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68391POWER SYSTEM EVENTS17/05/2019 12:38:02 PM
Non-credible contingency event - NSW Region - 17/05/2019
AEMO ELECTRICITY MARKET NOTICE
Non-credible contingency event - NSW Region - 17/05/2019
At 1208 hrs 17/05/2019 the Broken Hill No 2 220/22 kV Transformer and No 2 Section 22 kV Bus tripped.
(Also subsequent loss of Broken Hill Solar Farm and Silverton Wind Farm)
AEMO did not instruct load shedding.
AEMO has been advised of disconnection of 30 MW of bulk electrical load
The cause of this non credible contingency event is not known at this stage and is still under investigation.
The Bus and Transformer are still out of service
Manager NEM Real Time Operations
Non-credible contingency event - NSW Region - 17/05/2019
At 1208 hrs 17/05/2019 the Broken Hill No 2 220/22 kV Transformer and No 2 Section 22 kV Bus tripped.
(Also subsequent loss of Broken Hill Solar Farm and Silverton Wind Farm)
AEMO did not instruct load shedding.
AEMO has been advised of disconnection of 30 MW of bulk electrical load
The cause of this non credible contingency event is not known at this stage and is still under investigation.
The Bus and Transformer are still out of service
Manager NEM Real Time Operations
68390POWER SYSTEM EVENTS17/05/2019 12:36:44 PM
Non-credible contingency event - NSW Region - 17/05/2019
AEMO ELECTRICITY MARKET NOTICE
Non-credible contingency event - NSW Region - 17/05/2019
At 1143 hrs 17/05/2019 the Broken Hill No 1 220/22 kV Transformer and No 1 Section 22 kV Bus tripped.
AEMO did not instruct load shedding.
AEMO has been advised of disconnection of 4 MW of bulk electrical load.
The cause of this non credible contingency event is not known at this stage and is still under investigation.
The Bus and Transformer are still out of service
Manager NEM Real Time Operations
Non-credible contingency event - NSW Region - 17/05/2019
At 1143 hrs 17/05/2019 the Broken Hill No 1 220/22 kV Transformer and No 1 Section 22 kV Bus tripped.
AEMO did not instruct load shedding.
AEMO has been advised of disconnection of 4 MW of bulk electrical load.
The cause of this non credible contingency event is not known at this stage and is still under investigation.
The Bus and Transformer are still out of service
Manager NEM Real Time Operations
68279POWER SYSTEM EVENTS01/05/2019 06:13:19 PM
Non-credible contingency event - QLD Region - 01/05/2019
AEMO ELECTRICITY MARKET NOTICE.
Non-credible contingency event - QLD Region - 01/05/2019
At 1649 hrs the Pioneer Valley - Mackay 132 kV 7451 line opened at T38 Mackay end only.
At 1810 hrs the Line was restored.
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.
Manager NEM Real Time Operations
Non-credible contingency event - QLD Region - 01/05/2019
At 1649 hrs the Pioneer Valley - Mackay 132 kV 7451 line opened at T38 Mackay end only.
At 1810 hrs the Line was restored.
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.
Manager NEM Real Time Operations
68250POWER SYSTEM EVENTS30/04/2019 02:12:49 PM
Update - Non-credible contingency event - Qld region - 30/04/2019
AEMO ELECTRICITY MARKET NOTICE.
Update - Non-credible contingency event - Qld region - 30/04/2019
Refer AEMO ELECTRICITY MARKET NOTICE 68248
At 0817 hrs the Nebo SVC tripped during planned switching of the Nebo No.1 275/132kV transformer. While the Nebo No.1 transformer remains out of service, the trip of the Nebo No.2 275/132kV transformer will result in the trip of the Nebo SVC.
AEMO is not satisfied that this non credible event is unlikely to occur.
AEMO has therefore reclassified the trip of the Nebo SVC and the Nebo No.2 275/132kV transformer as a credible contingency event until further notice.
Manager NEM Real Time Operations
Update - Non-credible contingency event - Qld region - 30/04/2019
Refer AEMO ELECTRICITY MARKET NOTICE 68248
At 0817 hrs the Nebo SVC tripped during planned switching of the Nebo No.1 275/132kV transformer. While the Nebo No.1 transformer remains out of service, the trip of the Nebo No.2 275/132kV transformer will result in the trip of the Nebo SVC.
AEMO is not satisfied that this non credible event is unlikely to occur.
AEMO has therefore reclassified the trip of the Nebo SVC and the Nebo No.2 275/132kV transformer as a credible contingency event until further notice.
Manager NEM Real Time Operations
68248POWER SYSTEM EVENTS30/04/2019 12:23:55 PM
Non-credible contingency event - QLD region - 30/04/2019
AEMO ELECTRICITY MARKET NOTICE.
Non-credible contingency event - QLD region - 30/04/2019
At 0817 hrs the Nebo SVC tripped during planned switching of the Nebo No.1 275/132kV transformer.
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 - QLD region - 30/04/2019
At 0817 hrs the Nebo SVC tripped during planned switching of the Nebo No.1 275/132kV transformer.
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
68006POWER SYSTEM EVENTS02/04/2019 02:17:25 AM
Non-credible contingency event - SA region - 2/04/2019
AEMO ELECTRICITY MARKET NOTICE.
At 0136 hrs the Brinkworth - Templers West 275 kV Line tripped. At the same time CB 4552 and CB 4555 at Angaston opened.
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
At 0136 hrs the Brinkworth - Templers West 275 kV Line tripped. At the same time CB 4552 and CB 4555 at Angaston opened.
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
68005POWER SYSTEM EVENTS01/04/2019 06:48:52 PM
Non-credible contingency event - Qld region - 01/04/2019
AEMO ELECTRICITY MARKET NOTICE.
At 1744 hrs the following un-planned outage occurred.
South Pine - SS HIL (Hayes Inlet) 741 110 kV Line
South Pine - SS HIL (Hayes Inlet) 742 110 kV Line
SS GFN (Griffin) - SS HIL (Hayes Inlet) 7358 110 kV Line
AEMO did not instruct load shedding.
There was approximately 55 MW of load lost at SS HIL (Hayes Inlet) for approximately 20 seconds.
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
At 1744 hrs the following un-planned outage occurred.
South Pine - SS HIL (Hayes Inlet) 741 110 kV Line
South Pine - SS HIL (Hayes Inlet) 742 110 kV Line
SS GFN (Griffin) - SS HIL (Hayes Inlet) 7358 110 kV Line
AEMO did not instruct load shedding.
There was approximately 55 MW of load lost at SS HIL (Hayes Inlet) for approximately 20 seconds.
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
67930POWER SYSTEM EVENTS29/03/2019 09:06:43 AM
Non-credible contingency event - SA region - 29/03/2019
AEMO ELECTRICITY MARKET NOTICE.
Non-credible contingency event - SA region - 29/03/2019
At 0815 hrs the Ardrossan West - Dalrymple 132 kV Line tripped at Dalrymple end only, Dalrymple No1 and No2 Transformers tripped and Dalrymple -Wattle Point 132 kV Line 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 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 - SA region - 29/03/2019
At 0815 hrs the Ardrossan West - Dalrymple 132 kV Line tripped at Dalrymple end only, Dalrymple No1 and No2 Transformers tripped and Dalrymple -Wattle Point 132 kV Line 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 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
67925POWER SYSTEM EVENTS28/03/2019 09:09:10 PM
Non-credible contingency event - Qld region - 28/03/2019
AEMO ELECTRICITY MARKET NOTICE.
Non-credible contingency event - Qld region - 28/03/2019
At 1939 hrs the Tully Cardwell No. 7389 132 kV line tripped and reclosed and the Yabulu South - Ingham South No. 7133 132 kV line tripped at the Ingham South end only.
AEMO did not instruct load shedding.
AEMO has been advised of the disconnection of 14MW 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.
Manager NEM Real Time Operations
Non-credible contingency event - Qld region - 28/03/2019
At 1939 hrs the Tully Cardwell No. 7389 132 kV line tripped and reclosed and the Yabulu South - Ingham South No. 7133 132 kV line tripped at the Ingham South end only.
AEMO did not instruct load shedding.
AEMO has been advised of the disconnection of 14MW 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.
Manager NEM Real Time Operations