Market Notices

55737POWER SYSTEM EVENTS15/11/2016 01:02:37 AM

Non-credible contingency event - Queensland region - 14 Nov 2016

AEMO ELECTRICITY MARKET NOTICE

Non-credible contingency event - Queensland region - 14 Nov 2016
At 2034 hrs the Innisfail No2 132 kV bus 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 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

55629POWER SYSTEM EVENTS10/11/2016 05:26:46 PM

Non-credible contingency event - Vic region - 10/11/16

AEMO ELECTRICITY MARKET NOTICE

Non-credible contingency event - Vic region - 10/11/16

At 0953 hrs the Hazelwood - Loy Yang No. 1 500 kV Line tripped at the Hazelwood end only. The line was placed on load at 0956 hrs.

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 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
55582POWER SYSTEM EVENTS08/11/2016 02:55:36 PM

Non-credible contingency event - Multiple Generator trip Qld region - 08/11/2016

AEMO ELECTRICITY MARKET NOTICE

Non-credible contingency event - Multiple Generator trip Qld Region 08/11/2016

A trip of three generators at H48 Braemar2 Power Station occurred at 1407 hrs

Braemar 5 tripped from 153 MW
Braemar 6 tripped from 151 MW
Braemar 7 tripped from 72 MW

The total loss of generation was approximately 376 MW
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 still being investigated.

Manager NEM Real Time Operations
55495POWER SYSTEM EVENTS29/10/2016 06:15:11 PM

Update - Non-credible contingency event - NSW Region - 28 Oct 2016

AEMO ELECTRICITY MARKET NOTICE

Update - Non-credible contingency event - NSW Region - 28 Oct 2016

Refer to MN 55483

At 1400hrs 29/10/16 the Canberra - Williamsdale No.3C 330kV transmission line and the Williamsdale 1 330/132 kV transformer 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
55483POWER SYSTEM EVENTS28/10/2016 07:33:44 AM

Non-credible contingency event - NSW region - 28 Oct 2016

AEMO ELECTRICITY MARKET NOTICE

Non-credible contingency event - NSW region - 28 Oct 2016

At 0543 hrs the Canberra - Williamsdale No.3C 330kV transmission line and the Williamsdale 1 330/132 kV transformer 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
55456POWER SYSTEM EVENTS21/10/2016 09:26:29 PM

Update - Non-credible contingency event - Qld Region - 21 Oct 2016

AEMO ELECTRICITY MARKET NOTICE

Update - Non-credible contingency event - Qld Region - 21 Oct 2016

Refer to MN 55453

At 2101 hrs the Townsville South No 2 132kV Bus was 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
55453POWER SYSTEM EVENTS21/10/2016 02:34:05 PM

Non-credible contingency event - Queensland region 21 October 2016

AEMO ELECTRICITY MARKET NOTICE

Townsville South Number 2 bus trip.

AEMO has become aware of the following circumstance(s) with respect to the power system,

At 1408 hrs the Townsville South Number 2 bus tripped. This disconnected the following feeders:

7303 Townsville South - Mount Stuart 132 kV line
7243 Townsville South - Mount Stuart 132 kV line
7130 Townsville South - Invicta Mill Tee Clare South 132 kV line
7249 Townsville South - Ross 132 kV line
7237 Townsville South - Townsville Zinc 132 kV line

The following constraint sets have been invoked

Q-MSPTS_7243
Q-MSPTS_7303

AEMO did not instruct load shedding.

Simultaneously with this event AEMO has observed a reduction in the electrical demand in the Queensland region of approximately 60 MW.

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

Manager NEM Real Time Operations
55046POWER SYSTEM EVENTS29/09/2016 06:28:32 PM

AEMO advises that a Black system condition in the South Australia region is no longer current.

AEMO ELECTRICITY MARKET NOTICE.
AEMO advises that a Black system condition in the South Australia region is no longer current.

Refer Market notice 54985

AEMO has given clearance to restore the last load block in South Australia.

The Black System condition is lifted at 1825 hrs 29 September 2016.

The Spot Market will continue to be suspended, please refer to AEMO Market notice 55047

Manager NEM Real Time Operations
55029POWER SYSTEM EVENTS29/09/2016 05:42:28 AM

Update to South Australian system black restoration.

AEMO ELECTRICITY MARKET NOTICE.

POWER SYSTEM EVENT

At 1618 hrs Wednesday, 28 September the SA power system separated from the NEM and became black. A very large lightning storm was traveling across the state at the time. Refer MN# 54994
At 0520 hrs the restoration is proceeding with approx. 900 MW restored in the South Australian region - load will continue to be restored and further updates will be given when information becomes available.
Due to potential damage in the north of the state, restoration in this part of the network could be delayed.


Manager NEM Real Time Operations
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