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Siemens Energy has commissioned an eco-friendly power transmission system complementing one of China’s largest offshore 8MW 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. It utilises vacuum interrupters for switching functions and "clean air" as the insulation medium (industrially purified air) representing an environmentally friendly alternative to the insulating gas SF6. The 8.8 MVA transformer is filled with ester biodegradable insulation fluid, an environmentally friendly and operationally safe alternative to conventional mineral oil. The wind turbine generator is the first to run on 66 kilovolt in China.
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