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58037POWER SYSTEM EVENTS15/03/2017 05:42:12 PM
Update - Non-credible contingency event - Vic region - 15/03/17
AEMO ELECTRICITY MARKET NOTICE
Update - Non-credible contingency event - Vic region - 15/03/17
Refer to AEMO Electricity Market Notice 58008 and 58024
At 0307 hrs at Heywood 500 kV terminal station, the South East No. 2 Line / M2 transformer 275 kV CB opened. The circuit breaker was closed at 0309 hrs placing the M2 transformer on load.
Based on updated information from AusNet Services, AEMO will not reclassify this event as a credible contingency event.
Manager NEM Real Time Operations
Update - Non-credible contingency event - Vic region - 15/03/17
Refer to AEMO Electricity Market Notice 58008 and 58024
At 0307 hrs at Heywood 500 kV terminal station, the South East No. 2 Line / M2 transformer 275 kV CB opened. The circuit breaker was closed at 0309 hrs placing the M2 transformer on load.
Based on updated information from AusNet Services, AEMO will not reclassify this event as a credible contingency event.
Manager NEM Real Time Operations
58014POWER SYSTEM EVENTS15/03/2017 07:53:09 AM
AEMO ELECTRICITY MARKET NOTICE
Non-credible contingency event - Qld region - 14/03/17
At 2003 hrs on 14/03/17 there was a single phase trip and auto-reclose of the Calvale - Halys No. 8810 and No. 8811 275 kV Transmission Lines.
AEMO did not instruct load shedding.
AEMO has not been advised of any disconnection of bulk electrical load.
There was lightning in the vicinity at the time of this event. AEMO will not be declaring these transmission lines as "vulnerable" because it was a single phase trip. Refer to AEMO procedure SO_OP_3715 for further information on lightning trips.
AEMO will not reclassify this event as a credible contingency event.
Manager NEM Real Time Operations
Non-credible contingency event - Qld region - 14/03/17
AEMO ELECTRICITY MARKET NOTICE
Non-credible contingency event - Qld region - 14/03/17
At 2003 hrs on 14/03/17 there was a single phase trip and auto-reclose of the Calvale - Halys No. 8810 and No. 8811 275 kV Transmission Lines.
AEMO did not instruct load shedding.
AEMO has not been advised of any disconnection of bulk electrical load.
There was lightning in the vicinity at the time of this event. AEMO will not be declaring these transmission lines as "vulnerable" because it was a single phase trip. Refer to AEMO procedure SO_OP_3715 for further information on lightning trips.
AEMO will not reclassify this event as a credible contingency event.
Manager NEM Real Time Operations
58008POWER SYSTEM EVENTS15/03/2017 03:29:02 AM
Non-credible contingency event - Vic region - 15/03/17
AEMO ELECTRICITY MARKET NOTICE
Non-credible contingency event - Vic region - 15/03/17
At 0307 hrs at Heywood 500kV terminal station the SESS No2 Line /M2 transformer CB 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.
At 0309 hrs at Heywood 500kV terminal station the SESS No2 Line /M2 transformer CB was closed.
Manager NEM Real Time Operations
Non-credible contingency event - Vic region - 15/03/17
At 0307 hrs at Heywood 500kV terminal station the SESS No2 Line /M2 transformer CB 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.
At 0309 hrs at Heywood 500kV terminal station the SESS No2 Line /M2 transformer CB was closed.
Manager NEM Real Time Operations
57823POWER SYSTEM EVENTS03/03/2017 06:49:13 PM
Update Non-credible contingency event - SA region - 03 03 2017
AEMO ELECTRICITY MARKET NOTICE
Update Non-credible contingency event - SA region - 03 03 2017
Refer to AEMO Electricity Market Notice MN 57817
The cause of this non credible contingency event has been identified and is not expected to re-occur.
AEMO will not reclassify this event as a credible contingency event.
Manager NEM Real Time Operations
Update Non-credible contingency event - SA region - 03 03 2017
Refer to AEMO Electricity Market Notice MN 57817
The cause of this non credible contingency event has been identified and is not expected to re-occur.
AEMO will not reclassify this event as a credible contingency event.
Manager NEM Real Time Operations
57817POWER SYSTEM EVENTS03/03/2017 04:05:32 PM
Non-credible contingency event - SA region - 03 03 2017
AEMO ELECTRICITY MARKET NOTICE
Non-credible contingency event - SA region - 03 03 2017
At 1503 hrs multiple generating units in SA 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 will not reclassify this event as a credible contingency event.
Manager NEM Real Time Operations
Non-credible contingency event - SA region - 03 03 2017
At 1503 hrs multiple generating units in SA 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 will not reclassify this event as a credible contingency event.
Manager NEM Real Time Operations
57639POWER SYSTEM EVENTS21/02/2017 06:57:49 AM
Non-credible contingency event - Victoria region - 21/02/2017
AEMO ELECTRICITY MARKET NOTICE
Non-credible contingency event - Victoria region - 21/02/2017
At 0554 hrs the Eildon Power Station to Mount Beauty Terminal Station No 2 220kV line tripped at the Mount Beauty end only. The line was manually placed on load at 0555 hrs.
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 not been identified and AEMO is not satisfied that another occurrence of this event is unlikely under the current circumstances.
AEMO is reclassifying the trip of the Eildon Power Station to Mount Beauty Terminal Station No 2 220kV line at the Mount Beauty end only as a credible contingency event from 0555 hrs 21/02/2017.
Manager NEM Real Time Operations
Non-credible contingency event - Victoria region - 21/02/2017
At 0554 hrs the Eildon Power Station to Mount Beauty Terminal Station No 2 220kV line tripped at the Mount Beauty end only. The line was manually placed on load at 0555 hrs.
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 not been identified and AEMO is not satisfied that another occurrence of this event is unlikely under the current circumstances.
AEMO is reclassifying the trip of the Eildon Power Station to Mount Beauty Terminal Station No 2 220kV line at the Mount Beauty end only as a credible contingency event from 0555 hrs 21/02/2017.
Manager NEM Real Time Operations
57601POWER SYSTEM EVENTS19/02/2017 09:20:40 AM
Non-credible contingency event - Victoria region - 19/02/17
AEMO ELECTRICITY MARKET NOTICE
Non-credible contingency event - Victoria region - 19/02/17
At 0754 hrs the Eildon power station No 2 22kV 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 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 - Victoria region - 19/02/17
At 0754 hrs the Eildon power station No 2 22kV 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 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
57509POWER SYSTEM EVENTS13/02/2017 05:36:21 PM
Non-credible contingency event - Qld region - 13/02/17
AEMO ELECTRICITY MARKET NOTICE
Non-credible contingency event - Qld region - 13/02/17
At 1709 hrs there was an unplanned outage of the following plant
H12 Mt England No. 1 275 kV Bus
Mt England - Wivenhoe PS No. 823 275 kV Line
Mt England - Tarong No. 837 275 kV Line
At approximately the same time (to be confirmed), Blackwall - Tarong No. 875 275 kV Line tripped. This line was placed back into service at 1710 hrs.
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 - 13/02/17
At 1709 hrs there was an unplanned outage of the following plant
H12 Mt England No. 1 275 kV Bus
Mt England - Wivenhoe PS No. 823 275 kV Line
Mt England - Tarong No. 837 275 kV Line
At approximately the same time (to be confirmed), Blackwall - Tarong No. 875 275 kV Line tripped. This line was placed back into service at 1710 hrs.
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
57482POWER SYSTEM EVENTS13/02/2017 04:27:03 AM
Correction Non-credible contingency event - Qld region - Monday, 13 February 2017.
AEMO ELECTRICITY MARKET NOTICE
Correction to date of notice 57481
Non-credible contingency event - Qld region - Monday, 13 February 2017.
At 0340 hrs at H12 Mt England the following lines have tripped and remain out of service,
the Wivenhoe PS 823 and 824 275 kV lines,
the South Pine 825 275 kV line, and
the Tarong 8812 275 kV line which tripped and has auto re-closed.
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
Correction to date of notice 57481
Non-credible contingency event - Qld region - Monday, 13 February 2017.
At 0340 hrs at H12 Mt England the following lines have tripped and remain out of service,
the Wivenhoe PS 823 and 824 275 kV lines,
the South Pine 825 275 kV line, and
the Tarong 8812 275 kV line which tripped and has auto re-closed.
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