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60537POWER SYSTEM EVENTS01/01/2018 11:44:52 PM
Update Non-credible contingency event - Queensland region - Monday, 1 January 2018
AEMO ELECTRICITY MARKET NOTICE
Update Non-credible contingency event - Queensland region - Monday, 1 January 2018
Refer to AEMO Electricity Market Notice 60534
At 2020 hrs the following Transmission equipment tripped in the Queensland region.
T22 Callide - T152 Gladstone South 7105 132 kV Transmission line
T152 Gladstone South No3 132 kV Busbar
T152 Gladstone South - T19 Gladstone South 7268 Transmission line.
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.
Manager NEM Real Time Operations
Update Non-credible contingency event - Queensland region - Monday, 1 January 2018
Refer to AEMO Electricity Market Notice 60534
At 2020 hrs the following Transmission equipment tripped in the Queensland region.
T22 Callide - T152 Gladstone South 7105 132 kV Transmission line
T152 Gladstone South No3 132 kV Busbar
T152 Gladstone South - T19 Gladstone South 7268 Transmission line.
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.
Manager NEM Real Time Operations
60534POWER SYSTEM EVENTS01/01/2018 09:19:13 PM
Non-credible contingency event - Queensland region - Monday, 1 January 2018
AEMO ELECTRICITY MARKET NOTICE
Non-credible contingency event - Queensland region - Monday, 1 January 2018
At 2020 hrs the T152 Gladstone South No3 132 kV Busbar and the T152 Gladstone South -T19 Gladstone South 7268 132 kV line tripped.
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 - Monday, 1 January 2018
At 2020 hrs the T152 Gladstone South No3 132 kV Busbar and the T152 Gladstone South -T19 Gladstone South 7268 132 kV line tripped.
The cause of this non credible contingency event is not known at this stage.
Manager NEM Real Time Operations
60160POWER SYSTEM EVENTS30/11/2017 09:34:13 PM
Reclassification of a Non Credible Contingency Event: Bungama - Blyth West 275 kV Line and Snowtown WF Stage 2 Nth and Sth windfarms in SA region.
AEMO ELECTRICITY MARKET NOTICE
Refer previous AEMO market notices 59998 and 60159
Reclassification of a Non Credible Contingency Event: Bungama - Blyth West 275 kV Line and Snowtown WF Stage 2 Nth and Sth windfarms in SA region.
Based on advice from the TNSP, the simultaneous trip of Bungama - Blyth West 275 kV Line and Snowtown WF Stage 2 Nth and Sth windfarms are now considered credible.
AEMO has reclassified the simultaneous trip of the Bungama - Blyth West 275 kV Line and the Snowtown WF Stage 2 Nth and Sth windfarms to be a credible contingency event from 2115 hrs 30/11/2017 until further notice.
Manager NEM Real Time Operations
Refer previous AEMO market notices 59998 and 60159
Reclassification of a Non Credible Contingency Event: Bungama - Blyth West 275 kV Line and Snowtown WF Stage 2 Nth and Sth windfarms in SA region.
Based on advice from the TNSP, the simultaneous trip of Bungama - Blyth West 275 kV Line and Snowtown WF Stage 2 Nth and Sth windfarms are now considered credible.
AEMO has reclassified the simultaneous trip of the Bungama - Blyth West 275 kV Line and the Snowtown WF Stage 2 Nth and Sth windfarms to be a credible contingency event from 2115 hrs 30/11/2017 until further notice.
Manager NEM Real Time Operations
59904POWER SYSTEM EVENTS15/11/2017 03:23:28 PM
Non-credible contingency event - NSW region - Wednesday, 15 November 2017
AEMO ELECTRICITY MARKET NOTICE
Non-credible contingency event - NSW region - Wednesday, 15 November 2017
At 1450 hrs the - Newcastle - Eraring 93 330 kV line opened at Eraring end only.
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
Non-credible contingency event - NSW region - Wednesday, 15 November 2017
At 1450 hrs the - Newcastle - Eraring 93 330 kV line opened at Eraring end only.
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
59751POWER SYSTEM EVENTS31/10/2017 06:46:36 PM
Non-credible contingency event - QLD region - 31/10/17
AEMO ELECTRICITY MARKET NOTICE
Non-credible contingency event - QLD region - 31/10/17
At 1817 hrs the T38 Mackay - T141 Pioneer Valley No. 7451 132kV line and and the T38 Mackay No. 3 132/33kv Transformer tripped.
Simultaneously with this event AEMO has observed a reduction in the electrical demand in the Mackay region of approximately 62MW.
AEMO did not instruct load shedding.
The cause of this non credible contingency event is not known at this stage.
Manager NEM Real Time Operations
Non-credible contingency event - QLD region - 31/10/17
At 1817 hrs the T38 Mackay - T141 Pioneer Valley No. 7451 132kV line and and the T38 Mackay No. 3 132/33kv Transformer tripped.
Simultaneously with this event AEMO has observed a reduction in the electrical demand in the Mackay region of approximately 62MW.
AEMO did not instruct load shedding.
The cause of this non credible contingency event is not known at this stage.
Manager NEM Real Time Operations
59608POWER SYSTEM EVENTS26/10/2017 02:07:46 AM
Update - Non-credible contingency event - Vic region - 24/10/17
AEMO ELECTRICITY MARKET NOTICE
Refer AEMO Electricity Market Notice 59597 and 59599
At 2158 hrs 25/10/17 the Heywood - APD No. 2 500 kV Line and the APD No. 1 500 kV Bus 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
Refer AEMO Electricity Market Notice 59597 and 59599
At 2158 hrs 25/10/17 the Heywood - APD No. 2 500 kV Line and the APD No. 1 500 kV Bus 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
59597POWER SYSTEM EVENTS24/10/2017 06:51:49 PM
Non-credible contingency event - Vic region - 24/10/17
AEMO ELECTRICITY MARKET NOTICE
Non-credible contingency event - Vic region - 24/10/17
At 1812 hrs the Heywood - Mortlake - APD No. 2 500 kV Line and the APD No. 1 500 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 is not known at this stage.
Manager NEM Real Time Operations
Non-credible contingency event - Vic region - 24/10/17
At 1812 hrs the Heywood - Mortlake - APD No. 2 500 kV Line and the APD No. 1 500 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 is not known at this stage.
Manager NEM Real Time Operations
59591POWER SYSTEM EVENTS24/10/2017 04:18:27 PM
Non-Credible Contingency Event - Mudgeeraba 110 kV Bus - Qld region - 24th Oct 2017
AEMO ELECTRICITY MARKET NOTICE
Non-credible Contingency Event - Mudgeeraba 110 kV Bus - Qld region - 24th Oct 2017
At 1511 hrs the Mudgeeraba No. 2 and No. 4 110 kV Buses tripped.
This resulted in the following network elements either being offloaded or de-energised;
757 Terranora - Mudgeeraba
758 Terranora - Mudgeeraba
794 Mudgeeraba - Robina
779 Mudgeeraba - Merrimac
780 Mudgeeraba - Merrimac
706 Mudgeeraba - Nerang
754 Mudgeeraba - Burleigh
F838 Mudgeeraba - Varsity Lakes
755 Mudgeeraba - Burleigh
F839 Mudgeeraba - Varsitry Lakes
Mudgeeraba 4T 110/33 kV Transformer
Mudgeeraba 3T 275/110 kV Transformer
Mudgeeraba 5T 275/110 kV Transformer
Subsequently, Directlink cables DC1and DC2 tripped.
AEMO did not instruct load shedding.
AEMO was advised of disconnection of bulk electrical load of approx. 100 MW
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.
The following Constraint sets were invoked:
I-TE_ZERO
N-X_MBTE_3
At 1541 the Mudgeeraba No. 2 and No. 4 110 kV Buses were restored.
Manager NEM Real Time Operations
Non-credible Contingency Event - Mudgeeraba 110 kV Bus - Qld region - 24th Oct 2017
At 1511 hrs the Mudgeeraba No. 2 and No. 4 110 kV Buses tripped.
This resulted in the following network elements either being offloaded or de-energised;
757 Terranora - Mudgeeraba
758 Terranora - Mudgeeraba
794 Mudgeeraba - Robina
779 Mudgeeraba - Merrimac
780 Mudgeeraba - Merrimac
706 Mudgeeraba - Nerang
754 Mudgeeraba - Burleigh
F838 Mudgeeraba - Varsity Lakes
755 Mudgeeraba - Burleigh
F839 Mudgeeraba - Varsitry Lakes
Mudgeeraba 4T 110/33 kV Transformer
Mudgeeraba 3T 275/110 kV Transformer
Mudgeeraba 5T 275/110 kV Transformer
Subsequently, Directlink cables DC1and DC2 tripped.
AEMO did not instruct load shedding.
AEMO was advised of disconnection of bulk electrical load of approx. 100 MW
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.
The following Constraint sets were invoked:
I-TE_ZERO
N-X_MBTE_3
At 1541 the Mudgeeraba No. 2 and No. 4 110 kV Buses were restored.
Manager NEM Real Time Operations
59394POWER SYSTEM EVENTS09/10/2017 12:08:42 PM
Non-credible contingency event - South Australia region - 09/10/17
AEMO ELECTRICITY MARKET NOTICE
Non-credible contingency event - South Australia region - 09/10/17
At 1153 hrs the Davenport 275kV West 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
Non-credible contingency event - South Australia region - 09/10/17
At 1153 hrs the Davenport 275kV West 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