Market Notices

85194INTER-REGIONAL TRANSFER08/05/2021 04:11:12 PM

Inter-regional transfer limit variation - 964 Line - NSW region - 08/05/2021

AEMO ELECTRICITY MARKET NOTICE

Inter-regional transfer limit variation - 964 Line - NSW region - 08/05/2021

At 1548 hrs 08/05/2021 there was an unplanned outage of Port Macquarie - Taree No. 964 132 kV Line

The following constraint set was invoked from 1555 hrs 08/05/2021.

N-TAPM_964

The constraint set 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
     
85193POWER SYSTEM EVENTS08/05/2021 04:09:27 PM

Non-credible contingency event - NSW region - 08/05/2021

AEMO ELECTRICITY MARKET NOTICE.

Non-credible contingency event - NSW region - 08/05/2021

At 1548 hrs the Port Macquarie - Taree No. 964 132 kV Line tripped at the Taree 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
     
85192MARKET INTERVENTION08/05/2021 02:27:36 PM

Possible intervention to manage power system security in South Australia (SA) Region

AEMO ELECTRICITY MARKET NOTICE

Possible intervention to manage power system security in South Australia (SA) Region

The synchronous generating units expected to be synchronised in SA from 0130 hrs 10/05/2021 to 1500 hrs 10/05/2021 in Pre-dispatch published at 1400 hrs 08/05/2021 are inadequate to maintain sufficient system strength in SA and hence a secure operating state.

In the absence of sufficient market response AEMO may need to intervene by issuing a direction requiring one or more SA synchronous generating unit(s) to operate or remain synchronised to maintain power system security in SA.

Manager NEM Real Time Operations
     
85191INTER-REGIONAL TRANSFER08/05/2021 12:48:49 AM

Inter-regional transfer limit variation: Middle Ridge - Greenbank No 8848 275 kV Line (Qld) - Voltage Control

AEMO ELECTRICITY MARKET NOTICE

Inter-regional transfer limit variation: Middle Ridge - Greenbank No 8848 275 kV Line (Qld) - Voltage Control

Middle Ridge - Greenbank No 8848 275 kV Line has been de-energised to manage voltages in the Queensland region.

The following constraint set was invoked at 0045 hrs 08/05/2021.

Q-MRGB_8848_8849

The constraint set contains equations with the following interconnectors on the LHS.

N-Q-MNSP1
NSW1-QLD1

Refer to AEMO Network Outage Scheduler (NOS) for further details

Manager NEM Real Time Operations
     
85190RECLASSIFY CONTINGENCY07/05/2021 06:19:17 PM

Cancellation of a Non-Credible Contingency Event: Bayswater - Mt Piper No.5A3 500kV line and Wollar - Mt Piper No.5A5 500kV line in NSW1 due to Lightning.

AEMO ELECTRICITY MARKET NOTICE

Cancellation of 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: NSW1

Lines: Bayswater - Mt Piper No.5A3 500kV and Wollar - Mt Piper No.5A5 500kV

Cancellation time: 07/05/2021 18:19

Constraint set(s) revoked:
NONE

Refer AEMO Electricity Market Notice 85189

Auto-generated on behalf of Manager NEM Real Time Operations
     
85189RECLASSIFY CONTINGENCY07/05/2021 05:15:50 PM

Reclassification of a Non-Credible Contingency Event: Bayswater - Mt Piper No.5A3 500kV line and Wollar - Mt Piper No.5A5 500kV line in NSW1 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: NSW1

Lines: Bayswater - Mt Piper No.5A3 500kV and Wollar - Mt Piper No.5A5 500kV

Duration: 07/05/2021 17:15 until further notice

Constraint set(s) invoked:
NONE

Auto-generated on behalf of Manager NEM Real Time Operations
     
85188RECLASSIFY CONTINGENCY07/05/2021 04:59:15 PM

Cancellation of a Non-Credible Contingency Event: Bayswater - Mt Piper No.5A3 500kV line and Wollar - Mt Piper No.5A5 500kV line in NSW1 due to Lightning.

AEMO ELECTRICITY MARKET NOTICE

Cancellation of 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: NSW1

Lines: Bayswater - Mt Piper No.5A3 500kV and Wollar - Mt Piper No.5A5 500kV

Cancellation time: 07/05/2021 16:59

Constraint set(s) revoked:
NONE

Refer AEMO Electricity Market Notice 85187

Auto-generated on behalf of Manager NEM Real Time Operations
     
85187RECLASSIFY CONTINGENCY07/05/2021 03:54:45 PM

Reclassification of a Non-Credible Contingency Event: Bayswater - Mt Piper No.5A3 500kV line and Wollar - Mt Piper No.5A5 500kV line in NSW1 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: NSW1

Lines: Bayswater - Mt Piper No.5A3 500kV and Wollar - Mt Piper No.5A5 500kV

Duration: 07/05/2021 15:54 until further notice

Constraint set(s) invoked:
NONE

Auto-generated on behalf of Manager NEM Real Time Operations
     
85186SETTLEMENTS RESIDUE07/05/2021 03:30:24 PM

[EventId:202105071530_NRM_QLD1_NSW1_stopped] NEGRES CONSTRAINT NRM_QLD1_NSW1 ceased operating from 07 May 2021 15:30

AEMO ELECTRICITY MARKET NOTICE

Issued by Australian Energy Market Operator Ltd at 1530 hrs on 7 May 2021

CANCELLATION - ACTUAL NEGATIVE SETTLEMENT RESIDUES - QLD to NSW - 7 May 2021.

Refer to market notice: 85185

AEMO has ceased taking action to minimize the further accumulation of negative settlement residues on the QLD to NSW directional interconnector.

The negative residue constraint NRM_QLD1_NSW1 ceased operating at 1530 hrs on 7 May 2021.

This is an AEMO autogenerated Market Notice.
     
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