Duitse hoogspanningsmasten

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Toliman
380 kV
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Re: Duitse hoogspanningsmasten

Bericht door Toliman » 03 mar 2023 23:20

The 380 kV powerline branch to Birkenfeld north of Pforzheim, which is in March 2023 still under construction, at night. The bright "star" close to the left pinnacle of the pylon in the foreground is the planet Jupiter above which one see the brighter planet Venus.

There is one feature of these pylons, which I do not understand: why is the distance of the lowest crossbar and the middle crossbar larger than that of the middle crossbar and the topmost crossbar? The topmost crossbar will carry insulators for 380 kV as the middle crossbar. As they are all from same length, there is in principle no requirement for a larger distance between lowest and middle crossbar as between topmost crossbar and middle crossbar.
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Tom
380 kV
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Re: Duitse hoogspanningsmasten

Bericht door Tom » 04 mar 2023 19:43

Not very nice to see indeed with different distances. I guess this is because of safety requirements, to be able to work underneath top 380kV circuits when they are live.

Toliman
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Lid geworden op: 28 apr 2020 01:47

Re: Duitse hoogspanningsmasten

Bericht door Toliman » 07 mar 2023 13:15

Possible. But I believe, there will be not so often work on the 110 kV-circuits. Older towers with same conductor arrangement have crossbars in equivalent distances.

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Hans
Site Admin + actief in het mainsite team
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Lid geworden op: 03 dec 2011 20:49
Dichtstbijzijnde trafo: Veenoord 110/10 kV

Re: Duitse hoogspanningsmasten

Bericht door Hans » 09 mar 2023 12:46

Another theoretical explanation might be the clearance between 380 kV conductors and the ground. I don't have numbers which I am allowed to share without permission, but in some situations in the German grid where new expansions where 380 kV capable of 4 kA are constructed, the electromagnetic corridor at the ground is so broad that it brings spatial difficulties (existing and expected). A quick and dirty but very effective way to mitigate this is increasing the tower height to suspend the conductors higher up in the air, narrowing the corridor by means of raw vertical distance.

If for example the electromagnetic contour of the 110 kV circuits is neglegible or completely outpaced by the mighty 380 kV 4 kA above it, the operator might have chosen to increase the pylon height in order to achieve the smaller 380 kV ground profile, but without lifting the 110 kV subsequently since that would make no sense for the electromagnetic field to be observed at the ground. If the 110 kV would be raised as well, it becomes more visible, it will generate increased drag and exert more force at the tower foundation.
Halfverankering is net als Volbeat: het kan altijd

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Tom
380 kV
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Lid geworden op: 24 dec 2012 16:46
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Re: Duitse hoogspanningsmasten

Bericht door Tom » 11 mar 2023 21:30

You make me curious about the Electric field strength that is allowed. European guidelines use 5 kV/m. This is usually not too difficult to achieve with standard sized towers. Is the German requirement more strict? Or is it about magnetic fields? I thought that Germany was much less strict on that?

JarnoS
380 kV
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Re: Duitse hoogspanningsmasten

Bericht door JarnoS » 12 mar 2023 08:55

The Dutch 380kV line Zwolle- Ens between substation and tower 74 where some towers have that 110kV lower with some stick above the insulators.

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Hans
Site Admin + actief in het mainsite team
Berichten: 3835
Lid geworden op: 03 dec 2011 20:49
Dichtstbijzijnde trafo: Veenoord 110/10 kV

Re: Duitse hoogspanningsmasten

Bericht door Hans » 12 mar 2023 20:21

Tom schreef:
11 mar 2023 21:30
You make me curious about the Electric field strength that is allowed. European guidelines use 5 kV/m. This is usually not too difficult to achieve with standard sized towers. Is the German requirement more strict? Or is it about magnetic fields? I thought that Germany was much less strict on that?
Maybe I should have said just 'magnetic field', as far as I know we ususally don't have to deal with the electric component different than permittivity and permeability of conducting objects in its vicinity. The term 'EM-field' I just wrote out fully, but I meant only the magnetic component.

Germany is not yet as strict as the Netherlands for this, but it is somewhat of a concern this might change. To avoid running into problems, in advance just increasing the clearance by increasing the tower height (instead of the more complicated altering of sag/tension parameters of the conductors) is a way to prepare for a more strict future if such would arise. Note that we see this remarkable tall towers also in the new and yet incompleted line between Dörpen and Meppen, operated by TenneT GmbH. I am unfamiliar with the considerations of Amprion. Maybe this is less of a concern as well since they tend to apply also barrel towers for new lines, which are by nature blessed with a smaller corridor.

Toliman
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Lid geworden op: 28 apr 2020 01:47

Re: Duitse hoogspanningsmasten

Bericht door Toliman » 20 mar 2023 01:06

On March 19th, 2023 I photographed again the branch pylon "Anlage 4508, Mast 1224" of the powerline Hoheneck-Herbertingen east of Reutlingen. It is remarkable that all conductors on the right site of the pylon, which run to Hoheneck substation are ending blindly at the pylon. The 380 kV-circuit from Wendlingen, which also feeds Metzingen substation uses both circuits from this pylon until Herbertingen substation.

So at present the section Reutlingen-Hoheneck of the powerline Hoheneck-Herbertingen is actually unused. It is an interesting question what will happen with it in the next time. Will it be dismantled completely? Will at least the section between Reutlingen and Ehningen, where the 380 kV/220 kV-powerline Hoheneck-Herbertingen meets the 380 kV/110 kV-powerline Pulverdingen-Oberjettingen be replaced by a new line in order to realize an interconnection? Or will the old line between Hoheneck and Reutlingen just kept as unused reserve line?

As one can read on https://de.wikipedia.org/wiki/Anlage_0704 it is not impossible that a powerline in Germany can be kept as unused reserve.
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Donaumast
36 kV
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Re: Duitse hoogspanningsmasten

Bericht door Donaumast » 02 apr 2023 11:40

Toliman, you are from the Pforzheim area, right?
In the year 1920 there was the first 110 kV power line in south west Germany built between Forbach hydroelectric station and Mannheim, with a branch to Stuttgart via Pforzheim a few years later. The original power line to Mannheim was reconstructed or demolished, but the Pforzheim branch seems to exist until today.

Openstreetmap:
https://www.openstreetmap.org/#map=19/48.89200/8.59495

Do you know if this is this the power line and if it still use the original pylons?

JarnoS
380 kV
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Lid geworden op: 02 feb 2017 19:32
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Re: Duitse hoogspanningsmasten

Bericht door JarnoS » 02 apr 2023 16:15

It's a single circuit tower with a triangle shape wires.
This triangle tower or cactus tower looks like Hollandish silhouette with first two upper arms.

Geplaatste speld
https://maps.app.goo.gl/Z8M8xugNfEaAUhQ77

Driehoeksmast/Cactusmast / Single circuit tower in German: Strickleitermast

Example in German description:
https://www.flickr.com/photos/13009333@N08/19793204649/

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