Gordon_R
Honorary Master
Yep, the grid frequency deviation has a nuisance effect, but implies deep underlying issues.
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Europe having grid issues
- Thread starter HavocXphere
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Yep, the grid frequency deviation has a nuisance effect, but implies deep underlying issues.
genetic
Honorary Master
Put a clamp meter to the DB board, and our local supply seems pretty darn close to the benchmark of 50.00Hz;
genetic
Honorary Master
Seems Eskom (obviously) uses an average of 50Hz over time as well;
Gordon_R
Honorary Master
When I grew up in the 1970s we had electric clocks (grid synchronised). They were (mostly) very accurate, over hours and weeks.
Steamy Tom
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Lupus
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44Gw, and it's been as low as 57%, was 70% for 2 months of lockdown but than again planned maintenance was nothing.
genetic
Honorary Master
My microwave's clock runs off the 50Hz electrical supply. It's pretty darn accurate until load-shedding hits, then has to be reset. So no long-term testing...
genetic
Honorary Master
With random testing the supply seems to vary between 49.99Hz and 50.00Hz, but that is obviously due to the inaccuracy of inductive testing. Would need an oscilloscope to accurately measure the results - but then again, Eskom might be running a little high or low depending on average frequency. Not sure how much load-shedding affects these numbers? I'm sure it's pretty high - but there doesn't seem to be much documentation on the synchronization of electrical supply from the national grid down to the local municipal level, and how the systems react when there is an interruption in electrical supply.
Either way it has no bearing on the average user if we keep getting load-shed.
RonSwanson
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Last week in Johannesburg
And the weeks before that:
/wonders if this can be used as a source of randomness for generating secret keys...
And the weeks before that
:/wonders if this can be used as a source of randomness for generating secret keys...
Last edited:
Wut
Executive Member
My bad... I tossed in some microwave popcorn and switched the kettle on.
HavocXphere
Honorary Master
What are you using to capture that?
AxField
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That’s coming off my Goodwe inverter
ToxicBunny
Oi! Leave me out of this...
That's actually not necessarily a bad idea... Or at least use it as one of the inputs for randomness.Last week in Johannesburg
View attachment 990292
And the weeks before that:
View attachment 990294
View attachment 990296
/wonders if this can be used as a source of randomness for generating secret keys...
:
Gordon_R
Honorary Master
Pakistan suffers countrywide blackout. Article mentions frequency instability:
www.bbc.com
Pakistan power cut plunges country into darkness
Electricity is gradually being restored after a huge outage triggered by a power station fault.
www.bbc.com
And how the hell are you going to decrypt the Key again for yourself????Last week in Johannesburg
View attachment 990292
And the weeks before that
View attachment 990294
View attachment 990296
/wonders if this can be used as a source of randomness for generating secret keys...
RonSwanson
Honorary Master
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You use randomness to generate private keys. Also as IVs in most crypto handshakes. Ever played with OpenSSL?
HavocXphere
Honorary Master
Time travel!
nah you know with some key generation programs it asks you to wiggle the mouse for a bit...that's the part he wants to replace. Computers struggle to generate their own "true" randomness because they are by nature deterministic
HavocXphere
Honorary Master
I wonder whether they'll do a write-up of the process to get everything started again i.e. blackstart. Doubtful for pakistan thoughPakistan suffers countrywide blackout. Article mentions frequency instability:
Pakistan power cut plunges country into darkness
Electricity is gradually being restored after a huge outage triggered by a power station fault.