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Nissum to use Siemens switchgear

By: Matthew White 24/04/2018 Siemens

General Windfarms

Siemens supplied four panels of the 8VM1 gas-insulated SF6-free high-voltage switchgear (GIS), which has a capacity of 72.5kV, to Siemens Gamesa Renewable Energy.

The systems were deployed in the Nissum Bredning Vind wind farm in Denmark. The switchgear protects the wind turbines from overloads and short circuits.

The metal-encapsulated 8VM1 from the blue GIS portfolio was developed for use in offshore wind turbines. They work with the vacuum circuit-breaker technology and with clean air as the insulating medium instead of sulfur hexafluoride (SF6).

The wind farm operators, Nissum Bredning Vindmøllelaug and Jysk Energ, are relying on a new cable and turbine concept at a voltage of 66kV to connect the four 7MW wind turbines from Siemens to the grid.

Siemens state that in the future, 66kV could be the standard voltage for offshore turbines. A higher voltage means lower cable-laying costs and also fewer losses and that the "cable in pipe" solution also makes it possible to simplify cabling between the turbines. A slimmed-down tower concept can help save even more material.

According to Siemens, the economic prospects of the offshore wind energy technology being tested in the project are expected to demonstrate a significant positive impact on power generation costs. The Danish energy agency DEA anticipates that the components being tested in Nissum Bredning will help substantially to save on investment and operating costs.

"We're proud that our new SF6-free switchgear are being used successfully in the Nissum Bredning Vind wind farm," said Karlheinz Kronen, CEO of the High Voltage Products Business Unit in the Siemens Energy Management Division. "We've constructed the 8VM1 specifically for this type of deployment and focused on an environmentally compatible design during development. Customers will therefore benefit from the advantages of our proven vacuum switching technology with no SF6."

The Nissum Bredning wind farm features four Siemens Gamesa SWT-7.0-154 turbines which are of a slender tower concept and are designed to offer material savings. The turbines sit on specially designed gravity-jacket foundations constructed by Navantia and Windar Renovables and will be connected via 66kV array cabling.

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Nissum to use Siemens switchgear

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