National Grid’s £1 billion London Power Tunnels 2 project has reached a major milestone with the arrival of a 178-tonne supergrid transformer and specialist SF6-free technology at the new 400kV Bengeworth Road substation in Lambeth. The substation, being developed in partnership with Linxon, will help reinforce the electricity network in London.
Transformer Delivery
Weighing the equivalent of 30 African elephants, the first of two transformers was delivered from the Port of Tilbury to the substation by haulage experts Allelys. The delivery, which required a specialist vehicle and police escort, traversed the streets of London (see editors’ notes for route details, images, and video).
SF6-Free Technology Marks a Green Milestone
In addition to the transformers, high voltage EconiQ™ gas-insulated switchgear (GIS) and gas-insulated lines (GIL), developed by Hitachi Energy, were also delivered. These systems, which are free of sulphur hexafluoride (SF6), represent a UK-first for a substation, as part of the move towards reducing greenhouse gas emissions in the electricity sector.
SF6 Gas and Environmental Impact
SF6 is commonly used in electrical equipment due to its chemical stability and insulating properties. However, it is one of the most potent greenhouse gases. The introduction of SF6-free technology at Bengeworth Road is a crucial step in National Grid’s plan to cut emissions of this gas by 50% by 2030.
Previous Trials and Achievements
National Grid has previously trialled SF6-free technology, such as the successful removal of SF6 from a gas-insulated busbar at its 400kV Richborough substation in Kent. Additionally, the newly energised Littlebrook substation in Kent features SF6-free equipment, helping the grid save 5.6 tonnes of SF6.
The Role of Substations in Power Distribution
Substations like Bengeworth Road play a vital role in maintaining safe and reliable electricity supplies. They change voltage levels and switch electricity flows to ensure power is transmitted efficiently across the country. The new Bengeworth Road substation is positioned strategically along the 32.5 km London Power Tunnels 2 route and will provide a 132kV connection for local operator UK Power Networks, distributing electricity to homes and businesses.
Future Deliveries
A second transformer is expected to arrive at Bengeworth Road during the first weekend of February. Two more transformers will be delivered to the New Cross substation, another key part of the London Power Tunnels 2 project, in February and throughout the spring.
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