Electric cable for a wind turbine and wind turbine

1. A wind turbine comprising:

a tower;

a nacelle located on a top of the tower, the nacelle including at least one opening on a top of the nacelle;

at least one electric cable disposed within the tower, the at least one electric cable comprising at least one cooling element to cool the electric cable, wherein the at least one cooling element protrudes from a surface of the electric cable; and

at least one cooling fan provided at the at least one opening on the top of the nacelle;

wherein:

the at least one cooling fan is configured to drive a circulation of air within the wind turbine to cool the at least one electric cable; or

the at least one cooling fan is configured to increase an airflow through the tower, wherein at least two openings enable air to enter and to leave an interior of the wind turbine tower, thereby cooling the at least one electric cable.

2. The wind turbine according to claim 1 , wherein the at least one cooling element is a fin.

3. The wind turbine according to claim 2 , further comprising several annular fins as cooling elements, extending, at least partially, along a circumference of the electric cable.

4. The wind turbine according to claim 3 , wherein a distance between two adjacent of the several annular fins is between 1 mm and 100 mm.

5. The wind turbine according to claim 1 , wherein the at least one cooling element is a helical, circumferential fin which extends along a periphery of the electric cable.

6. The wind turbine according to claim 1 , wherein the at least one cooling element is part of or attached to a metallic sheath of the electric cable.

7. The wind turbine according to claim 6 , wherein the metallic sheath is covered by an anti-corrosion sheath forming the surface of the electric cable.

8. The wind turbine according to claim 1 , wherein the at least one cooling element consists of metal.