Wind Turbine Transformer Colour
It is preferable to house wind turbine transformers within the turbine towers to minimise the number of elements and visual complexity of a wind farm. However, where transformers are housed separately near the turbine bases, the colour of the housing requires careful consideration. This should be site specific, relating to the surrounding land cover, but not the wind turbines, as transformers are rarely viewed against the skyline. This reduces their visibility and ensures that they are seenas a separate element to the turbine. They are less likely to detract from the simplicity of the turbine’s form if well located and coloured. Browns, khakis and ‘earth’ colours are generally the most successful colour choices for transformers, with greens often appearing too bright.
In some locations it may be necessary to light wind turbines for reasons of civil or military aviation safety or, for offshore wind farms, marine safety. Such lighting, typically at the top of the tower of the wind turbine, may appear prominent in night views and be incongruous in predominantly un-lit rural areas. Where lighting is necessary, it should be designed to minimise landscape and visual impacts whilst satisfying health and safety or navigation requirements. This may, for example, be achieved by incorporating shields so that the lights can only be seen from above.Developers should always refer to the NATS, CAA and MoD for current requirements. Lighting is predicted to become more widespread as sites are explored within flight pathsb and as larger turbines are considered. Current experience suggests that the main landscape and visual effects are likely to include:
–lighting visible over considerable distance. The Beatrice offshore turbines, off the Caithness coast are visible in clear conditions at distances of over 20 kilometres;
–movement of turbine blades will create different effects depending on where the viewer is, in relation to the wind farm. If the turbine blades pass in front of the light, a flashing effect as they cut across the light is created. If the blades pass behind the light, the are is a striped effect as the light runs up the passing blades. In both cases the seeffects draw the eye to the turbines;
–there may be situations where constantly flashing lights are required, especially offshore;
–in certain light conditions, lighting may appear to float above the ground even where the turbines themselves are not visible.
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