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58398POWER SYSTEM EVENTS18/04/2017 05:45:58 PM
Cancellation - Non-credible contingency event - Vic region - 18/04/17
AEMO ELECTRICITY MARKET NOTICE
Cancellation - Non-credible contingency event - Vic region - 18/04/17
Update to AEMO Electricity Market Notice 58395
AEMO has received further information regarding this event. The protection that tripped the Moorabool - Mortlake 500 kV Line at the Moorabool end only operated as per design. Hence, AEMO no longer considers this to be a non-credible contingency event.
The Moorabool - Mortlake 500 kV Line remains out of service. Refer to AEMO Network Outage Scheduler (NOS) for further details.
Manager NEM Real Time Operations
Cancellation - Non-credible contingency event - Vic region - 18/04/17
Update to AEMO Electricity Market Notice 58395
AEMO has received further information regarding this event. The protection that tripped the Moorabool - Mortlake 500 kV Line at the Moorabool end only operated as per design. Hence, AEMO no longer considers this to be a non-credible contingency event.
The Moorabool - Mortlake 500 kV Line remains out of service. Refer to AEMO Network Outage Scheduler (NOS) for further details.
Manager NEM Real Time Operations
58395POWER SYSTEM EVENTS18/04/2017 12:43:07 PM
Non-credible contingency event - Vic region - 18/04/17
AEMO ELECTRICITY MARKET NOTICE
Non-credible contingency event - Vic region - 18/04/17
Update to AEMO Electricity Market Notice 58394
At 1107 hrs the Moorabool - Mortlake 500 kV Line tripped at the Moorabool end only.
At 1110 hrs the Moorabool - Mortlake 500 kV Line was manually de-energised by opening at the Mortlake end.
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 - 18/04/17
Update to AEMO Electricity Market Notice 58394
At 1107 hrs the Moorabool - Mortlake 500 kV Line tripped at the Moorabool end only.
At 1110 hrs the Moorabool - Mortlake 500 kV Line was manually de-energised by opening at the Mortlake end.
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
58391POWER SYSTEM EVENTS15/04/2017 08:10:36 PM
Update - Non-credible contingency event - NSW Region - 15 Apr 2017
AEMO ELECTRICITY MARKET NOTICE
Update - Non-credible contingency event - NSW Region - 15 Apr 2017
Refer Market Notice 58390
At 1644 hrs the Broken Hill No 2 220/22 kV Transformer and No 2 Section 22 kV Bus tripped. This equipment has been 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 - NSW Region - 15 Apr 2017
Refer Market Notice 58390
At 1644 hrs the Broken Hill No 2 220/22 kV Transformer and No 2 Section 22 kV Bus tripped. This equipment has been 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
58390POWER SYSTEM EVENTS15/04/2017 05:59:50 PM
Non-credible contingency event - NSW Region - 15 Apr 2017
AEMO ELECTRICITY MARKET NOTICE
Non-credible contingency event - NSW Region - 15 Apr 2017
At 1644 hrs 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)
AEMO did not instruct load shedding.
AEMO has been advised of disconnection of 14 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 - 15 Apr 2017
At 1644 hrs 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)
AEMO did not instruct load shedding.
AEMO has been advised of disconnection of 14 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
58335POWER SYSTEM EVENTS04/04/2017 03:35:48 PM
Update- Non-credible contingency event - Qld Region - 04/04/2017
AEMO ELECTRICITY MARKET NOTICE
Update- Non-credible contingency event - Qld Region - 04/04/2017
Refer Market Notice 58331
At 0307 hrs trip of the Murarrie No.1 110 kV Bus coincident with trip of 7270 Murarrie - Lytton Bulk Supply 110 kV Line.
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 - 04/04/2017
Refer Market Notice 58331
At 0307 hrs trip of the Murarrie No.1 110 kV Bus coincident with trip of 7270 Murarrie - Lytton Bulk Supply 110 kV Line.
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
58331POWER SYSTEM EVENTS04/04/2017 04:50:37 AM
Non-credible contingency event - Qld Region - 04/04/2017
AEMO ELECTRICITY MARKET NOTICE
Non-credible contingency event - Qld Region - 04/04/2017
At 0307 hrs trip of the Murarrie No.1 110 kV Bus coincident with trip of 7270 Murarrie - Lytton Bulk Supply 110 kV Line.
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 - 04/04/2017
At 0307 hrs trip of the Murarrie No.1 110 kV Bus coincident with trip of 7270 Murarrie - Lytton Bulk Supply 110 kV Line.
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
58287POWER SYSTEM EVENTS29/03/2017 09:59:48 AM
Update - Non-credible contingency event - Qld region - 29/03/17
AEMO ELECTRICITY MARKET NOTICE
Refer AEMO Electricity Market Notice 58285
At 0840 hrs 29/03/17 the Mudgeeraba No. 2 and No. 4 110 kV Bus tripped.
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
Refer AEMO Electricity Market Notice 58285
At 0840 hrs 29/03/17 the Mudgeeraba No. 2 and No. 4 110 kV Bus tripped.
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
58285POWER SYSTEM EVENTS29/03/2017 09:14:04 AM
Non-credible contingency event - Qld region - 29/03/17
AEMO ELECTRICITY MARKET NOTICE
Non-credible contingency event - Qld region - 29/03/17
At 0840 hrs 29/03/17 the Mudgeeraba No. 2 and No. 4 110 kV Bus tripped. This bus trip also tripped Mudgeeraba - Terranora No. 758 110 kV Line which interrupted supply to Terranora substation.
Note: Mudgeeraba - Terranora No. 757 110 kV Line was out of service (planned outage)
AEMO did not instruct load shedding.
The interruption to supply at Terranora substation resulted in approximately 35 MW of load lost.
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 - 29/03/17
At 0840 hrs 29/03/17 the Mudgeeraba No. 2 and No. 4 110 kV Bus tripped. This bus trip also tripped Mudgeeraba - Terranora No. 758 110 kV Line which interrupted supply to Terranora substation.
Note: Mudgeeraba - Terranora No. 757 110 kV Line was out of service (planned outage)
AEMO did not instruct load shedding.
The interruption to supply at Terranora substation resulted in approximately 35 MW of load lost.
The cause of this non credible contingency event is not known at this stage.
Manager NEM Real Time Operations
58255POWER SYSTEM EVENTS27/03/2017 07:01:29 PM
Non-credible contingency event - NSW Region - 27/03/2017
AEMO ELECTRICITY MARKET NOTICE
Non-credible contingency event - NSW Region - 27/03/2017
At 1828 hrs the Cooma-Williamsdale 97D 132 kV Line opened at the Williamsdale end only.
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 - NSW Region - 27/03/2017
At 1828 hrs the Cooma-Williamsdale 97D 132 kV Line opened at the Williamsdale end only.
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