The Sognefjord Spans are the second, third, and fourth longest spans in the world situated east of Hermansverk, Norway and are part of different powerlines. As Sognefjord Span is a deep valley the pylons of these spans are not taller than ordinary pylons. In order to avoid any too close approaches or contacts between the conductors, each is mounted on a separate pylon at the end of the span, which is built as a steel framework tower.
This span is part of the powerline between Hermansverk 61°10′49″N6°51′53″E / 61.18028°N 6.86472°E and Vikøyri 61°04′50″N6°35′13″E / 61.08056°N 6.58694°E and was built in the 1950s. It has a length of 4850 metres and was until the inauguration of Ameralik Span the longest span in the world. The span, which crosses Sognefjord in North-South direction, has 4 conductors, whereby one is for reserve. Its northern ends are at
61°10′30″N6°54′14″E / 61.17500°N 6.90389°E
61°10′29″N6°54′16″E / 61.17472°N 6.90444°E
61°10′29″N6°54′19″E / 61.17472°N 6.90528°E
61°10′27″N6°54′21″E / 61.17417°N 6.90583°E
and its southern ends are at
61°08′21″N6°51′13″E / 61.13917°N 6.85361°E
61°08′20″N6°51′17″E / 61.13889°N 6.85472°E
61°08′19″N6°51′18″E / 61.13861°N 6.85500°E
61°08′16″N6°51′18″E / 61.13778°N 6.85500°E .
Just a few hundred metres east of Span 1, the powerline from Stakaldefossen 61°26′48″N6°00′49″E / 61.44667°N 6.01361°E to Refsdal: 61°01′15″N6°34′08″E / 61.02083°N 6.56889°E crosses Sognefjord with a 4520 metres long spanin East-West direction. As Span 1 it has 4 conductors, whereby 1 is as reserve. The locations of the towers used for this span are at its western end:
61°08′08″N6°51′37″E / 61.13556°N 6.86028°E
61°08′07″N6°51′38″E / 61.13528°N 6.86056°E
61°08′05″N6°51′39″E / 61.13472°N 6.86083°E
61°08′04″N6°51′40″E / 61.13444°N 6.86111°E
and at its eastern end:
61°08′28″N6°56′39″E / 61.14111°N 6.94417°E
61°08′27″N6°56′39″E / 61.14083°N 6.94417°E
61°08′25″N6°56′36″E / 61.14028°N 6.94333°E
61°08′24″N6°56′36″E / 61.14000°N 6.94333°E .
Approximately 9 kilometres east-south east of these spans, there crosses the line from Aurland1 60°51′46″N7°18′04″E / 60.86278°N 7.30111°E to Langedøla 61°26′14″N7°14′44″E / 61.43722°N 7.24556°E Sognefjord in a span with a length of 4500 metres in North-South direction. It has no reserve conductor and consists therefore of 3 ropes. Its towers are situated at its southern end at
61°6′19″N7°03′53″E / 61.10528°N 7.06472°E
61°6′20″N7°03′55″E / 61.10556°N 7.06528°E
61°6′21″N7°03′58″E / 61.10583°N 7.06611°E
and at its north end at
61°8′45″N7°02′56″E / 61.14583°N 7.04889°E
61°8′45″N7°02′59″E / 61.14583°N 7.04972°E
61°8′46″N7°03′02″E / 61.14611°N 7.05056°E
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A transmission tower or power tower is a tall structure, usually a steel lattice tower, used to support an overhead power line.
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The Pylons of Messina are two free-standing steel towers, the Sicilian one in Torre Faro and the Calabrian one in Villa San Giovanni. They were used from 1955 to 1994 to carry a 220 kilovolt power line across the Strait of Messina, between the Scilla substation in Calabria on the Italian mainland at 38°14′42″N15°40′59″E and the Messina-Santo substation in Sicily at 38°15′57″N15°39′04″E.
The Pylons of Cádiz, also known as the Towers of Cádiz, are two 158m-tall pylons supporting a double-circuit 132 kV three-phase AC powerline over the bay of Cádiz, Spain, running from Puerto Real Substation to the substation of the former Cadiz Thermal Power Station, situated on the peninsula upon which the city of Cádiz stands.
The Ameralik Span is the longest span of an electrical overhead power line in the world. It is situated near Nuuk on Greenland and crosses Ameralik Fjord with a span width of 5,376 metres at 64°6′18″N51°14′16″W. It was built in 1993 by the Norwegian company NTE Entreprise and is part of a single-circuit 132 kV powerline running from Buksefjord hydroelectric power plant to Nuuk.
An overhead line crossing is the crossing of an obstacle—such as a traffic route, a river, a valley or a strait—by an overhead power line. The style of crossing depends on the local conditions and regulations at the time the power line is constructed. Overhead line crossings can sometimes require extensive construction and can also have operational issues. In such cases, those in charge of construction should consider whether a crossing of the obstacle would be better accomplished by an underground or submarine cable.
The Sognefjord or Sognefjorden, nicknamed the King of the Fjords, is the largest and deepest fjord in Norway. Located in Vestland county in Western Norway, it stretches 205 kilometres (127 mi) inland from the ocean to the small village of Skjolden in the municipality of Luster.
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Kootenay Lake Crossing was a powerline crossing of Kootenay Lake, British Columbia, Canada. The idea was to move electricity from the Hydro dam on the Kootenay River at Brilliant to the Cominco Sullivan Mine at Kimberley. The most direct route was across Kootenay Lake. It was with a span width of 3,248 metres (10,656 ft) the longest powerline span of North America and was fixed on two 90 metres (300 ft) tall electricity pylons. Roebling cable provided the steel support cable for the conductor. The height of conductor over Kootenay Lake was 37 metres (121 ft). There was a 100 metres (330 ft) steel support tower on the east shore, and rock anchored shorter towers high up on the west shore. Kootenay Lake Crossing was inaugurated in 1958, but was demolished in 1962 by explosives placed by the Sons of Freedom religious sect of the Doukhobors. The tower was rebuilt and the span lengthened in course. The powerline is still in operation today, but uses today on each site of the lake situated at 49°42'2"N 116°51'59"W and at 49°42'29"N 116°54'44"W.
Aust Severn Powerline Crossing is the longest powerline span in the United Kingdom with a span width of 1,618 m (5,308 ft).
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The Zhoushan Island Overhead Powerline Tie is a 220 kV three-phase AC interconnection of the power grid of Zhoushan Island with that of the Chinese mainland. It runs over several islands and consists of several long distance spans, the longest with a length of 2.7 kilometres (1.7 mi) south of Damao Island. This span uses two 370-metre-tall (1,210 ft) pylons, which are the tallest electricity pylons in the world. The north tower on Damao Island was completed in 2009, and the south tower on Liangmao Island was completed in 2010. These pylons resemble those of the Messina Strait, but are steel-tube lattice structures.
