Market Notices

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
     
78067GENERAL NOTICE20/09/2020 05:02:02 PM

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

AEMO ELECTRICITY MARKET NOTICE.

AEMO has identified that a non-credible contingency event is more likely to occur because of the existence of abnormal conditions, namely damaging winds in the South Australia region.

There is a possibility of severe weather impacting multiple transmission elements in its vicinity.

Conditions can change rapidly and potentially impacted plant may change. Further notices will only be published to advise of any reclassification, or when the abnormal conditions have ceased to impact the likelihood of a non-credible event occurring.

Constraint set I-VS_250 invoked at 16:55 20/09/2020 until further notice.


Manager NEM Real Time Operations
     
78066RECLASSIFY CONTINGENCY20/09/2020 05:02:15 PM

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.

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 to now be more likely and reasonably possible. Accordingly AEMO has reclassified it as a credible contingency event.

Region: SA

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

Duration: 20/09/2020 16:55 until further notice
Constraint set(s) invoked: Nil

Manager NEM Real Time Operations
     
78065RECLASSIFY CONTINGENCY20/09/2020 05:01:41 PM

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.

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 to now be more likely and reasonably possible. Accordingly AEMO has reclassified it as a credible contingency event.

Region: SA

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

Duration: 20/09/2020 16:55 until further notice
Constraint set(s) invoked: Nil

Manager NEM Real Time Operations
     
78062MARKET INTERVENTION20/09/2020 01:24:41 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 21/09/2020 to the end of the pre-dispatch period 0400 hrs 22/09/2020 in Pre-dispatch published at 1300 hrs 20/09/2020 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 by 1600 hrs 20/09/2020, 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
     
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