engineering

Powerline river crossings in the United Kingdom

Powerline river crossings in the United Kingdom is a engineering topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Powerline river crossings in the United Kingdom rather than just read about it. In short: In the United Kingdom, powerlines cross rivers and estuaries either in the form of overhead lines or with cables carried in tunnels. Overhead power lines are supported on towers (called pylons in the UK) which are usually significantly taller than overland pylons and are more widely spaced to cross the river in a single span.

Key takeaways

Powerline river crossings in the United Kingdom belongs to engineering; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Powerline river crossings in the United Kingdom to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Powerline river crossings in the United Kingdom from memory before moving on to harder problems.

Reference excerpt

In the United Kingdom, powerlines cross rivers and estuaries either in the form of overhead lines or with cables carried in tunnels. Overhead power lines are supported on towers (called pylons in the UK) which are usually significantly taller than overland pylons and are more widely spaced to cross the river in a single span. Tall pylons ensure that the electricity cables which they support provide an adequate safety clearance for river traffic.

Overhead crossings The tallest and longest overhead power line river crossings in the United Kingdom are:

The tallest electricity pylons in the UK are those of the 400 kV Thames Crossing, at West Thurrock, which are 190 m (630 ft) high. These were constructed by BICC in 1965. The cables stretch 1300 m (4,500 ft) across the River Thames and have a minimum clearance of 76 m (250 ft). There are two 400 kV circuits that connect Littlebrook substation on the south bank to West Thurrock substation on the north side.

The longest powerline river crossing in the UK is the Aust Severn Powerline Crossing over the River Severn at Aust, stretching 1700 m (5,310 ft) between towers 148 m (488 ft) high. The line was commissioned in 1959 and comprises two 275 kV electricity circuits forming part of the line between Iron Acton and Whitson substations. This pylon crossing is paralleled by the Severn-Wye Cable Tunnel beneath it, at almost the same location.

List of overhead powerlines This is an incomplete list of overhead powerline river crossings in the UK.

Cable tunnel river crossings In addition to overhead powerline river crossings, there are also underground powerline river crossings.

River Thames Tunnels under the River Thames, from east to west are:

Thames Cable Tunnel, between Tilbury and Gravesend, commissioned in 1970, comprising two 400 kV circuits between Tilbury and Kingsnorth substations Dartford Cable Tunnel, between Littlebrook substation and West Thurrock substation, constructed 2003–04, comprising two 400 kV circuits Barking Cable Tunnel, between Barking and Thamesmead, comprising four 33 kV circuits Millennium Dome electricity cable tunnel, between West Ham substation and the Millennium Dome, comprising 11 kV circuits Deptford River Tunnel, between Deptford and Millwall Isle of Dogs, comprising 30 11 kV circuit New Cross to Finsbury Market Cable Tunnel, between Bermondsey and Wapping, built between 2009 and 2017, comprises three 132 kV circuits Bankside river Tunnel, between Bankside and Blackfriars, connects Bankside substation and City Road substation, comprises 132 kV and 33 kV circuits Bankside – Charing Cross, crosses beneath Hungerford Bridge, comprises two 20 kV circuits Wimbledon – Pimlico Cable Tunnel, crosses the Thames between Nine Elms and Pimlico, comprises a 132 kV circuit Battersea Power Station Tunnels London Power Tunnels Kensal Green to Wimbledon, crosses the Thames between Wandsworth and Hurlingham, constructed between 2011 and 2016, comprises a single 400 kV circuit.

Cable tunnels under other rivers Other underground tunnel cable crossings are:

River Medway Cable Tunnels under the lower River Medway between Grain and Chetney Marshes, Kent, built between 1973–76, comprises two 400 kV circuits Fawley Tunnel under Southampton Water between Fawley and Chilling, built between 1962 and 1965, comprises two 400 kV circuits Severn-Wye Cable Tunnel under the River Severn and Wye between Aust and Newhouse, two 400 kV circuits. This runs parallel to the Severn overhead pylon crossing (see above), and was commissioned in 1972.

Incidents The 430-ft high 275kV Tyne Crossing collapsed on 16 February 1962, on the same day there was the British highest wind speed of 177mph on Lowther Hill in south-west Scotland. The pylon at Jarrow crashed at 4 a.m., and the pylon at East Howdon crashed at 5.20 a.m. The Jarrow pylon crashed onto oil pipes of the neighbouring Shell oil terminal. The North Eastern Electricity Board had planned a transmission line from Blyth to Teesside in 1958; Jarrow Borough Council wanted the cables to go underground. It was part of the 50-mile Blyth to Lackenby 275kV line. The transmission line was built around December 1961. The crossing was rebuilt from 4 November 1962.

References

"Notes and news". Greater London Industrial Archaeology Society. February 2003.

Worked examples

Example 1 — a first encounter with Powerline river crossings in the United Kingdom

Start with the simplest possible case. Write down what Powerline river crossings in the United Kingdom claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In engineering, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Powerline river crossings in the United Kingdom before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Powerline river crossings in the United Kingdom ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Powerline river crossings in the United Kingdom

In research: Powerline river crossings in the United Kingdom appears in engineering research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Powerline river crossings in the United Kingdom in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Powerline river crossings in the United Kingdom is common in secondary-school and first-year university syllabi. It links to neighbouring topics Buildings and structures in the United Kingdom, Electric power infrastructure in the United Kingdom, Electric power transmission in the United Kingdom, so understanding it makes those chapters shorter.
In everyday life: Look for Powerline river crossings in the United Kingdom outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Powerline river crossings in the United Kingdom in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Powerline river crossings in the United Kingdom means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Powerline river crossings in the United Kingdom out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Powerline river crossings in the United Kingdom in simple terms?

Why does Powerline river crossings in the United Kingdom matter?

Because it connects several engineering ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Powerline river crossings in the United Kingdom?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Powerline river crossings in the United Kingdom.