Alongside the construction of the Baulker Farm wind turbine foundations, electrical engineering works are also underway prior to the arrival and installation of the EWT DW54 500 kW turbine. This includes installation of the DNO switch gear and transformer for the wind turbine (see picture below). As well as the challenge presented by having to modify the turbine foundations, the Baulker Farm wind turbine site also presented a challenge with respect to the wind turbine earthing system. This is because the ground is comprised mostly of sand which has a very low conductivity. This means that under in the event of an earth fault a hot zone could be created with quite a high potential difference, which could effectively render the ground high voltage.
Unusually, this meant that the electrical substation had to be located roughly 50 meters from any metal structures, particularly the chicken sheds because they are constructed of aluminium and therefore carried a risk of electrical shock!
The main photograph (above) shows the low voltage cables running from the wind turbine foundation in the distance all the way to the substation pictured left.
The trench is filled with single core cables as this enables improved cooling. Normally this trench would be roughly 20 metres long, but due to the special earthing requirements it is much longer at Baulker Farm.
With these works now near completion, the next phase of the project will be the arrival and installation of the EWT DW54 500 kW turbine.
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