Did things sound a little weird at lunch time? It might be because mainland frequency was at 50.2hz.

@xssfox shouldn't that be outside of acceptable frequency bands?

@ShadowJonathan you are correct

@xssfox ?? then how did automatic safety systems not trip? is this a local thing, or was this all over NZ/the grid?

@ShadowJonathan it's complicated. Some systems probably did, but collapsing the grid on high frequency isn't usually a good idea so there's certain thresholds for certain time periods for certain equipment. This in non nominal but most stuff should be able to ride through it. Inverters will probably trip

@xssfox if im reading correctly, it was like this for 30 minutes though, which should be long enough to trip some of these systems, but hmm....

@ShadowJonathan if you want a summary of the targets (the response constraints) https://www.aemc.gov.au/sites/default/files/2024-01/Frequency%20Operating%20Standard.pdf

I imagine most automated over frequency relates are probably set at 52hz