ago and now set in the protection of all the generators in the national market. IE there isn't a power station in Australia that would have stayed on under those conditions.
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