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79139POWER SYSTEM EVENTS23/10/2020 05:39:11 PM
Update - Non-credible contingency event - SA region - 23/10/2020
AEMO ELECTRICITY MARKET NOTICE.
Update - Non-credible contingency event - SA region - 23/10/2020
At 1442 hrs the Davenport - Bungama 275 kV Line and the East 275 kV Busbar at Davenport tripped.
At 1633 hrs The Davenport East 275 kV Busbar was returned to service. The Davenport - Bungama 275 kV line remains out of 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.
Manager NEM Real Time Operations
Update - Non-credible contingency event - SA region - 23/10/2020
At 1442 hrs the Davenport - Bungama 275 kV Line and the East 275 kV Busbar at Davenport tripped.
At 1633 hrs The Davenport East 275 kV Busbar was returned to service. The Davenport - Bungama 275 kV line remains out of 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.
Manager NEM Real Time Operations
79138SETTLEMENTS RESIDUE23/10/2020 05:30:33 PM
[EventId:202010231730_NRM_NSW1_VIC1_stopped] NEGRES CONSTRAINT NRM_NSW1_VIC1 ceased operating from 23 October 2020 17:30
AEMO ELECTRICITY MARKET NOTICE
Issued by Australian Energy Market Operator Ltd at 1730 hrs on 23 October 2020
CANCELLATION - ACTUAL NEGATIVE SETTLEMENT RESIDUES - NSW to VIC - 23 October 2020.
Refer to market notice: 79129
AEMO has ceased taking action to minimize the further accumulation of negative settlement residues on the NSW to VIC directional interconnector.
The negative residue constraint NRM_NSW1_VIC1 ceased operating at 1730 hrs on 23 October 2020.
This is an AEMO autogenerated Market Notice.
Issued by Australian Energy Market Operator Ltd at 1730 hrs on 23 October 2020
CANCELLATION - ACTUAL NEGATIVE SETTLEMENT RESIDUES - NSW to VIC - 23 October 2020.
Refer to market notice: 79129
AEMO has ceased taking action to minimize the further accumulation of negative settlement residues on the NSW to VIC directional interconnector.
The negative residue constraint NRM_NSW1_VIC1 ceased operating at 1730 hrs on 23 October 2020.
This is an AEMO autogenerated Market Notice.
79134MARKET INTERVENTION23/10/2020 05:03:10 PM
Direction - SA Region 23/10/2020
AEMO ELECTRICITY MARKET NOTICE.
Direction - SA Region 23/10/2020
In accordance with section 116 of the National Electricity Law, AEMO has issued a direction to a participant in the SA region. For the purposes of the National Electricity Rules this is a direction under clause 4.8.9(a).
The direction was necessary to maintain the power system in a secure operating state.
AEMO may issue or revoke additional directions in order to meet the current requirement, unless sufficient market response is provided. A further market notice will be issued when all directions related to this requirement have been cancelled.
The issue of the direction commences an AEMO intervention event. AEMO declares all dispatch intervals during the event to be intervention dispatch intervals, commencing from the interval ending 1705 hrs on 23/10/2020.
Intervention pricing does not apply to this AEMO intervention event.
Manager NEM Real Time Operations
Direction - SA Region 23/10/2020
In accordance with section 116 of the National Electricity Law, AEMO has issued a direction to a participant in the SA region. For the purposes of the National Electricity Rules this is a direction under clause 4.8.9(a).
The direction was necessary to maintain the power system in a secure operating state.
AEMO may issue or revoke additional directions in order to meet the current requirement, unless sufficient market response is provided. A further market notice will be issued when all directions related to this requirement have been cancelled.
The issue of the direction commences an AEMO intervention event. AEMO declares all dispatch intervals during the event to be intervention dispatch intervals, commencing from the interval ending 1705 hrs on 23/10/2020.
Intervention pricing does not apply to this AEMO intervention event.
Manager NEM Real Time Operations
79131RECLASSIFY CONTINGENCY23/10/2020 04:42:21 PM
Cancellation of the reclassification of a Non-Credible Contingency Event: Dederang - Glenrowan No. 1 and No. 3 220kV lines and Numurkah Solar Farm in VIC due to lightning.
AEMO ELECTRICITY MARKET NOTICE.
Cancellation of the reclassification of a non-credible contingency event as a credible contingency event due to lightning.
AEMO considers the simultaneous trip of the following circuits is no longer reasonably possible. There is no longer any lightning activity in the vicinity of the following lines. Accordingly, its classification has reverted to a non-credible contingency event.
Region: VIC
Lines: Dederang - Glenrowan No. 1 and No. 3 220kV lines and Numurkah Solar Farm
Cancellation time: 16:40 hrs 23/10/2020
Constraint set(s) revoked: V-NIL_DDGN_NSF_N-2
Refer AEMO Electricity Market Notice 79122
Manager NEM Real Time Operations
Cancellation of the reclassification of a non-credible contingency event as a credible contingency event due to lightning.
AEMO considers the simultaneous trip of the following circuits is no longer reasonably possible. There is no longer any lightning activity in the vicinity of the following lines. Accordingly, its classification has reverted to a non-credible contingency event.
Region: VIC
Lines: Dederang - Glenrowan No. 1 and No. 3 220kV lines and Numurkah Solar Farm
Cancellation time: 16:40 hrs 23/10/2020
Constraint set(s) revoked: V-NIL_DDGN_NSF_N-2
Refer AEMO Electricity Market Notice 79122
Manager NEM Real Time Operations
79130RESERVE NOTICE23/10/2020 04:27:50 PM
Actual Lack Of Reserve Level 1 (LOR1) in the NSW region - 23/10/2020
AEMO ELECTRICITY MARKET NOTICE
Actual Lack Of Reserve Level 1 (LOR1) in the NSW region - 23/10/2020
An Actual LOR1 condition has been declared under clause 4.8.4(b) of the National Electricity Rules for the NSW region from 1630 hrs.
The Actual LOR1 condition is forecast to exist until 1730 hrs.
The capacity reserve requirement is 1380 MW
The minimum capacity reserve available is 1207 MW
Manager NEM Real Time Operations
Actual Lack Of Reserve Level 1 (LOR1) in the NSW region - 23/10/2020
An Actual LOR1 condition has been declared under clause 4.8.4(b) of the National Electricity Rules for the NSW region from 1630 hrs.
The Actual LOR1 condition is forecast to exist until 1730 hrs.
The capacity reserve requirement is 1380 MW
The minimum capacity reserve available is 1207 MW
Manager NEM Real Time Operations
79129SETTLEMENTS RESIDUE23/10/2020 04:05:18 PM
[EventId:202010231605_NRM_NSW1_VIC1_started] NEGRES CONSTRAINT NRM_NSW1_VIC1 started operating from 23 October 2020 16:05
AEMO ELECTRICITY MARKET NOTICE
Issued by Australian Energy Market Operator Ltd at 1605 hrs on 23 October 2020
ACTUAL NEGATIVE SETTLEMENT RESIDUES - NSW to VIC - 23 October 2020.
Electricity Market outcomes have resulted in the accumulation of negative settlement residues that have exceeded the allowable negative residue threshold for the NSW to VIC directional interconnector.
The negative residue constraint set NRM_NSW1_VIC1 commenced operating from 1605 hrs on 23 October 2020.
This constraint set contains an equation with the following interconnectors on the LHS:
VIC1-NSW1
The RHS of the constraint equation may be adjusted to manage residues.
This is an AEMO autogenerated Market Notice.
Issued by Australian Energy Market Operator Ltd at 1605 hrs on 23 October 2020
ACTUAL NEGATIVE SETTLEMENT RESIDUES - NSW to VIC - 23 October 2020.
Electricity Market outcomes have resulted in the accumulation of negative settlement residues that have exceeded the allowable negative residue threshold for the NSW to VIC directional interconnector.
The negative residue constraint set NRM_NSW1_VIC1 commenced operating from 1605 hrs on 23 October 2020.
This constraint set contains an equation with the following interconnectors on the LHS:
VIC1-NSW1
The RHS of the constraint equation may be adjusted to manage residues.
This is an AEMO autogenerated Market Notice.
79128RECLASSIFY CONTINGENCY23/10/2020 04:01:03 PM
Reclassification of a Non-Credible Contingency Event: Bulli Creek - Dumaresq 8L 330KV line and Bulli Creek - Dumaresq 8M 330KV line in QLD1 due to Lightning.
AEMO ELECTRICITY MARKET NOTICE
Reclassification of a Non-Credible Contingency Event as a Credible Contingency Event due to Lightning. AEMO considers the simultaneous trip of the following circuits to now be more likely and reasonably possible. Accordingly AEMO has reclassified it as a credible contingency event.
Region: QLD1
Lines: Bulli Creek - Dumaresq 8L 330KV and Bulli Creek - Dumaresq 8M 330KV
Duration: 23/10/2020 16:00 until further notice
Constraint set(s) invoked:
I-QNI_ONE_PHASE_N-2 Constraint set contains the following interconnector(s) on the left hand side:
NSW1-QLD1
Auto-generated on behalf of Manager NEM Real Time Operations
Reclassification of a Non-Credible Contingency Event as a Credible Contingency Event due to Lightning. AEMO considers the simultaneous trip of the following circuits to now be more likely and reasonably possible. Accordingly AEMO has reclassified it as a credible contingency event.
Region: QLD1
Lines: Bulli Creek - Dumaresq 8L 330KV and Bulli Creek - Dumaresq 8M 330KV
Duration: 23/10/2020 16:00 until further notice
Constraint set(s) invoked:
I-QNI_ONE_PHASE_N-2 Constraint set contains the following interconnector(s) on the left hand side:
NSW1-QLD1
Auto-generated on behalf of Manager NEM Real Time Operations
79127INTER-REGIONAL TRANSFER23/10/2020 03:17:30 PM
Inter-regional transfer limit variation - Davenport - Bungama 275 kV Line - SA region - 23/10/2020
AEMO ELECTRICITY MARKET NOTICE
Inter-regional transfer limit variation - Davenport - Bungama 275 kV Line - SA region - 23/10/2020
Refer AEMO Electricity Market Notice 79126
At 1442 hrs there was an unplanned outage of the Davenport - Bungama 275 kV Line.
The following constraint set invoked at 1500 hrs
S-BGDV
This constraint set(s) contains equations with the following interconnectors on the LHS.
V-S-MNSP1
Refer to the AEMO Network Outage Scheduler for further information.
Manager NEM Real Time Operations
Inter-regional transfer limit variation - Davenport - Bungama 275 kV Line - SA region - 23/10/2020
Refer AEMO Electricity Market Notice 79126
At 1442 hrs there was an unplanned outage of the Davenport - Bungama 275 kV Line.
The following constraint set invoked at 1500 hrs
S-BGDV
This constraint set(s) contains equations with the following interconnectors on the LHS.
V-S-MNSP1
Refer to the AEMO Network Outage Scheduler for further information.
Manager NEM Real Time Operations
79126POWER SYSTEM EVENTS23/10/2020 03:07:49 PM
Non-credible contingency event - SA region - 23/10/2020
AEMO ELECTRICITY MARKET NOTICE.
Non-credible contingency event - SA region - 23/10/2020
At 1442 hrs the Davenport - Bungama 275 kV Line and the East 275 kV Busbar at Davenport 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 - SA region - 23/10/2020
At 1442 hrs the Davenport - Bungama 275 kV Line and the East 275 kV Busbar at Davenport 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