wingnut771
Honorary Master
Probably the 49.7 dip when the **** hit the fan.
-
Join the MyBroadband community
South Africa’s biggest forum. Discuss, discover, and connect with thousands of members.
-
Question of the Day: What is the ultimate French toast topping?
Rolling Blackout Detector (Experiment)
- Thread starter wingnut771
- Start date
wingnut771
Honorary Master
I guess it all boils down to how quick the inverter is measuring. Yours goes down to 49.4. That is really bad.
wingnut771
Honorary Master
So we can speculate that 5:12 was when they tripped.
Lupus
Honorary Master
- Joined
- Apr 25, 2006
- Messages
- 89,386
- Reaction score
- 59,994
probably
wingnut771
Honorary Master
and we can speculate that they tripped because the frequency dropped too low meaning their grid management isn't up to scratch.
Lupus
Honorary Master
- Joined
- Apr 25, 2006
- Messages
- 89,386
- Reaction score
- 59,994
Well actually a dip like that at 05:12 would cause a trip.
wingnut771
Honorary Master
Last edited:
wingnut771
Honorary Master
How can 2 inverters read different?
PsyWulf
Honorary Master
- Joined
- Nov 22, 2006
- Messages
- 20,358
- Reaction score
- 16,003
Exactly what I wanted to highlight for you
All our readings are general, don't expect dead-set accuracy
Their readings might have been 1ms apart for instance,not big enough for a graph but big enough to notice
That said we can Defiinitely see some correlative swings in frequency
wingnut771
Honorary Master
Thanks, are these 2 inverters the same brand model?Exactly what I wanted to highlight for you
All our readings are general, don't expect dead-set accuracy
That said we can Defiinitely see some correlative swings in frequency
PsyWulf
Honorary Master
- Joined
- Nov 22, 2006
- Messages
- 20,358
- Reaction score
- 16,003
They are exact dupes and paralleled,exact same source feeds
See my edit for possible explanation
MrGray
Honorary Master
wingnut771
Honorary Master
Can anyone see (look at thermal generation) where these 5 units tripped, I can't?
Station build-up for the last 7 days - Eskom Data Portal
This shows how resources were used to build-up the demand over the past 7 days, and it includes both generation and demand side resources that Eskom has contracts with.
www.eskom.co.za
Ϲhristopher
Expert Member
- Joined
- Mar 6, 2016
- Messages
- 1,078
- Reaction score
- 811
What are you asking? Demand was met at 04:00, but there was 2GW+ load reduction at 06:00, i.e. they couldn’t ramp up generation to meet demand. The units that went down could have tripped at any time, but supply could still meet demand when they did.
Sideline...They also have filters for high and low frequency
HVDC converter station - Wikipedia
en.m.wikipedia.org
"Beside the harmonic filters, equipment is also provided to eliminate spurious signals in the frequency range of power-line carrier equipment in the range of 30 kHz to 500 kHz. These filters are usually near the alternating current terminal of the static inverter transformer. They consist of a coil which passes the load current, with a parallel capacitor to form a resonant circuit. "
As of 15:14View attachment 1396479
Why would an inverter do this?
Surely use solar much as possible when available and charge battery?
My axpert does the same thing.. Very annoying.
wingnut771
Honorary Master
Look at thermal generation its the same all the time, it's not ramped up, the black part of the graph is thermal excl pumping, so they pump water back overnight lowering the graph.
It looks like they went hard with pumped storage and diesel the day before and ran out as they're about 1GW less on coal:
Here is the day before:
