Market Notices

54640GENERAL NOTICE31/07/2016 07:05:20 AM

Update - Vulnerable Lines in Tasmania Region

AEMO ELECTRICITY MARKET NOTICE

Update - Vulnerable Lines in Tasmania Region
Refer to Market Notice 54639
At 0602 hrs the Farrell - Reece No 1 and the Farrell - Reece No 2 220 kV Lines tripped.
The cause of the trip was identified as due to Lightning.
In accordance with SO_OP_3715 section 11, AEMO now considers the Farrell - Reece No 1 and the Farrell - Reece No 2 220 kV Lines to be vulnerable with a category of probable due to Lightning.

Manager NEM Real Time Operations
54639POWER SYSTEM EVENTS31/07/2016 06:25:53 AM

Non-credible contingency event - Tas Region - 31 July 2016

AEMO ELECTRICITY MARKET NOTICE

Non-credible contingency event - Tas Region - 31 July 2016

At 0602 hrs the Farrell - Reece No 1 and the Farrell - Reece No 2 220 kV Lines tripped.

AEMO did not instruct load shedding.

AEMO has not been advised of any disconnection of bulk electrical load.

AEMO will reclassify this event as a credible contingency event due to lightning

Manager NEM Real Time Operations
54638INTER-REGIONAL TRANSFER31/07/2016 06:16:26 AM

Cancellation- Inter-regional transfer limit variation for VSAT Stability Limit - Tas Region - 31 July 2016

AEMO ELECTRICITY MARKET NOTICE

Cancellation - Inter-regional transfer limit variation for VSAT Stability Limit - Tas Region - 31 July 2016

Refer to MN 54635

The AEMO VSAT application is indicating a return to stable conditions.

The following constraint was invoked to manage the violation of the voltage stability limit.

Constraint I-TV_470 invoked from 0445 hrs to 0620 hrs

Constraint has the following interconnector on the LHS

T-V-MNSP1

Manager NEM Real Time Operations
54637RECLASSIFY CONTINGENCY31/07/2016 05:50:59 AM

Cancellation of the Reclassification of a Non-Credible Contingency Event: Farrell - Sheffield No. 1 and No. 2 220 kV Lines in Tasmania due to Lightning.

AEMO ELECTRICITY MARKET NOTICE

Cancellation of the Reclassification of a Non-Credible Contingency Event: Farrell - Sheffield No. 1 and No. 2 220 kV Lines in Tasmania due to Lightning.

Refer AEMO Electricity Market Notice 54634

There is no longer any lightning activity in the vicinity of the Farrell - Sheffield No. 1 and No. 2 220 kV Lines.

AEMO has cancelled the reclassification of the simultaneous trip of those circuits as a credible contingency event at 0545 hrs.

Constraint Sets Constraint Sets revoked :
F-T-FASH_N-2
F-FASH_N-2_HM_C


Manager NEM Real Time Operations
54636RECLASSIFY CONTINGENCY31/07/2016 05:47:08 AM

Cancellation of the Reclassification of a Non-Credible Contingency Event: Farrell - John Butters 220 kV Line and the Farrell - Rosebery Tee Queenstown - Newton 110 kV Line in Tasmania due to Lightning.

AEMO ELECTRICITY MARKET NOTICE

Cancellation of the Reclassification of a Non-Credible Contingency Event: Farrell - John Butters 220 kV Line and the Farrell - Rosebery Tee Queenstown - Newton 110 kV Line in Tasmania due to Lightning.

Refer AEMO Electricity Market Notice54633

There is no longer any lightning activity in the vicinity of the Farrell - John Butters 220 kV Line and the Farrell - Rosebery Tee Queenstown - Newton 110 kV Line.

AEMO has cancelled the reclassification of the simultaneous trip of those circuits as a credible contingency event at 0545 hrs.


Manager NEM Real Time Operations
54635INTER-REGIONAL TRANSFER31/07/2016 04:44:38 AM

Inter-regional transfer limit variation for VSAT Stability Limit - Tas Region - 31 July 2016

AEMO ELECTRICITY MARKET NOTICE

Inter-regional transfer limit variation for VSAT Stability Limit - Tas Region - 31 July 2016

The AEMO VSAT application is indicating instability across the Tas North to Tas South cutset .

The following constraint has been invoked to manage the violations of the voltage stability limit.

Constraint I-TV_470 nvoked form 0445 hrs until further notice

Constraint has the following interconnector on the LHS

T-V-MNSP1

Manager NEM Real Time Operations
54634RECLASSIFY CONTINGENCY31/07/2016 04:58:49 AM

Reclassification of a Non-Credible Contingency Event: Farrell - Sheffield No. 1 and No. 2 220 kV Lines in Tasmania due to Lightning.

AEMO ELECTRICITY MARKET NOTICE

Reclassification of a Non-Credible Contingency Event: Farrell - Sheffield No. 1 and No. 2 220 kV Lines in Tasmania due to Lightning.
Lightning is occurring near the Farrell - Sheffield No. 1 and No. 2 220 kV Lines.

AEMO considers the simultaneous trip of those circuits to now be more likely.

Therefore AEMO has reclassified this as a credible contingency event from 0500 hrs 31 Jul 2016 until further notice.

Constraint Sets invoked :
F-T-FASH_N-2 invoked
F-FASH_N-2_HM_C

These Constraint Sets contain equations with the following interconnector on the LHS.
T-V-MNSP1

Manager NEM Real Time Operations
54633RECLASSIFY CONTINGENCY31/07/2016 04:12:22 AM

Reclassification of a Non-Credible Contingency Event: Farrell - John Butters 220 kV Line and the Farrell - Rosebery Tee Queenstown - Newton 110 kV Line in Tasmania due to Lightning.

AEMO ELECTRICITY MARKET NOTICE

Reclassification of a Non-Credible Contingency Event: Farrell - John Butters 220 kV Line and the Farrell - Rosebery Tee Queenstown - Newton 110 kV Line in Tasmania due to Lightning.

Lightning is occurring near the Farrell - John Butters 220 kV Line and the Farrell - Rosebery Tee Queenstown - Newton 110 kV Line.

AEMO considers the simultaneous trip of those circuits to now be more likely.
Therefore AEMO has reclassified this as a credible contingency event from 0410 hrs 31/07/2016 until further notice.

Manager NEM Real Time Operations
54632INTER-REGIONAL TRANSFER31/07/2016 02:43:27 AM

Cancellation- Inter-regional transfer limit variation for VSAT Stability Limit - Tas Region - 31 July 2016

AEMO ELECTRICITY MARKET NOTICE

Cancellation - Inter-regional transfer limit variation for VSAT Stability Limit - Tas Region - 31 July 2016

Refer to MN 54631

The AEMO VSAT application is indicating a return to stable conditions.

The following constraint was invoked to manage the violation of the voltage stability limit.

Constraint I-TV_470 invoked from 0110 hrs to 0230 hrs

Constraint has the following interconnector on the LHS

T-V-MNSP1

Manager NEM Real Time Operations
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