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70694GENERAL NOTICE25/10/2019 06:20:49 PM
Network Augmentation Commissioned - NSW Region - 25/10/2019
AEMO ELECTRICITY MARKET NOTICE
Network Augmentation Commissioned - NSW Region - 25/10/2019
A network augmentation has been commissioned in the NSW region as follows:
Grafton East substation has been cut into the existing Coffs Harbour - Koolkhan 96H 132 kV Transmission line to form the following circuits:
Coffs Harbour - Grafton East 96H 132 kV Transmission line
Koolkhan - Grafton East 9W0 132 kV Transmission line
Manager NEM Real Time Operations
Network Augmentation Commissioned - NSW Region - 25/10/2019
A network augmentation has been commissioned in the NSW region as follows:
Grafton East substation has been cut into the existing Coffs Harbour - Koolkhan 96H 132 kV Transmission line to form the following circuits:
Coffs Harbour - Grafton East 96H 132 kV Transmission line
Koolkhan - Grafton East 9W0 132 kV Transmission line
Manager NEM Real Time Operations
70678GENERAL NOTICE25/10/2019 01:11:51 AM
Cancellation - Contingency event more likely to occur due to abnormal conditions - SA region.
AEMO ELECTRICITY MARKET NOTICE.
At 0110 hrs 25/10/2019 the abnormal conditions advised in AEMO Electricity Market Notice 70665 have ceased to impact the likelihood of a non-credible event occurring.
Constraint set I-VS_250 revoked at 0110 hrs.
Manager NEM Real Time Operations
At 0110 hrs 25/10/2019 the abnormal conditions advised in AEMO Electricity Market Notice 70665 have ceased to impact the likelihood of a non-credible event occurring.
Constraint set I-VS_250 revoked at 0110 hrs.
Manager NEM Real Time Operations
70665GENERAL NOTICE24/10/2019 10:16:45 PM
Contingency event more likely to occur due to abnormal conditions - SA region.
AEMO ELECTRICITY MARKET NOTICE.
AEMO has identified that abnormal conditions exist in the South Australia region, namely severe weather which increases the risk of a contingency event occurring.
Given the increased risk, AEMO has applied the following constraint to manage the impact of any such contingency event:
I-VS_250
Further notices will only be published to advise of any additional limitations, or when the abnormal conditions have ceased to impact the likelihood of a contingency event occurring.
Manager NEM Real Time Operations
AEMO has identified that abnormal conditions exist in the South Australia region, namely severe weather which increases the risk of a contingency event occurring.
Given the increased risk, AEMO has applied the following constraint to manage the impact of any such contingency event:
I-VS_250
Further notices will only be published to advise of any additional limitations, or when the abnormal conditions have ceased to impact the likelihood of a contingency event occurring.
Manager NEM Real Time Operations
70654GENERAL NOTICE24/10/2019 12:02:45 PM
Update to 500 kV Moorabool - Tarrone line outage and concurrent 500 kV outages at Heywood (Bus No.1) and Heywood - Tarrone line.
For Moorabool (MLTS) - Tarrone (TRTS) 500 kV line outage: refer to AEMO Electricity Market Notice 70009.
For this outage please note change to the start time of the MLTS - TRTS line outage as follows:
- on 29/10, 30/10 and 31/10/2019 - planned to start at 0530 hrs (previous 0700 hrs)
In addition, please note scheduled planned outage of the Heywood (HYTS) No.1 500 kV Bus as follows:
- on 29/10, 30/10 and 31/10/2019 - planned to be out of service from 0500 hrs to 1830 hrs.
This bus outage offload Heywood M1 500/275 kV transformer and MLTS - TRTS line
A credible contingency event during these planned outages could cause synchronous separation of the South Australia (SA) region from the rest of the NEM. If separation occurs, load may be interrupted due to the operation of the Automatic Under Frequency Load Shedding (AUFLS) scheme in SA.
The credible separation contingency is managed as follows:
- When power transfer is from SA to VIC, contingency lower FCAS will be sourced from SA.
- When power transfer is from VIC to SA, due to the 47-52 Hz island separation frequency band advised by the SA jurisdiction, contingency raise FCAS is not sourced in SA and the AUFLS scheme may respond to low frequency events.
- Power transfer will be restricted sufficiently low on VIC - SA interconnector (Heywood interconnector) to manage system security following the loss of the next contingency.
Forecast capacity reserves in the SA region are currently sufficient to meet electricity demand during the planned outage.
Please note the following constraint set are invoked for these outages:
F-I-HYSE, I-VS_050, S-X_BC_CP, V-HYTX_M12, V-HY_500BUS, V-MLTR.
Please refer to AEMO Network Outage Scheduler (NOS) for further details.
Mya San
AEMO Operations
For this outage please note change to the start time of the MLTS - TRTS line outage as follows:
- on 29/10, 30/10 and 31/10/2019 - planned to start at 0530 hrs (previous 0700 hrs)
In addition, please note scheduled planned outage of the Heywood (HYTS) No.1 500 kV Bus as follows:
- on 29/10, 30/10 and 31/10/2019 - planned to be out of service from 0500 hrs to 1830 hrs.
This bus outage offload Heywood M1 500/275 kV transformer and MLTS - TRTS line
A credible contingency event during these planned outages could cause synchronous separation of the South Australia (SA) region from the rest of the NEM. If separation occurs, load may be interrupted due to the operation of the Automatic Under Frequency Load Shedding (AUFLS) scheme in SA.
The credible separation contingency is managed as follows:
- When power transfer is from SA to VIC, contingency lower FCAS will be sourced from SA.
- When power transfer is from VIC to SA, due to the 47-52 Hz island separation frequency band advised by the SA jurisdiction, contingency raise FCAS is not sourced in SA and the AUFLS scheme may respond to low frequency events.
- Power transfer will be restricted sufficiently low on VIC - SA interconnector (Heywood interconnector) to manage system security following the loss of the next contingency.
Forecast capacity reserves in the SA region are currently sufficient to meet electricity demand during the planned outage.
Please note the following constraint set are invoked for these outages:
F-I-HYSE, I-VS_050, S-X_BC_CP, V-HYTX_M12, V-HY_500BUS, V-MLTR.
Please refer to AEMO Network Outage Scheduler (NOS) for further details.
Mya San
AEMO Operations
70645GENERAL NOTICE22/10/2019 11:43:33 AM
Reduction in load relief for mainland regions - 24 October 2019
AEMO ELECTRICITY MARKET NOTICE
Refer to market notice 69914 and 70206 and 70441
On 24th October at 1100hrs AEMO will reduce the load relief used in the FCAS constraint equations from 1.2% to 1.1% for all mainland regions. This will increase the amount of contingency FCAS enabled by AEMO.
This change is a part of AEMO's review of frequency in the NEM. The mainland load relief will be slowly reduced. Details were provided to market participants in an industry teleconference on 16 August 2019. For more information refer to: https://www.aemo.com.au/Electricity/National-Electricity-Market-NEM/Security-and-reliability/Ancillary-services/Load-relief
There will be no change at this stage to the Tasmanian load relief.
The next change is planned for 7th November 2019.
Mahsa Ahmadi
AEMO Operations
Refer to market notice 69914 and 70206 and 70441
On 24th October at 1100hrs AEMO will reduce the load relief used in the FCAS constraint equations from 1.2% to 1.1% for all mainland regions. This will increase the amount of contingency FCAS enabled by AEMO.
This change is a part of AEMO's review of frequency in the NEM. The mainland load relief will be slowly reduced. Details were provided to market participants in an industry teleconference on 16 August 2019. For more information refer to: https://www.aemo.com.au/Electricity/National-Electricity-Market-NEM/Security-and-reliability/Ancillary-services/Load-relief
There will be no change at this stage to the Tasmanian load relief.
The next change is planned for 7th November 2019.
Mahsa Ahmadi
AEMO Operations
70588GENERAL NOTICE18/10/2019 03:07:37 PM
Daily planned outage of Moorabool - Tarrone 500 kV line in the Victoria region from 4 to 6 November 2019
AEMO ELECTRICITY MARKET NOTICE
The Moorabool - Tarrone 500 kV line in the Victoria (VIC) region is planned to be out of service from 0600 hrs to 1600 hrs on the following dates:
-04/11/2019
-05/11/2019
-06/11/2019
A credible contingency event during this planned outage could cause synchronous separation of the South Australia (SA) region from the rest of the NEM. If separation occurs, load may be interrupted due to the operation of the Automatic Under Frequency Load Shedding (AUFLS) scheme in SA.
The credible separation contingency is managed as follows:
- When power transfer is from SA to Victoria, contingency lower FCAS will be sourced from SA.
- When power transfer is from Victoria to SA, due to the 47-52Hz island separation frequency band advised by the SA jurisdiction, contingency raise FCAS is not sourced in SA and the AUFLS scheme may respond to low frequency events.
- Power transfer will be restricted on Victoria - South Australia interconnector (Heywood interconnector) to manage system security following the loss of the next contingency.
Forecast capacity reserves in the SA region are currently sufficient to meet electricity demand during the planned outage.
The following constraint sets have been invoked for this outage:
I-VS_050
S-X_BC_CP
V-MLTR
Refer AEMO Network Outage Schedule (NOS) for further details.
Mya San
AEMO Operations
The Moorabool - Tarrone 500 kV line in the Victoria (VIC) region is planned to be out of service from 0600 hrs to 1600 hrs on the following dates:
-04/11/2019
-05/11/2019
-06/11/2019
A credible contingency event during this planned outage could cause synchronous separation of the South Australia (SA) region from the rest of the NEM. If separation occurs, load may be interrupted due to the operation of the Automatic Under Frequency Load Shedding (AUFLS) scheme in SA.
The credible separation contingency is managed as follows:
- When power transfer is from SA to Victoria, contingency lower FCAS will be sourced from SA.
- When power transfer is from Victoria to SA, due to the 47-52Hz island separation frequency band advised by the SA jurisdiction, contingency raise FCAS is not sourced in SA and the AUFLS scheme may respond to low frequency events.
- Power transfer will be restricted on Victoria - South Australia interconnector (Heywood interconnector) to manage system security following the loss of the next contingency.
Forecast capacity reserves in the SA region are currently sufficient to meet electricity demand during the planned outage.
The following constraint sets have been invoked for this outage:
I-VS_050
S-X_BC_CP
V-MLTR
Refer AEMO Network Outage Schedule (NOS) for further details.
Mya San
AEMO Operations
70441GENERAL NOTICE08/10/2019 09:26:34 AM
Reduction in load relief for mainland regions - 10 October 2019
AEMO ELECTRICITY MARKET NOTICE
Refer to market notice 69914 and 70206
On 10th October at 1100hrs AEMO will reduce the load relief used in the FCAS constraint equations from 1.3% to 1.2% for all mainland regions. This will increase the amount of contingency FCAS enabled by AEMO.
This change is a part of AEMO's review of frequency in the NEM. The mainland load relief will be slowly reduced. Details were provided to market participants in an industry teleconference on 16 August 2019. For more information refer to: https://www.aemo.com.au/Electricity/National-Electricity-Market-NEM/Security-and-reliability/Ancillary-services/Load-relief
There will be no change at this stage to the Tasmanian load relief.
The next change is planned for 24th October 2019.
Terry Liu
AEMO Operations
Refer to market notice 69914 and 70206
On 10th October at 1100hrs AEMO will reduce the load relief used in the FCAS constraint equations from 1.3% to 1.2% for all mainland regions. This will increase the amount of contingency FCAS enabled by AEMO.
This change is a part of AEMO's review of frequency in the NEM. The mainland load relief will be slowly reduced. Details were provided to market participants in an industry teleconference on 16 August 2019. For more information refer to: https://www.aemo.com.au/Electricity/National-Electricity-Market-NEM/Security-and-reliability/Ancillary-services/Load-relief
There will be no change at this stage to the Tasmanian load relief.
The next change is planned for 24th October 2019.
Terry Liu
AEMO Operations
70419GENERAL NOTICE06/10/2019 05:10:31 PM
Update - Lightning vulnerable lines in Tas region
AEMO ELECTRICITY MARKET NOTICE
Update - Lightning vulnerable lines in Tas region
At 1300 hrs 06/10/2019 the Lindisfarne - Sorrell and the Lindisfarne - Sorrell _ Triabunna_Tee 110kV lines tripped.
The cause of the trip was identified as due to lightning.
In accordance with SO_OP_3715 section 11, AEMO now considers the Lindisfarne - Sorrell and the Lindisfarne - Sorrell _ Triabunna_Tee 110kV lines to be vulnerable with a category of probable due to lightning.
Manager NEM Real Time Operations
Update - Lightning vulnerable lines in Tas region
At 1300 hrs 06/10/2019 the Lindisfarne - Sorrell and the Lindisfarne - Sorrell _ Triabunna_Tee 110kV lines tripped.
The cause of the trip was identified as due to lightning.
In accordance with SO_OP_3715 section 11, AEMO now considers the Lindisfarne - Sorrell and the Lindisfarne - Sorrell _ Triabunna_Tee 110kV lines to be vulnerable with a category of probable due to lightning.
Manager NEM Real Time Operations
70371GENERAL NOTICE04/10/2019 12:57:52 PM
Update to Moorabool - Tarrone 500 kV transmission line outage on the 5, 6, 7 and 8 Oct 2019
The Moorabool (MLTS) - Tarrone (TRTS) 500 kV line was planned to be out of service from 0630 hrs to 1800 hrs on the 5, 6, 7, 8 Oct 2019. Refer to Market Notice 69291 for more information.
The outages have now been rescheduled as follows:
5/10/2019 07:00 to 17:00
6/10/2019 06:00 to 16:00
7/10/2019 05:00 to 19:00
8/10/2019 05:00 to 19:00
A credible contingency event during this planned outage could cause synchronous separation of the South Australia (SA) region from the rest of the NEM. If separation occurs, load may be interrupted due to the operation of the Automatic Under Frequency Load Shedding (AUFLS) scheme in SA.
The credible separation contingency is managed as follows:
- When power transfer is from SA to Victoria, contingency lower FCAS will be sourced from SA.
- When power transfer is from Victoria to SA, due to the 47-52Hz island separation frequency band advised by the SA jurisdiction, contingency raise FCAS is not sourced in SA and the AUFLS scheme may respond to low frequency events.
- Power transfer will be restricted on Victoria - South Australia interconnector (Heywood interconnector) to manage system security following the loss of the next contingency.
Forecast capacity reserves in the SA region are currently sufficient to meet electricity demand during the planned outage.
The following constraint sets have been invoked for this outage:
I-VS_050
S-X_BC_CP
V-MLTR
Refer AEMO Network Outage Schedule (NOS) for further details.
Kiet Lee
AEMO Operations
The outages have now been rescheduled as follows:
5/10/2019 07:00 to 17:00
6/10/2019 06:00 to 16:00
7/10/2019 05:00 to 19:00
8/10/2019 05:00 to 19:00
A credible contingency event during this planned outage could cause synchronous separation of the South Australia (SA) region from the rest of the NEM. If separation occurs, load may be interrupted due to the operation of the Automatic Under Frequency Load Shedding (AUFLS) scheme in SA.
The credible separation contingency is managed as follows:
- When power transfer is from SA to Victoria, contingency lower FCAS will be sourced from SA.
- When power transfer is from Victoria to SA, due to the 47-52Hz island separation frequency band advised by the SA jurisdiction, contingency raise FCAS is not sourced in SA and the AUFLS scheme may respond to low frequency events.
- Power transfer will be restricted on Victoria - South Australia interconnector (Heywood interconnector) to manage system security following the loss of the next contingency.
Forecast capacity reserves in the SA region are currently sufficient to meet electricity demand during the planned outage.
The following constraint sets have been invoked for this outage:
I-VS_050
S-X_BC_CP
V-MLTR
Refer AEMO Network Outage Schedule (NOS) for further details.
Kiet Lee
AEMO Operations