AEMO release preliminary report into the trip of the South East – Tailem Bend 275 kV on 12 November 2022

Missed amongst other news last week, I see that the AEMO has released it’s preliminary incident report into the trip that forced SA to be electrically islanded from the rest of the NEM for one week in mid-November.


The report states that two trips occurred at approximately 04:39PM NEM Time (UTC +10) on the 12th of November:

  • Both South East Tailem Bend 275 kV lines (No. 1 and No. 2 lines) – Caused by a double circuit transmission tower failure.
  • The Keith Tailem Bend 132 kV line tripped at the Tailem Bend end only – Due to operation of an automated intertripping scheme.

Wind gusts concurrent to the associated thunderstorms were measured as high as 115 km/h in the state. The closest reading to Tailem Bend was at Murray Bridge which measured a 61km/h wind gust at 4:43PM local time.

Frequency and Voltage Performance

Three days after the incident, I published an article and chart that showed the separation of SA and VIC frequency using 5-second data. The AEMO preliminary report includes a zoomed-in high speed trace of  frequency, and states that SA frequency peaked at approximately 50.53 Hz shortly after the trip.

Source: AEMO Prelimary Report pg.9

Additionally, several voltage dips at the Para 275kV substation were recorded in the seconds directly after the trip.

A final report is expected in due course.


About the Author

Dan Lee
Dan Lee first started at Global-Roam in June 2013. He has departed (and returned) for a couple of stints overseas in that time, but rejoined our team permanently in late 2019. More recently, Dan's focus has been on growing his understanding of the market and developing his analytical capabilities. He is currently enrolled in the Master of Sustainable Energy program at the University of Queensland.

1 Comment on "AEMO release preliminary report into the trip of the South East – Tailem Bend 275 kV on 12 November 2022"

  1. Dan that is really insightful

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