Siemens Energy commissioned an eco-friendly power transmission system complementing one of China’s largest offshore eight-megawatt (MW) wind turbines. The system consists of a SF6 (sulfur hexafluoride)-free gas-insulated high-voltage switchgear (GIS) called 8VM1 Blue GIS® and a liquid-immersed distribution transformer with ester fluid. It is part of a demo project by Shanghai Electric, located at Shantou Haojiang onshore Industrial Park on the east coast of Guangdong, South China.

“The growing power demand requires a new generation of wind power plants equipped with innovative technologies. Our SF6-free switchgear and our synthetic-ester transformer are contributing to the concept of an integrated clean energy solution. This demo project demonstrates true technology leadership and we are proud to be at the forefront with our sustainable product portfolio,” says Beatrix Natter, Executive Vice President Transmission at Siemens Energy.

The wind turbine generator is the first to run on 66 kilovolt (kV) in China.  The 8VM1 Blue GIS® was specifically developed to enable higher voltage levels in wind turbines and is also the first Blue GIS® operating in China. It utilizes vacuum interrupters for switching functions and "clean air" as the insulation medium (industrially purified air) representing an environmentally friendly alternative to the potentially climate-harming insulating gas SF6. The 8VM1 Blue GIS® can be installed inside a wind tower or a transition piece thanks to its wind turbine application adopted compact and lightweight design – even with clean air insulation.

The SF6-free high-voltage gas-insulated switchgear 8VM1 with vacuum interrupting technology and clean air insulation was specifically designed for wind turbine applications.

Just like the switchgear, the transformer of type FITformer® REN was developed to operate at a grid voltage level of 66 kV for wind turbine applications. The 8.8 MVA transformer is filled with ester biodegradable insulation fluid, an environmentally friendly and operationally safe alternative to conventional mineral oil.  Its compact size and light weight allow the transformer to be installed inside the wind turbine’s nacelle.

The switchgear and transformer designs have been optimized to hold up under the hostile conditions of offshore applications and to keep the maintenance demand as low as possible.

Siemens Gas and Power GmbH & Co. KG is the global energy business of the Siemens group, which has been working with its customers on solutions for the evolving demands of industry and society for more than 150 years. With planned stock listing, Siemens’ energy business will operate independently as Siemens Energy in the future.

It will offer broad expertise across the entire energy value chain, along with a comprehensive portfolio for utilities, independent power producers, transmission system operators, the oil and gas industry, and other energy-intensive industries. With its products, solutions, systems, and services, Siemens Energy will address the extraction, processing, and transport of oil and gas as well as power and heat generation in central and distributed thermal power plants, and power transmission and technologies for the energy transformation, including storage and sector-coupling solutions. The majority stake in Siemens Gamesa Renewable Energy will round out its future-oriented portfolio. With its commitment to leading the way in decarbonization of the global energy system, Siemens Energy will be a partner of choice for companies, governments, and customers on their path to a more sustainable future. With around 90,000 employees worldwide, Siemens Energy will help shape the energy systems of today and tomorrow.

 

Source: press.siemens.com

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