Naturally, readers might ask: “And what happened to system frequency?”
Our initial inspection indicates there was a very minor impact.
The chart below indicates that frequency dropped to 49.931 Hz. Well within in the lower normal operating frequency band of 49.85 Hz.
The chart also captures the following:
VP5 reduced rather quickly in 2 minutes between 13:38 and 13:40 (time-shifted).
We time-shifted the MW data by -12 seconds to align with the frequency readings.
We don’t typically do this but one expert reader’s advice to us (on an earlier article on Basslink, yet applicable here) suggested that it is appropriate to do so. The measurements are time-stamped when AEMO receives them and the latency in communicating these and other signals can be exacerbated when events occur (more alarms and other things going on).
VP6 dropped to zero at 13:43:36 (time-shifted), about 1 minute and 15 seconds after VP6.
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.
Prompted by a few media questions (on a day when all 4 units were offline together for about 3 hours), have taken a quick look at the status of the four units on the Callide Power Station site.
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