General > General Technical Chat

Magic smoke, lots of it

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Vovk_Z:
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.

BradC:

--- Quote from: nctnico on September 05, 2022, 03:14:07 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.
--- End quote ---

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

Vovk_Z:
Aluminum and steel together don't corrode much.

nctnico:
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.

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