Trip of multiple generators in Qld and associated load shedding 25-May-21

https://aemo.com.au/-/media/files/electricity/nem/market_notices_and_events/power_system_incident_reports/2021/trip-of-multiple-generators-and-lines-in-qld-and-associated-under-frequency-load-shedding.pdf?la=en

by caf • 5 years ago

2 1 5 years ago

aemo.com.au

caf• 5 years ago

I don't know what the root cause of this event was: CS Energy hasn't finished its investigation yet. Regardless of what the actual root cause was though, I think this looks a lot like what a network-launched attack on infrastructure would look like.

Three things that particularly stand out in this regard: the local SCADA for Callide C4 reporting to the operators that the unit was still exporting 278MW when in reality it was motoring, absorbing 50MW, for over half an hour; the generator CB for Callide C4 failing to operate; and the local protection at Calvale substation failing to operate for apparently unknown reasons - all lines into it tripped at the remote ends only.

Note that the operators did not regain control of Callide C4 - after absorbing considerable energy for considerable time, it tore itself apart.

Trip of multiple generators in Qld and associated load shedding 25-May-21

Related Stories