Market Notices

78904POWER SYSTEM EVENTS16/10/2020 01:20:42 PM

Update - Non-credible contingency event - SA region - 16 Oct 2020

AEMO ELECTRICITY MARKET NOTICE.

Update - Non-credible contingency event - SA region - 16 Oct 2020

Refer AEMO ELECTRICITY MARKET NOTICE 78888

At 1229 hrs the Brinkworth - Templers West and the Brinkworth - Davenport 275 kV Lines were returned to 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.

AEMO will not reclassify this event as a credible contingency event.

Manager NEM Real Time Operations
     
78888POWER SYSTEM EVENTS16/10/2020 07:18:01 AM

Non-credible contingency event - SA region - 16 Oct 2020

AEMO ELECTRICITY MARKET NOTICE.

Non-credible contingency event - SA region - 16 Oct 2020

At 0610hrs the Brinkworth - Templers West and the Brinkworth - Davenport 275 kV Lines 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
     
78757POWER SYSTEM EVENTS13/10/2020 02:00:14 PM

Non-credible contingency event - VIC region - 07/10/2020

AEMO ELECTRICITY MARKET NOTICE.

Update - Non-credible contingency event - VIC region - 07/10/2020

At 1704 hrs loss of multiple generating units at Valley Power Gas Station. VPGS Units 1, 2, 3,4,5 and 6 tripped.

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.

AEMO will not reclassify this event as a credible contingency event.

Manager NEM Real Time Operations

     
78598POWER SYSTEM EVENTS07/10/2020 05:49:02 PM

Non-credible contingency event - VIC region - 07/10/2020

AEMO ELECTRICITY MARKET NOTICE.

Non-credible contingency event - VIC region - 07/10/2020

At 1704 hrs loss of multiple generating units at Valley Power Gas Station. VPGS Units 1, 2, 3, 4 , 5 and 6 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 and is under investigation.

Manager NEM Real Time Operations
     
78587POWER SYSTEM EVENTS07/10/2020 03:04:58 PM

Non-credible contingency event - Vic region - 07/10/2020

AEMO ELECTRICITY MARKET NOTICE.

Non-credible contingency event - Vic region - 07/10/2020

At 1321 hrs at Mortlake PS the Blue Gum No1 Line / No. 11 Generator Transformer Circuit Breaker was tripped as part of planned work.
This caused Mortlake No 11 Generator Transformer No 2 Bus 500 kV CB to trip which resulted in Mortlake No 11 Generator trip.

At 1327 hrs both circuits breakers, Blue Gum No1 Line / No. 11 Generator Transformer and Mortlake No 11 Generator Transformer No 2 Bus 500 kV returned to service.

At 1402 hrs Mortlake No 11 Generator returned to service.

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.

AEMO is not satisfied that this non credible event is unlikely to re-occur.

AEMO will therefore reclassified this event as a credible contingency event until further notice.

Manager NEM Real Time Operations
     
78449POWER SYSTEM EVENTS30/09/2020 01:16:54 PM

Non-credible contingency event - Qld region - 30/09/2020

AEMO ELECTRICITY MARKET NOTICE.

Non-credible contingency event - Qld region - 30/09/2020

At 1252 hrs the Mt England - Wivenhoe PS No. 823 275 kV line and the Mt England - Wivenhoe PS No. 824 275 kV line 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
     
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
     
77595POWER SYSTEM EVENTS08/09/2020 10:27:22 AM

Update - Non-credible contingency event - Victoria region - 08/09/2020

AEMO ELECTRICITY MARKET NOTICE.

Refer AEMO ELECTRICITY MARKET NOTICE MN77594

At 1000 hrs the Wodonga No. 1 and No. 2 330kV/66kV transformers returned to 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.

AEMO will not reclassify this event as a credible contingency event.

Manager NEM Real Time Operations
     
77594POWER SYSTEM EVENTS08/09/2020 09:29:54 AM

Non-credible contingency event - Victoria region - 08/09/2020

AEMO ELECTRICITY MARKET NOTICE.

At 0839 hrs the Wodonga No. 1 and No. 2 330 kV bus tripped which offloaded the Dederang - Wodonga 330 kV Line and the Wodonga - Jindera 330 kV Line.
At 0851 hrs the Wodonga No. 1 330 kV bus, the Dederang - Wodonga 330 kV Line and the Wodonga - Jindera 330 kV Line were returned to service.
At 0912 hrs the Wodonga No. 2 330 kV bus was returned to service. The Wodonga No. 1 and No. 2 330kV/66kV transformers remain out of service.

AEMO did not instruct load shedding.

It appears there was approximately 8 MW of load lost at Wodonga, however this amount has not been confirmed.

The cause of this non credible contingency event is not known at this stage.

Manager NEM Real Time Operations

     
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