Siemens supply EA1

SiemensSiemens will supply 102 SF6-free, gas-insulated 8VM1 high-voltage switchgear (GIS) to Siemens Gamesa by the middle of next year. The switchgear aims to protect each wind turbine individually against overloads and short-circuits and make it possible to supply electricity reliably and without interruption.

Developed for wind farms, the 8VM1 from the blue GIS portfolio operates with vacuum circuit-breaker technology and with clean air instead of sulfur hexafluoride (SF6) as the insulating medium.

The switchgear are destined for the
East Anglia ONE offshore wind farm, which will supply up to 600,000 British homes with electricity starting in 2020.

Siemens Gamesa is building the wind farm for ScottishPower Renewables in approximately 300km2 of space, and is using a new connection and wind farm grid concept with a voltage of 66kV.

Compared to the usual 33kV connection, it increases the transmission capacity of each cable and reduces transmission losses. For this purpose, Siemens Gamesa has adapted the substation transformers and converters to the wind turbines. Siemens will ship all 102 switchpanels by mid-2019.

The 8VM1 blue GIS is a development of the switchgear technology that operates with SF6 as the insulating, switching, and extinguishing gas.

"We are very pleased to see the market quickly accepting the clean air technology and, combined with the 66 kV voltage level, it will offer our customers real savings potential,"
says Karlheiz Kronen, CEO of the High Voltage Products Business Unit within the Siemens Energy Management Division.

"Customers can benefit from both economic feasibility and an excellent degree of environmental compatibility. We worked together with the customer at a very early stage in the project and found the optimum solution for installing the switchgear in the base of the turbine."
He concluded.

At present, the £2.5bn
East Anglia ONE will consist of 102 Siemens Gamesa 7MW wind turbines, giving an overall generating capacity of up to 714MW, which is enough green energy to supply over half a million homes.

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