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56990POWER SYSTEM EVENTS23/01/2017 02:38:07 PM
Update - Non-credible contingency event - Vic region - 23/01/17
AEMO ELECTRICITY MARKET NOTICE
Update - Non-credible contingency event - Vic region - 23/01/17
Update to MN 56988
At Heywood terminal station the SESS No2 Line /M2 Transformer 275kV circuit breaker opened automatically at 0731 hrs. This off loaded the HYTS 500/275 kV M2 transformer.
At 1425 hrs the SESS No2 Line /M2 Transformer 275kV circuit breaker at Heywood terminal station 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.
The following constraint set were revoked at 1435 hrs.
S-X_BC_CP
V-HYTX_M12
The Constraint Sets contain equations with the following interconnectors on the LHS.
V-S-MNSP1
V-SA
Manager NEM Real Time Operations
Update - Non-credible contingency event - Vic region - 23/01/17
Update to MN 56988
At Heywood terminal station the SESS No2 Line /M2 Transformer 275kV circuit breaker opened automatically at 0731 hrs. This off loaded the HYTS 500/275 kV M2 transformer.
At 1425 hrs the SESS No2 Line /M2 Transformer 275kV circuit breaker at Heywood terminal station 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.
The following constraint set were revoked at 1435 hrs.
S-X_BC_CP
V-HYTX_M12
The Constraint Sets contain equations with the following interconnectors on the LHS.
V-S-MNSP1
V-SA
Manager NEM Real Time Operations
56988POWER SYSTEM EVENTS23/01/2017 08:44:03 AM
Non-credible contingency event - Vic region - 23/01/17
AEMO ELECTRICITY MARKET NOTICE
Non-credible contingency event - Vic region - 23/01/17
At 0731 hrs at Heywood 500kV terminal station the SESS No2 Line /M2 transformer CB opened.
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.
Refer to AEMO Network Outage Scheduler (NOS) for further details.
Manager NEM Real Time Operations
Non-credible contingency event - Vic region - 23/01/17
At 0731 hrs at Heywood 500kV terminal station the SESS No2 Line /M2 transformer CB opened.
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.
Refer to AEMO Network Outage Scheduler (NOS) for further details.
Manager NEM Real Time Operations
56484POWER SYSTEM EVENTS28/12/2016 02:37:51 PM
Non-credible contingency event - New South Wales region
AEMO ELECTRICITY MARKET NOTICE
Non-credible contingency event - New South Wales region
At 1354 hrs 28/12/2016 the 96 Newcastle to Waratah West 330 kV line tripped and automatically reclosed at the Newcastle 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
Non-credible contingency event - New South Wales region
At 1354 hrs 28/12/2016 the 96 Newcastle to Waratah West 330 kV line tripped and automatically reclosed at the Newcastle 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
56425POWER SYSTEM EVENTS24/12/2016 12:22:56 AM
Update - Non-credible contingency event - Queensland region - Friday, 23 December 2016
AEMO ELECTRICITY MARKET NOTICE
Update - Non-credible contingency event - Queensland region - Friday, 23 December 2016
Update to market notice 56423
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
Update - Non-credible contingency event - Queensland region - Friday, 23 December 2016
Update to market notice 56423
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
56423POWER SYSTEM EVENTS23/12/2016 10:59:34 PM
Non-credible contingency event - Queensland region - Friday, 23 December 2016
AEMO ELECTRICITY MARKET NOTICE
Non-credible contingency event - Queensland region - Friday, 23 December 2016
Innsfail No1 132 kV Busbar tripped at 2247 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 is not known at this stage.
Manager NEM Real Time Operations
Non-credible contingency event - Queensland region - Friday, 23 December 2016
Innsfail No1 132 kV Busbar tripped at 2247 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 is not known at this stage.
Manager NEM Real Time Operations
56359POWER SYSTEM EVENTS20/12/2016 11:05:26 AM
Update - Non-credible contingency events- Tas region - 20/12/16
AEMO ELECTRICITY MARKET NOTICE
Update - Non-credible contingency events - Tas region - 20/12/16
This market notice provides an update to two non-credible contingency events that occurred in the Tasmania region on 20/12/16.
At 0933 hrs the Sheffield - George Town No. 1 and No. 2 220 kV Lines tripped simultaneously (refer to market notice 56344).
At 0939 hrs Wilmot, Lemonthyme, Cethana, Devils Gate, Fisher and Rowallan generating units tripped (refer to market notice 56357).
The cause of these two non-credible contingency events has been identified and AEMO is satisfied that another occurrence of these events is unlikely under the current circumstances.
AEMO will not reclassify these events as a credible contingency events.
Manager NEM Real Time Operations
Update - Non-credible contingency events - Tas region - 20/12/16
This market notice provides an update to two non-credible contingency events that occurred in the Tasmania region on 20/12/16.
At 0933 hrs the Sheffield - George Town No. 1 and No. 2 220 kV Lines tripped simultaneously (refer to market notice 56344).
At 0939 hrs Wilmot, Lemonthyme, Cethana, Devils Gate, Fisher and Rowallan generating units tripped (refer to market notice 56357).
The cause of these two non-credible contingency events has been identified and AEMO is satisfied that another occurrence of these events is unlikely under the current circumstances.
AEMO will not reclassify these events as a credible contingency events.
Manager NEM Real Time Operations
56357POWER SYSTEM EVENTS20/12/2016 10:22:05 AM
Update - Non-credible contingency event - Tas region - 20/12/16
AEMO ELECTRICITY MARKET NOTICE
Update - Non-credible contingency event - Tas region - 20/12/16
In addition to the non-credible contingency event at 0933 hrs (refer to market notice 56344), there was a further non-credible contingency event at 0939 hrs as described below.
At 0939 hrs the following generation tripped in the Tasmania region
Wilmot, Lemonthyme, Cethana, Devils Gate, Fisher and Rowallan
At approximately the same time there was approximately 170 MW of major industrial load reduction.
The cause of this non credible contingency event is not known at this stage.
AEMO did not instruct load shedding.
Manager NEM Real Time Operations
Update - Non-credible contingency event - Tas region - 20/12/16
In addition to the non-credible contingency event at 0933 hrs (refer to market notice 56344), there was a further non-credible contingency event at 0939 hrs as described below.
At 0939 hrs the following generation tripped in the Tasmania region
Wilmot, Lemonthyme, Cethana, Devils Gate, Fisher and Rowallan
At approximately the same time there was approximately 170 MW of major industrial load reduction.
The cause of this non credible contingency event is not known at this stage.
AEMO did not instruct load shedding.
Manager NEM Real Time Operations
56344POWER SYSTEM EVENTS20/12/2016 09:44:45 AM
Non-credible contingency event - Tas region - 20/12/16
AEMO ELECTRICITY MARKET NOTICE
Non-credible contingency event - Tas region - 20/12/16
At 0933 hrs the Sheffield - George Town No. 1 and No. 2 220 kV Lines tripped simultaneously.
The cause of this non credible contingency event is not known at this stage.
AEMO did not instruct load shedding.
Manager NEM Real Time Operations
Non-credible contingency event - Tas region - 20/12/16
At 0933 hrs the Sheffield - George Town No. 1 and No. 2 220 kV Lines tripped simultaneously.
The cause of this non credible contingency event is not known at this stage.
AEMO did not instruct load shedding.
Manager NEM Real Time Operations
56339POWER SYSTEM EVENTS20/12/2016 08:01:44 AM
Non-credible contingency event - Vic region - 20/12/16
AEMO ELECTRICITY MARKET NOTICE
Non-credible contingency event - Vic region - 20/12/16
At 0738 hrs the Eildon Mount Beauty No. 1 and No. 2 220 kV Lines tripped simultaneously. There is lightning occurring in the vicinity of these lines.
AEMO did not instruct load shedding.
AEMO has not been advised of any disconnection of bulk electrical load.
Manager NEM Real Time Operations
Non-credible contingency event - Vic region - 20/12/16
At 0738 hrs the Eildon Mount Beauty No. 1 and No. 2 220 kV Lines tripped simultaneously. There is lightning occurring in the vicinity of these lines.
AEMO did not instruct load shedding.
AEMO has not been advised of any disconnection of bulk electrical load.
Manager NEM Real Time Operations