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Long span between power poles
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DavidAlfa:

--- Quote from: Gyro on September 25, 2023, 08:52:25 am ---I wonder what other long span conductors are made of, it seems unlikely that they would be of the same detail and composition.

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AFAIK nowadays it's a steel cable core surrounded with strands of aluminium, called ACSR (Aluminum Conductor Steel Reinforced).
Gyro:

--- Quote from: soldar on September 25, 2023, 10:30:21 am ---
--- Quote from: IanB on September 24, 2023, 10:10:27 pm ---  Unfortunately, I think it is not there anymore at that location.
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I would think there's a good chance it was destroyed by that specialized German demolition team, the Luftwaffe.

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I'm not so sure about that. Hitting the fairly widely strung conductors and narrow steel lattice pylons would have been no easy task, short of a direct collision. The pylons were also designed to withstand breakage of 3 of the 6 conductors. Much larger targets were missed. I wonder what sort of conductors are used on the new crossing. Probably something much more boring like Steel / Aluminium as DavidAlfa says.


EDIT: Checking the web, there is some general information. The new (Thurrock Swanscombe) crossing was errected, predictably, to increase operating voltage to 400kV, up from 132kV on the Dagenham one, in 1965. The new pylons are 190m (623ft) high, with a span of 1372m (4501ft). Minimum headroom dropped by 1ft to 249ft. The Dagenham crossing was only dismantled in 1987 (they missed!)...  https://en.wikipedia.org/wiki/400_kV_Thames_Crossing

There's also a list of spans link on the page... https://en.wikipedia.org/wiki/List_of_spans
tom66:

--- Quote from: The Electrician on September 16, 2023, 02:14:06 pm ---I wonder what the longest power line span in the world is?
Here's a candidate: https://www.tacomadailyindex.com/blog/tacoma-power-celebrates-tacoma-narrows-crossing-completion/993822/

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There's some very impressive power poles that bridge the Bosporus in Istanbul (I was there recently):

https://www.google.com/maps/@41.0804261,29.052722,3a,61.3y,190.55h,94.25t/data=!3m6!1e1!3m4!1sNXJvucTIyyApaO7BfLwGPg!2e0!7i16384!8i8192?entry=ttu

Although it looks like it is only about 1km apart, it must be quite a challenge with the strong winds here and keeping it away from the tallest ships (60m above the waterline from a quick Google as plenty of cruise behemoths pass through this area).  I wonder how much it sags under high temperatures when all the air conditioning is running.

Also there's these, which I accidentally saw on a trip to Spain, I think about 2km apart:
https://en.wikipedia.org/wiki/Pylons_of_C%C3%A1diz
soldar:

--- Quote from: tom66 on September 25, 2023, 06:51:20 pm ---Also there's these, which I accidentally saw on a trip to Spain, I think about 2km apart:
https://en.wikipedia.org/wiki/Pylons_of_C%C3%A1diz
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Interesting. I had never known of this. 1660 m, just over one mile. I find it amazing that in the decades following WWII the entire western world did so much building of infrastructures and now it is like we cannot even maintain it.
.RC.:

--- Quote from: soldar on September 26, 2023, 09:10:08 am --- I find it amazing that in the decades following WWII the entire western world did so much building of infrastructures and now it is like we cannot even maintain it.

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I am in the same boat.  I look at what was built just in my part of the world in the post WW2 time period and then in the past twenty years the crumbling infrastructure it not replaced as it is "unaffordable" despite being built when the country/state/county/shire was far less wealthy.

My theory is these days in first world countries, there are fewer people doing the real work of engineering, and actual construction and more and more people with clip boards going around saying I do not know what you are doing, but my book says you are doing it wrong.  In general people who goal it is to make things more expensive via regulation.
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