Two units at Vales Point trip simultaneously on Sunday 7th June 2020

Posted by Paul McArdle Sunday, June 7 2020 Topic: Winter 2020 in the NEM

It’s not been a great weekend for Delta Electricity (or Sunset Power’s) Vales Point Power Station:

(A)  Periods of Non-Conformance on Saturday 6th June

On Saturday I noted a couple different periods of Non-Conformance noted for Vales Point unit 5:

1)  The first instance was in the morning (07:15 to 07:20) as noted in Market Notice 75875 – as shown here:

MARKET NOTICE 075875
_________________________________________________________

Notice ID            75875
Notice Type ID        Details of Non-conformance/Conformance
Notice Type Description    MARKET
Issue Date            Saturday, 6 June 2020
External Reference        NON-CONFORMANCE Region NSW1 Saturday, 6 June 2020
_________________________________________________________

AEMO ELECTRICITY MARKET NOTICE

NON-CONFORMANCE NSW1 Region Saturday, 6 June 2020

AEMO declared a schedule generating unit non-conforming

Unit:       VP5
Duration:   06/06/2020 07:15 to 06/06/2020 07:20
Amount:     -64 MW
Constraint: NC-N_VP5

Auto-generated on behalf of Manager NEM Real Time Operations

 2)  The second instance was in the morning (13:55 to 14:00) as noted in Market Notice 75876 – as shown in this snapshot here from the ‘Unit Dashboard’ widget in ez2view:

2020-06-06-at-14-00-ez2view-VP5-NonConforming

 

(B)  Simultaneous trip of both units on Sunday 7th June

Then this afternoon we see both units trip at 13:33 as noted by AEMO in Market Notice 75880:

MARKET NOTICE 075880
_________________________________________________________

 Notice ID            75880
Notice Type ID        Emergency events/conditions
Notice Type Description    MARKET
Issue Date            Sunday, 7 June 2020
External Reference        Non-credible contingency event – NSW region – 07/06/2020
_________________________________________________________

 AEMO ELECTRICITY MARKET NOTICE.

 Non-credible contingency event – NSW region – 07/06/2020

 At 1333 hrs the Vales Pt Unit 5 and the Vales Pt Unit 6 both 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

Here’s a snapshot of the NSW region an hour after the trip, when the Market Notice was published:

2020-06-07-at-14-40-ez2view-ValesPointUnitsTrip

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About the Author

Paul McArdle
Paul was one of the founders of Global-Roam in February 2000. He is currently the CEO of the company and the principal author of WattClarity. Writing for WattClarity has become a natural extension of his work in understanding the electricity market, enabling him to lead the team in developing better software for clients. Before co-founding the company, Paul worked as a Mechanical Engineer for the Queensland Electricity Commission in the early 1990s. He also gained international experience in Japan, the United States, Canada, the UK, and Argentina as part of his ES Cornwall Memorial Scholarship.

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