System comprising a structure being prone to lightning strikes and icing, a method for operating the system and a wind turbine comprising the system

A wind turbine, comprising:

• a rotatable hub with a plurality of rotor blades, the rotatable hub connected to an electric generator;
• at least one of the rotor blades comprising:
• a shielding arrangement electrically connected to a lightning arrangement;
• an electric heating arrangement connected to a power source;
• an electrical insulation arrangement provided between the shielding arrangement and the electric heating arrangement;
• the power source housed internally within the rotor blade, the power source electrically connected to the shielding arrangement and the electric heating arrangement to apply a predetermined amount of electric test or maintenance energy between the shielding arrangement and the electric heating arrangement;
• a determination device electrically connected to the shielding arrangement and to the electric heating arrangement and configured to determine a shield-heating-voltage or a shield-heating-current present between the shielding arrangement and the electric heating arrangement, wherein the shield-heating-voltage or the shield-heating-current are caused by provision of the predetermined electric test or maintenance energy;
• a controller configured to control the power source in accordance with one or more of:
• the predetermined amount of electric test or maintenance energy is applied between the shielding arrangement and the electric heating arrangement;
• the shield-heating-voltage is applied between the shielding arrangement and the electric heating arrangement while the shield-heating-current is limited to a threshold;
• and
• a predetermined amount of the shield-heating-current is established between the shielding arrangement and the electric heating arrangement.