Market Notices

78078RECLASSIFY CONTINGENCY21/09/2020 08:35:35 AM

Reclassification of a Non-Credible Contingency Event: Eildon PS - Mt Beauty No.1 220 kV line and Eildon PS - Mt Beauty No.2 220 kV line in VIC1 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: VIC1

Lines: Eildon PS - Mt Beauty No.1 220 kV and Eildon PS - Mt Beauty No.2 220 kV

Duration: 21/09/2020 08:35 until further notice

Constraint set(s) invoked:
NONE

Auto-generated on behalf of Manager NEM Real Time Operations
     
78077RECLASSIFY CONTINGENCY21/09/2020 07:28:19 AM

Reclassification of a Non-Credible Contingency Event: Hazelwood - Rowville No.1 220kV line and Hazelwood - Rowville No.2 220kV line in VIC1 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: VIC1

Lines: Hazelwood - Rowville No.1 220kV and Hazelwood - Rowville No.2 220kV

Duration: 21/09/2020 07:28 until further notice

Constraint set(s) invoked:
V-HWRO_R_N-2 Constraint set contains the following interconnector(s) on the left hand side:
NONE


Auto-generated on behalf of Manager NEM Real Time Operations
     
78076INTER-REGIONAL TRANSFER21/09/2020 06:43:24 AM

Cancellation - Inter-regional transfer limit variation: Hazelwood - South Morang No.1 500 kV Line (Vic) - Voltage Control

AEMO ELECTRICITY MARKET NOTICE

Cancellation - Inter-regional transfer limit variation: Hazelwood - South Morang No.1 500 kV Line (Vic) - Voltage Control

Refer AEMO Electricity Market Notice 78052

The Hazelwood - South Morang No.1 500 kV Line has been returned to service.

The following constraint set was revoked at 0645 hrs


V-HWSM

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

T-V-MNSP1
V-S-MNSP1
V-SA
VIC1-NSW1

Manager NEM Real Time Operations
     
78075MARKET INTERVENTION21/09/2020 02:39:38 AM

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 0200 hrs 22/09/2020 to 1630 hrs 22/09/2020 are inadequate to maintain sufficient system strength in SA and hence a secure operating state.

AEMO currently estimates that, 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.
If necessary, AEMO will estimate and publish the latest time at which AEMO would need to intervene after the 1230 hrs predispatch run on the 21/09/2020.

Manager NEM Real Time Operations
     
78074RECLASSIFY CONTINGENCY20/09/2020 10:45:25 PM

Cancellation of the reclassification of a Non-Credible Contingency Event: Brinkworth-Davenport, Brinkworth-Templers West and Para-Templers West 275kV lines in SA due to severe weather warning.


AEMO ELECTRICITY MARKET NOTICE.

Cancellation of the reclassification of a non-credible contingency event as a credible contingency event due to severe weather warning.

AEMO considers the simultaneous trip of the following circuits is no longer reasonably possible. There is no longer any severe weather warning in the vicinity of the following lines. Accordingly, its classification has reverted to a non-credible contingency event.

Region: SA

Lines: Brinkworth-Davenport, Brinkworth-Templers West and Para-Templers West 275kV lines

Cancellation time: 2240 hrs 20/09/2020

Constraint set(s) revoked: Nil

Refer AEMO Electricity Market Notice 78065

Manager NEM Real Time Operations
     
78072RECLASSIFY CONTINGENCY20/09/2020 08:47:27 PM

Cancellation of the reclassification of a Non-Credible Contingency Event: Para-Templers West and Magill-Torrens Island A 275kV lines in SA due to severe weather warning.

AEMO ELECTRICITY MARKET NOTICE.

Cancellation of the reclassification of a non-credible contingency event as a credible contingency event due to severe weather warning.

AEMO considers the simultaneous trip of the following circuits is no longer reasonably possible. There is no longer any severe weather warning in the vicinity of the following lines. Accordingly, its classification has reverted to a non-credible contingency event.

Region: SA

Lines: Para-Templers West and Magill-Torrens Island A 275kV lines

Cancellation time: 2014 hrs 20/09/2020
Constraint set(s) revoked: Nil

Refer AEMO Electricity Market Notice 78066

Manager NEM Real Time Operations
     
78071RECLASSIFY CONTINGENCY20/09/2020 08:05:35 PM

Update - Non-credible contingency event - SA region - 20/09/2020

AEMO ELECTRICITY MARKET NOTICE.

Refer AEMO ELECTRICITY MARKET NOTICE MN78068

At 1736 hrs the Cherry Gardens - Tailem Bend 275 kV Line tripped and auto-reclosed. At the same time Tailem Bend - Mobilong 132 kV Line tripped and auto-reclosed at the Tailem Bend end only.

The cause of this non credible contingency event is not known at this stage.
AEMO is not satisfied that this non credible event is unlikely to re-occur.
AEMO has therefore reclassified this event as a credible contingency event until further notice.

Manager NEM Real Time Operations
     
78069GENERAL NOTICE20/09/2020 07:19:52 PM

Cancellation - Non-credible contingency event more likely to occur due to existence of abnormal conditions - SA region

AEMO ELECTRICITY MARKET NOTICE.

Abnormal conditions advised in AEMO Electricity Market Notice 78067 have ceased to impact the likelihood of a non-credible event occurring as at 1900 hrs 20/09/2020.

Constraint set I-VS_250 revoked at 1900 hrs.

Manager NEM Real Time Operations
     
78068POWER SYSTEM EVENTS20/09/2020 07:16:00 PM

Non-credible contingency event - SA region - 20/09/2020

AEMO ELECTRICITY MARKET NOTICE.

At 1736 hrs the Cherry Gardens - Tailem Bend 275 kV Line tripped and auto-reclosed (single phase trip). At the same time Tailem Bend - Mobilong 132 kV Line tripped and auto-reclosed (single phase trip) at the Tailem Bend 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
     
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