Keeping Wind Farm Systems Cool

The power generated by the wind turbine is in AC mode and to prevent energy loss in the transfer of power the current is converted to DC through the transformer. During the AC to DC current conversion there is heat generated and cooling is required to minimise the energy lose and prevent the turbines from catching fire. Typically during this current transfer about 1% energy loss occurs. Material Requirements on the distribution system for wind turbines Dielectric strength  Combination of ac and dc voltage stress put high requirements on purity and insulation properties of the material Mechanical strength High and stable mechanical strength is required to give freedom in choice of geometries and shapes for details of the piping system. Machinability Good machinability allows for complex geometries and narrow tolerances to ensure long term tightness of the system Weld ability Good and stable welding properties with material strength comparable to the base material gives high freedom in design of the system  Material stability With a required design life time of plus 30 years, in an environment with high temperature and high mechanical and electrical stress, the material must show a high degree of stability in order to ensure long life. Fire retardancy The handling of large amounts of power gives risk for excess heat and requires a fire retardant material to limit the consequences of a system malfunction. The cooling manifold is typically supplied in stainless steel.  Given the corrosion for stainless steel near the sea it can be replaced by a PVDF assembly. Some of the advantages of PVDF include excellent mechanical /electrical properties, effective shaping and welding...