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125273POWER SYSTEM EVENTS05/03/2025 02:03:49 PM
Update - Non-credible contingency event - NSW region - 05/03/2025
AEMO ELECTRICITY MARKET NOTICE.
Update - Non-credible contingency event - NSW region - 05/03/2025
Refer AEMO Electricity Market Notice 125268
At 1400 hrs the Directlink DC1 was returned to service.
(At 1030 hrs the Ewingsdale-Mullumbimby 9G5 132kV line 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 - NSW region - 05/03/2025
Refer AEMO Electricity Market Notice 125268
At 1400 hrs the Directlink DC1 was returned to service.
(At 1030 hrs the Ewingsdale-Mullumbimby 9G5 132kV line 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
125268POWER SYSTEM EVENTS05/03/2025 11:57:45 AM
Non-credible contingency event - NSW region - 05/03/2025
AEMO ELECTRICITY MARKET NOTICE.
Non-credible contingency event - NSW region - 05/03/2025
At 1030 hrs the Ewingsdale-Mullumbimby 9G5 132kV line and the Directlink DC1 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 - NSW region - 05/03/2025
At 1030 hrs the Ewingsdale-Mullumbimby 9G5 132kV line and the Directlink DC1 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
125267INTER-REGIONAL TRANSFER05/03/2025 10:51:27 AM
Inter-Regional Transfer limit variation - Directlink - NSW Region
AEMO ELECTRICITY MARKET NOTICE
Inter-Regional Transfer limit variation - Directlink - NSW Region
There has been an unplanned outage of the No 1 Leg of Directlink .
The following constraint set was invoked at 1040 hrs 05/03/2025
N-X_MBTE_2
The constraint set contains the following interconnector on the left hand side.
N-Q-MNSP1
Refer AEMO Network Outage Scheduler (NOS) for further details.
Manager NEM Real Time Operations
Inter-Regional Transfer limit variation - Directlink - NSW Region
There has been an unplanned outage of the No 1 Leg of Directlink .
The following constraint set was invoked at 1040 hrs 05/03/2025
N-X_MBTE_2
The constraint set contains the following interconnector on the left hand side.
N-Q-MNSP1
Refer AEMO Network Outage Scheduler (NOS) for further details.
Manager NEM Real Time Operations
125219INTER-REGIONAL TRANSFER03/03/2025 11:31:48 AM
Inter-regional transfer limit variation - Halys - Tarong 8868 275 kV Line - QLD region - 03/03/2025
AEMO ELECTRICITY MARKET NOTICE
Inter-regional transfer limit variation - Halys - Tarong 8868 275 kV Line - QLD region - 03/03/2025
At 1115 hrs 03/03/2025 there was a short notice outage of Halys - Tarong 8868 275 kV Line.
The following constraint set(s) invoked at 1115 hrs 03/03/2025
Q-HATR
This constraint set(s) contains equations with the following interconnectors on the LHS.
N-Q-MNSP1,NSW1-QLD1
Refer to the AEMO Network Outage Scheduler for further information.
Manager NEM Real Time Operations
Inter-regional transfer limit variation - Halys - Tarong 8868 275 kV Line - QLD region - 03/03/2025
At 1115 hrs 03/03/2025 there was a short notice outage of Halys - Tarong 8868 275 kV Line.
The following constraint set(s) invoked at 1115 hrs 03/03/2025
Q-HATR
This constraint set(s) contains equations with the following interconnectors on the LHS.
N-Q-MNSP1,NSW1-QLD1
Refer to the AEMO Network Outage Scheduler for further information.
Manager NEM Real Time Operations
125138INTER-REGIONAL TRANSFER01/03/2025 02:46:35 PM
Inter-regional transfer limit variation - constraint automation to manage Power System Security in NSW region - 01/03/2025
AEMO ELECTRICITY MARKET NOTICE
In order to maintain the power system in a secure operating state in the NSW region, AEMO has invoked automated constraint set CA_BRIS_56D513DF from 1430 hrs until further notice.
This constraint set contains equations with the following interconnector on the LHS;
VIC1-NSW1
Manager NEM Real Time Operations
In order to maintain the power system in a secure operating state in the NSW region, AEMO has invoked automated constraint set CA_BRIS_56D513DF from 1430 hrs until further notice.
This constraint set contains equations with the following interconnector on the LHS;
VIC1-NSW1
Manager NEM Real Time Operations
125081CONSTRAINTS25/02/2025 08:31:51 AM
Yass to Wagga control scheme change - removal system normal constraint equations in NSW managing 990, 991 and 970 132kV lines
AEMO ELECTRICITY MARKET NOTICE
Transgrid has advised AEMO of an update to the Yass overload trip scheme. The scheme is normally armed managing line flow on 990, 991, 970 132kV lines and it is now operating both directions of flow from Wagga to Yass.
Based on this advice, the following constraint equations will be removed from the NSW system normal constraint sets N-NIL and N-NIL_991, effective immediately.
N>>NIL_970_051
N>>NIL_990_051
N>>NIL_991_051
Ben Blake
AEMO Operations
Transgrid has advised AEMO of an update to the Yass overload trip scheme. The scheme is normally armed managing line flow on 990, 991, 970 132kV lines and it is now operating both directions of flow from Wagga to Yass.
Based on this advice, the following constraint equations will be removed from the NSW system normal constraint sets N-NIL and N-NIL_991, effective immediately.
N>>NIL_970_051
N>>NIL_990_051
N>>NIL_991_051
Ben Blake
AEMO Operations
125026INTER-REGIONAL TRANSFER23/02/2025 03:44:24 AM
Inter-regional transfer limit variation - BassLink Harmonic Filter - TAS region - 23/02/2025
AEMO ELECTRICITY MARKET NOTICE
Inter-regional transfer limit variation - BassLink Harmonic Filter - TAS region - 23/02/2025
At 0305 hrs 23/02/2025 there was an unplanned outage of BassLink Harmonic Filter.
The following constraint set(s) invoked at 0305 hrs 23/02/2025
T-BLGC_HF_43MVAR
This constraint set(s) contains equations with the following interconnectors on the LHS.
T-V-MNSP1
Refer to the AEMO Network Outage Scheduler for further information.
Manager NEM Real Time Operations
Inter-regional transfer limit variation - BassLink Harmonic Filter - TAS region - 23/02/2025
At 0305 hrs 23/02/2025 there was an unplanned outage of BassLink Harmonic Filter.
The following constraint set(s) invoked at 0305 hrs 23/02/2025
T-BLGC_HF_43MVAR
This constraint set(s) contains equations with the following interconnectors on the LHS.
T-V-MNSP1
Refer to the AEMO Network Outage Scheduler for further information.
Manager NEM Real Time Operations
124986INTER-REGIONAL TRANSFER22/02/2025 08:11:27 AM
Inter-regional transfer limit variation - Collector Windfarm - Yass (3L) 330 kV line - NSW region - 22/02/2025
AEMO ELECTRICITY MARKET NOTICE
Inter-regional transfer limit variation - Collector Windfarm - Yass (3L) 330 kV line - NSW region - 22/02/2025
A planned outage of Collector Windfarm - Yass (3L) 330 kV line in the NSW region was scheduled from 0600 hrs 17/02/2025 to 1600 hrs 24/02/2025.
The outage has been completed and Collector Windfarm - Yass (3L) 330 kV line returned to service at 0746 hrs 22/02/2025
Constraint set(s) revoked: N-CTYS_3L_WG_CLOSE
Manager NEM Real Time Operations
Inter-regional transfer limit variation - Collector Windfarm - Yass (3L) 330 kV line - NSW region - 22/02/2025
A planned outage of Collector Windfarm - Yass (3L) 330 kV line in the NSW region was scheduled from 0600 hrs 17/02/2025 to 1600 hrs 24/02/2025.
The outage has been completed and Collector Windfarm - Yass (3L) 330 kV line returned to service at 0746 hrs 22/02/2025
Constraint set(s) revoked: N-CTYS_3L_WG_CLOSE
Manager NEM Real Time Operations
124966POWER SYSTEM EVENTS21/02/2025 11:03:25 AM
Update - Non-credible contingency event - NSW region - 21/02/2025
AEMO ELECTRICITY MARKET NOTICE.
Update - Non-credible contingency event - NSW region - 21/02/2025
Refer AEMO Electricity Market Notice 124944
At 1030 hrs the Capital WF A and C 330kV Buses 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
Update - Non-credible contingency event - NSW region - 21/02/2025
Refer AEMO Electricity Market Notice 124944
At 1030 hrs the Capital WF A and C 330kV Buses 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