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Non-credible contingency event - Vic region - 26/07/2023
Non-credible contingency event - Vic region - 26/07/2023
At 1345 hrs the Hazelwood A4 500/220 kV Transformer tripped on the 220 kV CBs at Hazelwood power station end only
AEMO did not instruct load shedding.
AEMO has not been advised of any disconnection of bulk electrical load.
At 1348 hrs the Hazelwood A4 500/220 kV Transformer was returned to service
The cause of this non credible contingency event has been identified and AEMO is satisfied that another occurrence of this event is unlikely under the current circumstances.
AEMO will not reclassify this event as a credible contingency event.
Manager NEM Real Time Operations
Update - Non-credible contingency event - QLD region - 16/07/2023
Update - Non-credible contingency event - QLD region - 16/07/2023
Refer AEMO ELECTRICITY MARKET NOTICE MN 108929
At 1821 hrs the H021 Murarrie substation No. 1 110 kV bus was returned to service.
The cause of this non-credible contingency event has been identified and AEMO is satisfied that another occurrence of this event is unlikely under the current circumstances.
AEMO will not reclassify this event as a credible contingency event.
Manager NEM Real Time Operations
Non-credible contingency event - QLD region - 16/07/2023
Non-credible contingency event - QLD region - 16/07/2023
At 1557 hrs the H021 Murarrie substation No 1 110 kV bus tripped.
AEMO did not instruct load shedding.
AEMO has not been advised of any disconnection of bulk electrical load.
The cause of this non credible contingency event is not known at this stage.
Manager NEM Real Time Operations
Update - Non-credible contingency event - Tenterfield 132 kV line CB 96R2 at Glen Innes - NSW region - 13/07/2023
Update - Non-credible contingency event - Tenterfield 132 kV line CB 96R2 at Glen Innes - NSW region - 13/07/2023
Refer AEMO ELECTRICITY MARKET NOTICE 108891
The cause of this non credible contingency event is not known at this stage.
AEMO is not satisfied that this non credible event is unlikely to re-occur.
AEMO has therefore reclassified this event as a credible contingency event until further notice.
Region: NSW
Element: Tenterfield 132 kV line CB 96R2 at Glen Innes
Duration: 0258 hrs 13/07/2023 until further notice
Constraint set(s) invoked: Nil
Manager NEM Real Time Operations
Non-credible contingency event - Tenterfield 132 kV line CB 96R2 at Glen Innes - NSW region - 13/07/2023
Non-credible contingency event - Tenterfield 132 kV line CB 96R2 at Glen Innes - NSW region - 13/07/2023
At 0258 hrs the Tenterfield 132 kV Line CB 96R2 tripped and auto reclosed.at Glen Innes.
AEMO did not instruct load shedding.
AEMO has not been advised of any disconnection of bulk electrical load.
The cause of this non credible contingency event is not known at this stage.
Manager NEM Real Time Operations
Update - Non-credible contingency event - Vic region - 09/07/2023
Refer AEMO ELECTRICITY MARKET NOTICE 108846
At 1527 hrs the Mortlake - Blue Gum 500kV Line and Blue Gum to DDWF Line were returned to service.
The cause of this non-credible contingency event has been identified and AEMO is satisfied that another occurrence of this event is unlikely under the current circumstances.
AEMO will not reclassify this event as a credible contingency event.
Manager NEM Real Time Operations
Non-credible contingency event - Vic region - 09/07/2023
Non-credible contingency event - Vic region - 09/07/2023
At 0653 hrs the following elements tripped;
- Mortlake PS - Blue Gum 500 kV Line,
- Blue Gum A1 500/220 kV Transformer
- Dundonnell WF tripped.
- MOPS G11 Trans No2 Bus 500 kV CB tripped
AEMO did not instruct load shedding.
AEMO has not been advised of any disconnection of bulk electrical load.
The cause of this non credible contingency event is not known at this stage.
Manager NEM Real Time Operations
Non-credible contingency event - Vic region - 29/06/2023
Non-credible contingency event - Vic region - 29/06/2023
At 1454 hrs the Altona - Keilor 220 kV line and the Salt Creek windfarm tripped.
AEMO did not instruct load shedding.
AEMO has not been advised of any disconnection of bulk electrical load.
The cause of this non credible contingency event is not known at this stage.
AEMO is not satisfied that this non credible event is unlikely to re-occur.
AEMO has therefore reclassified this event as a credible contingency event until further notice.
Region: Vic
Duration: 2045 hrs 29/06/2023 until further notice
Constraint set(s) invoked: Nil
Manager NEM Real Time Operations
STPASA - Cancellation of the Forecast Lack Of Reserve Level 3 (LOR3) in the SA Region on 27/06/2023
The Forecast LOR3 condition in the SA region advised in AEMO Electricity Market Notice No. 108747 is cancelled at 1000 hrs 26/06/2023.
AEMO Operations