Author Topic: Magic smoke, lots of it  (Read 2200 times)

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Offline PeterLTopic starter

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Magic smoke, lots of it
« on: September 02, 2022, 07:57:27 pm »


Apparently it started with a short in a transformer, after that multiple safety systems failed to cut the power.
 
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Online Gyro

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Re: Magic smoke, lots of it
« Reply #1 on: September 02, 2022, 08:52:10 pm »
That's a really impressive sag on those lines!  :o
Best Regards, Chris
 

Offline Squarewave

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Re: Magic smoke, lots of it
« Reply #2 on: September 04, 2022, 09:29:22 am »
Rifa and Hunts could only dream of that....
 
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Offline srb1954

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Re: Magic smoke, lots of it
« Reply #3 on: September 04, 2022, 12:08:50 pm »
That's a really impressive sag on those lines!  :o
It would be really scary if your house was under those lines and you saw them drooping nearer and nearer to your house.
 

Offline pcprogrammer

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Re: Magic smoke, lots of it
« Reply #4 on: September 04, 2022, 12:21:01 pm »
The text accompanying the video states that a highway (A6) was closed off to allow inspection of the high tension wires. Also all train traffic between the cities Lelystad and Dronten was canceled.

It mentions something about a cable breaking being the cause of it all. I do wonder why the cables started to sag? Just expansion due to heat being generated in them or that they got weakened by the heat and that they need replacement.

Offline Twoflower

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Re: Magic smoke, lots of it
« Reply #5 on: September 05, 2022, 01:27:46 pm »
Everything looks better from above: https://twitter.com/iedeklaas/status/1565738694023303168  :wtf:

A bit further down is a picture of the damage. To me it looks rather small and local. After seeing the video I expected more molten parts around the fireworks.
 

Offline tom66

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Re: Magic smoke, lots of it
« Reply #6 on: September 05, 2022, 01:42:29 pm »
Looks like a fault in the substation caused massive overload of the cables.  You can see them smoking as the dust/dirt burns off the wire.  (Any transmission experts here, do the cables have any treatment applied or are they bare metal?  Maybe the smoke is a varnish burning off?)

Always impressive how much energy a system like this can dissipate in a fault condition. 
 

Offline bsfeechannel

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Re: Magic smoke, lots of it
« Reply #7 on: September 05, 2022, 02:09:56 pm »
Send the video do Big Clive.
 

Online nctnico

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Re: Magic smoke, lots of it
« Reply #8 on: September 05, 2022, 03:14:07 pm »
Looks like a fault in the substation caused massive overload of the cables.  You can see them smoking as the dust/dirt burns off the wire.  (Any transmission experts here, do the cables have any treatment applied or are they bare metal?  Maybe the smoke is a varnish burning off?)

Always impressive how much energy a system like this can dissipate in a fault condition.
Note that what is shown in the video are 'only' 150kV sub-grid wires... I do wonder whether the cables are damaged. AFAIK these are steel enforced aluminium cables. I suppose there will be some kind of grease applied to the cables to avoid fretting damage.

« Last Edit: September 05, 2022, 03:20:38 pm by nctnico »
There are small lies, big lies and then there is what is on the screen of your oscilloscope.
 

Offline Vovk_Z

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Re: Magic smoke, lots of it
« Reply #9 on: September 05, 2022, 07:37:55 pm »
A smoke from wires could be from a heating  dust and some portion of corrosion on a steel part of wires. I'm not sure about any grease applied (I haven't head about any grease applied to those wires).
 

Offline Vovk_Z

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Re: Magic smoke, lots of it
« Reply #10 on: September 05, 2022, 07:45:58 pm »
A relay protection at HV lines is usually arrainged that we usually have a main relay protection and about two reserve protection devices (placed at the opposite end of a line and far away) which overlap each other protection zones. So when something like that happens it means not only main protection (or just a HV breaker) malfunction, but there was a malfunction of a reserve protection (or breaker) at the same time.
It is always an interesting story to hear what coincidence caused all of this.
« Last Edit: September 06, 2022, 10:46:01 pm by Vovk_Z »
 

Offline BradC

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Re: Magic smoke, lots of it
« Reply #11 on: September 06, 2022, 03:10:52 pm »
Note that what is shown in the video are 'only' 150kV sub-grid wires... I do wonder whether the cables are damaged. AFAIK these are steel enforced aluminium cables. I suppose there will be some kind of grease applied to the cables to avoid fretting damage.

Do have any insight into how do they avoid dissimilar metal corrosion?
 

Offline Vovk_Z

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Re: Magic smoke, lots of it
« Reply #12 on: September 06, 2022, 10:47:08 pm »
Aluminum and steel together don't corrode much.
 

Online nctnico

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Re: Magic smoke, lots of it
« Reply #13 on: September 06, 2022, 10:59:38 pm »
In addition: the HV lines sagged so much that they dropped onto the overhead lines of a railroad which then fried all the circuits & switches for that section. Even underground cables that feed the railroad, started to smoke. There will be no trains on that section of raildroad track until next month.
« Last Edit: September 06, 2022, 11:04:40 pm by nctnico »
There are small lies, big lies and then there is what is on the screen of your oscilloscope.
 


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