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River Medway Cable Tunnels
The River Medway Cable Tunnels are a pair of tunnels carrying high-voltage electricity transmission lines beneath the lower River Medway between the Isle of Grain and Chetney Marshes, Kent. Specification Each tunnel carries a 400 kV electricity circuit on the transmission line between the National Grid substations at Grain and Kemsley (Line Reference: 4TL). The oil-filled cables are designed to carry 3780 Amps in Winter and 3060 A in Summer. The tunnels are 1,700 metres long, 2.54 m in diameter and between 34 m and 47 m below ordnance datum. The tunnels are connected to a common 6.1 m diameter vertical access shaft at each end. Grain sealing end compound location: 51°26'09.4"N 0°42'18.9"E Chetney Marsh sealing end compound location: 51°25'14.6"N 0°41'59.6"E Design and construction The tunnels were built in anticipation of the commissioning of Grain power station (with a planned capacity of 3,300 MW). The crossing would allow the transmission of power to the 400 kV t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Central Electricity Generating Board
The Central Electricity Generating Board (CEGB) was responsible for electricity generation, transmission and bulk sales in England and Wales from 1958 until privatisation of the electricity industry in the 1990s. It was established on 1 January 1958 to assume the functions of the Central Electricity Authority (1955–7), which had in turn replaced the British Electricity Authority (1948–55). The Electricity Council was also established in January 1958, as the coordinating and policy-making body for the British electricity supply industry. Responsibilities The CEGB was responsible for electricity generation, transmission and bulk sales in England and Wales, whilst in Scotland electricity generation was carried out by the South of Scotland Electricity Board and the North of Scotland Hydro-Electric Board. The CEGB's duty was to develop and maintain an efficient, coordinated and economical system of supply of electricity in bulk for England and Wales, and for that purpose t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
400 KV Thames Crossing
The 400 kV Thames Crossing is an overhead power line crossing of the River Thames, between Botany Marshes in Swanscombe, Kent, and West Thurrock, Essex, England. Its towers are the tallest electricity pylons in the UK. The present crossing was built in 1965, and comprises two 190-metre (623 feet) tall lattice towers each side of the Thames. Some suggest that the choice of this height was deliberate, being just taller than the BT Tower in London. The span is , the minimum height of the conductors over the river is 76 metres (249 feet). Each tower has three crossarms and carries two circuits of 400 kV three-phase AC. 400 kV power lines also cross the Thames at the Thames Cable Tunnel, the Dartford Cable Tunnel, and the London Power Tunnels. 132 kV Thames Crossing There was at one time an earlier 132 kV crossing nearby, with towers 148.4 metres tall. Linking Dagenham and Crossness, it was built between 1927 and 1932 and was part of the Belvedere-Crowlands 132/33/25 kV doubl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Powerline River Crossings , South African soccer club
{{Disambiguation ...
Powerline may refer to: Technology * Overhead power line, used for electric power transmission * Power-line communication, a computer networking technology * Powerline, a status line plugin for vim and other application; see Private Use Areas Music and media * ''Powerline'' (magazine), an American music magazine and website * Power Line, a political blog * "Power Lines", a 2016 single by TIGRESS * "Power Lines", a 2012 song by Reks from '' Straight, No Chaser'' * Powerline, a fictional singer in the ''A Goofy Movie'' musical Sport *Powerlines F.C. Powerlines F.C. is a South African soccer club. Founded in 1959 as Velocitas F.C., they competed in the National Football League The National Football League (NFL) is a professional American football league that consists of 32 teams, d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dartford Cable Tunnel
The Dartford Cable Tunnel is a 2.4 km utility tunnel beneath the Thames, upstream of the Dartford Crossing. With a diameter of ~, it carries a 400 kV National Grid electrical transmission cable. It is accessible by foot as a crossing of the Thames, but by authorised personnel only. It was built in 2003–04 at a cost of £11 million (equivalent to £ million in ). See also * 400 kV Thames Crossing * Thames Cable Tunnel * * |
Thames Cable Tunnel
The Thames Cable Tunnel, also known as the Tilbury – Gravesend Cable Tunnel, is a tunnel carrying high-voltage electrical transmission lines beneath the lower River Thames between Tilbury and Gravesend. It remains the furthest tunnel downstream on the Thames. Completed in 1970 at a cost of around £3 million (equivalent to £ million in ) by the Central Electricity Generating Board, the tunnel carries 400 kV transmission cables between substations at Tilbury and Kingsnorth as part of the National Grid. The tunnel is approximately deep, and was one of the first tunnels in the UK to be lined with pre-cast concrete segments rather than cast iron. A tunnel was chosen due to the high costs of building an overhead transmission line at this point in the river. See also * 400 kV Thames Crossing * Dartford Cable Tunnel The Dartford Cable Tunnel is a 2.4 km utility tunnel beneath the Thames, upstream of the Dartford Crossing. With a diameter of ~, it carries a 400 kV ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Medway Cable Tunnel South Pylon - Geograph
Medway is a unitary authority district and conurbation in Kent, South East England. It had a population of 278,016 in 2019. The unitary authority was formed in 1998 when Rochester-upon-Medway amalgamated with the Borough of Gillingham to form Medway Towns. It is now a unitary authority area run by Medway Council, independent of Kent County Council but still part of the ceremonial county of Kent. Medway is one of the boroughs included in the Thames Gateway development scheme. It is also the home of Universities at Medway, a tri-partite collaboration of the University of Greenwich, the University of Kent and Canterbury Christ Church University on a single campus in Chatham, together with the University for the Creative Arts, which has a campus in Rochester. Geography Because of its strategic location by the major crossing of the River Medway, it has made a wide and significant contribution to Kent, and to England, dating back thousands of years, as evident in the sitin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
London Clay
The London Clay Formation is a marine geological formation of Ypresian (early Eocene Epoch, c. 56–49 million years ago) age which crops out in the southeast of England. The London Clay is well known for its fossil content. The fossils from the lower Eocene rocks indicate a moderately warm climate, the tropical or subtropical flora. Though sea levels changed during the deposition of the clay, the habitat was generally a lush forest – perhaps like in Indonesia or East Africa today – bordering a warm, shallow ocean. The London Clay is a stiff bluish clay which becomes brown when weathered and oxidized. Nodular lumps of pyrite are frequently found in the clay layers. Pyrite was produced by microbial activity ( sulfate reducing bacteria) during clay sedimentation. Once clay is exposed to atmospheric oxygen, framboidal pyrite with a great specific surface is rapidly oxidized. Pyrite oxidation produces insoluble brown iron oxyhydroxide (FeOOH) and sulfuric acid leading to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mowlem
Mowlem was one of the largest construction and civil engineering companies in the United Kingdom. Carillion bought the firm in 2006. History The firm was founded by John Mowlem in 1822, and was continued as a partnership by successive generations of the Mowlem and Burt families, including George Burt, and Sir John Mowlem Burt. The company was awarded a Royal Warrant in 1902 and went public on the London Stock Exchange in 1924.''Mowlem 1822–1972'' – Mowlem Public Relations brochure, 1972, p.3 During the Second World War the company was one of the contractors engaged in building the Mulberry harbour units.Hartcup, p. 94 A long-standing national contractor, Mowlem developed a network of regional contracting businesses including Rattee and Kett of Cambridge (bought in 1926); E. Thomas of the west country (bought in 1965) and the formation of a northern region based in Leeds in 1970. The network was further augmented by the acquisition of Ernest Ireland of Bath (bought in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Grain Power Station
Grain Power Station is a CCGT power station and former oil-fired power station in Kent, England, with operational capacity of owned by Uniper (formerly E.ON UK). Oil-fired power station Grain was built on a site for the nationalised Central Electricity Generating Board. The architects were Farmer & Dark with Donald Rudd and Partners. It was built by several contractors including John Laing Construction (Civils), the Cleveland Bridge Company (steel frame and cladding), N. G. Bailey (electrical), Babcock & Wilcox (boilers) and GEC Turbine Generators Ltd (steam turbines). The site was selected in 1971 and construction had begun by 1975. The station became operational in 1979. The principal buildings were the main boiler house - turbine house block, an attached central control wing, a detached range of offices, the chimney and a gas turbine power station. The buildings are steel framed and reinforced concrete construction. The main boiler house – turbine house block was ne ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
National Grid Plc
National Grid plc is a British multinational electricity and gas utility company headquartered in London, England. Its principal activities are in the United Kingdom, where it owns and operates electricity and natural gas transmission networks, and in the Northeastern United States, where as well as operating transmission networks, the company produces and supplies electricity and gas, providing both to customers in New York and Massachusetts. National Grid plc is one of the largest investor-owned utility companies in the world; it has a primary listing on the London Stock Exchange where it is a constituent of the FTSE 100 Index, and a secondary listing in the form of its American depositary receipts on the New York Stock Exchange. History Background (CEGB before 1990) Before 1990, both the generation and transmission activities in England and Wales were under the responsibility of the Central Electricity Generating Board (CEGB). The present electricity market in the Un ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ordnance Datum
In the British Isles, an ordnance datum or OD is a vertical datum used by an ordnance survey as the basis for deriving altitudes on maps. A spot height may be expressed as AOD for "above ordnance datum". Usually mean sea level (MSL) is used for the datum. In particular: * In Great Britain, OD for the Ordnance Survey is ODN (Ordnance Datum Newlyn), defined as the MSL as recorded by the tidal gauge at Newlyn in Cornwall between 1915 and 1921. **Prior to 1921, OD was defined as MSL as recorded in the Victoria Dock, Liverpool, during a short period in 1844 (ODL). * In Northern Ireland, OD for the Ordnance Survey of Northern Ireland is Belfast Ordnance Datum, the MSL at Clarendon Dock, Belfast, between 1951 and 1956. * In the Republic of Ireland, OD for the Ordnance Survey of Ireland is Malin Ordnance Datum: the MSL at Portmoor Pier, Malin Head, County Donegal, between 1960 and 1969. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ampere
The ampere (, ; symbol: A), often Clipping (morphology), shortened to amp,SI supports only the use of symbols and deprecates the use of abbreviations for units. is the unit of electric current in the International System of Units (SI). One ampere is equal to electrons worth of charge moving past a point in a second. It is named after France, French mathematician and physicist André-Marie Ampère (1775–1836), considered the father of electromagnetism along with Denmark, Danish physicist Hans Christian Ørsted. As of the 2019 redefinition of the SI base units, the ampere is defined by fixing the elementary charge to be exactly C (coulomb), which means an ampere is an electrical current equivalent to elementary charges moving every seconds or elementary charges moving in a second. Prior to the redefinition the ampere was defined as the current that would need to be passed through 2 parallel wires 1 metre apart to produce a magnetic force of Newton (unit), newtons per me ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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