System frequency during simultaneous trips at YWPS3 and YWPS4 on Thursday 16th October 2025

Posted by Linton CorbetThursday 16th October 2025  3:41 PM   Topic: 2025-10-16

Following Simultaneous trips at YWPS3 and YWPS4 on Thursday 16th October 2025 we briefly inspect system frequency using the Global-Roam high speed logger.

Frequency dropped in association with the trips but remained within the NOFB.

The trips amounted to a coincident loss of almost 600 MW of supply.

 

The rate of change of frequency over a 500ms period was determined to be -0.07 Hz. Combined with the decline to only 49.9 Hz the impact on frequency seems to have been well mitigated.

 

 

 

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About the Author

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Linton Corbet
Linton is a Senior Software Engineer and Market Analyst, who joined Global-Roam in August 2020. Before joining the company, Linton worked at the Australian Energy Market Operator (AEMO) for seven years, including four years as an analyst within their demand forecasting team. Before entering the energy sector, he worked as an air quality scientist in the Czech Republic.

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Allan O'Neil Fri 20th April 2018 

When the NEM’s Largest Generating Unit Trips …

A follow-on to my earlier article of a couple weeks ago, looking at another instance where a team effort was required to counter a drop in system frequency following the loss of generation at a large power station (this time the single unit Kogan Creek power station – the largest single unit in the NEM).

3 Trackbacks & Pingbacks

  1. Weakness in frequency stability on Thursday afternoon 16th October 2025 - WattClarity
  2. Peeling the second layer of the onion, with respect to the (SemiSched-induced) frequency weakness on Thursday 16th October 2025 - WattClarity
  3. Selected 4-second data relating to the (SemiSched-induced) frequency weakness on Thursday 16th October 2025 (i.e. Part 4) - WattClarity

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