ABB Supply Giant Offshore Wind Plant

Press Release
Friday, June 15, 2012

ABB products help smooth power delivery from the giant Walney (UK) offshore wind plant

The Walney offshore wind plant in the East Irish Sea has a total generating capacity of 367 MW (megawatts), consisting of 102 wind turbines with a rated generating capacity of 3.6 MW each. Newly opened in February this year, the installation is part of Britain`s effort to raise total offshore generating capacity from 1.5 GW (gigawatts) now to 18 GW by 2020.

ABB supplied the Walney wind plant with four 120 MVA (megavolt ampere), 132/33 kV (kilovolts) generator step-up transformers (GSUs) for each phase of the project, two each for Walney 1 (51 turbines) and Walney 2 (51 turbines).

Other essential ABB products installed in this major project include three 145 kilovolt (kV) gas insulated switchgear (GIS) units and the main transformer surge arresters. 
GSUs are essential links that connect power stations to transmission networks. They generally operate day and night at full load, and must be built to withstand the extreme heat and accelerated aging caused by constant high electrical currents.

In addition to high electrical currents, ABB designers had also to consider magnetic fields, high-stress areas, oil flow and heat exchange in every part of the transformer windings to ensure each GSU unit delivers maximum efficiency and reliability.

Walney offshore wind farm is owned by DONG Energy, SSE (Scottish and Southern Energy) and a consortium of investment funds. 


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