To that end, a full-scale training facility was constructed that incorporates the entire ‘T’ Pylon suite of towers.
National Grid also has responsibility to ensure that the erection, maintenance and repair of this novel design of transmission line can be carried out safely and efficiently. In addition, European-accredited test institutions were engaged in association with National Grid and the designer in compiling a robust test protocol to prove the electrical performance of the insulator array. No international standards yet exist for this arrangement and National Grid therefore engaged two domestic universities to carry out electrical performance studies. In parallel with this developmental work, the electrical performance needed to be fully understood since this was a completely new insulator arrangement that incorporates composite line insulators along with substation composite post insulators – both solid and hollow core. The diamond shaped design has to withstand high compression and torsional forces under broken wire conditions as well as extreme wind and ice. This involved producing full-scale prototypes and developing procedures to fully test mechanical performance under a number of extreme conditions.
Inmr student proof full#
In moving from concept to full design, a great deal of effort was put into the mechanical performance and manufacturing processes. As the ‘T’ Pylon moved from concept to detailed design, National Grid worked closely with the design team to develop a tower family, based on the original concept, so that it could become a viable alternative to traditional lattice designs for transmission routes of the future. The design team also engaged a number of composite insulator manufacturers to develop the insulator array.
The basic loading criteria for the design is based on an existing lattice design consisting of a double circuit 400 kV line with a maximum demand transfer of 3800 MVA on a 3-phase, triple bundled, 500 mm spaced, 700 mm 2 AAAC conductors (Araucaria) National Grid subsequently engaged this firm to take the design from concept to full engineering compliance, having established that they had the necessary experience and capability in transmission tower design. The winning design – the ‘T’ Pylon – submitted by A Danish company was the overall winner. The competition attracted 250 entries with scale models of the finalists going on public display at the Victoria and Albert Museum as part of the London Design Festival. In 2011, the Department of Energy & Climate Change as well as National Grid called on architects, designers, engineers and students to come up with innovative transmission tower designs that balance energy needs and visual impact, again carried out on a competitive basis. for the last 90 years, with the first design selected based on a design competition and evolving over time. Lattice steel structures have been deployed in the U.K. This INMR article from autumn 2015, based on a contribution by Mike Fairhurst of the National Grid, provided insight into ongoing development of unique 400 kV double circuit transmission lines across the U.K.
Inmr student proof upgrade#
The TSO, National Grid, embraced the need to harness such innovation to build new and upgrade existing transmission assets so as to operate a more flexible network, facilitating connection of customers – including an increasing proportion of lower carbon generation to meet Government environmental targets.
Upcoming changes to generation have meant substantial investment in expanding and upgrading the transmission network in the United Kingdom.
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