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Siemens Energy has been selected by MHI Vestas Offshore Wind (MHI Vestas) to deliver 114 low-loss 66kV distribution transformers for the Seagreen Offshore Wind Farm in Scotland.
The fluid immersed distribution transformers will complement 114 MHI Vestas’ 10MW turbines that the company will deliver to the wind farm located 27 km from the Angus coastline in Scotland.
The transformer voltage class of up to 72.5 kilovolts (kV) will enable larger power capacities while keeping energy losses low. After commissioning, the distribution transformers will transform the voltage from the low voltage of produced electricity to the medium voltage level of 66kV needed to feed the offshore transmission substation before going to mainland with an even higher voltage.
The solution has been specifically designed for MHI Vestas’ needs for a lightweight and compact solution that passes through the opening in the tower base without disassembly. The transformers will be filled with safe and biodegradable ester insulation fluid. The transformers have been vibration tested to ensure they reliably cope with the highly demanding service conditions and strong vibration typical for wind power applications. In addition, a short circuit test was conducted to ensure the transformers can withstand potential short circuits. It is anticipated that the Seagreen Offshore Wind Farm will be operational by 2022/2023.
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