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A wind turbine power production system with a closed loop hydrostatic transmission system for the transfer of mechanical energy from a wind turbine rotor to an electric generator. The hydrostatic transmission system comprises a closed loop with a pump and a motor connected by tubes or pipes. The ass

A wind turbine power production system with a closed loop hydrostatic transmission system for the transfer of mechanical energy from a wind turbine rotor to an electric generator. The hydrostatic transmission system comprises a closed loop with a pump and a motor connected by tubes or pipes. The assembly of the wind turbine rotor and the pump is arranged for rotating about a vertical axis above a swivel arranged for transferring fluid to and from the motor, fluid reservoir and other components arranged below the swivel.

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1. A wind turbine power production system with a closed loop hydrostatic transmission system for the transfer of mechanical energy from a wind turbine rotor to an electric generator, wherein said hydrostatic transmission system comprises a closed loop with a pump and a motor connected by tubes or pi

1. A wind turbine power production system with a closed loop hydrostatic transmission system for the transfer of mechanical energy from a wind turbine rotor to an electric generator, wherein said hydrostatic transmission system comprises a closed loop with a pump and a motor connected by tubes or pipes (13,14), wherein a pump shaft of said pump is directly connected to a turbine shaft of said wind turbine rotor, the assembly of said wind turbine rotor and said pump is arranged for rotating about a vertical axis, above a swivel arranged for transferring fluid in said closed loop hydrostatic transmission system to and from said motor arranged below said swivel, said power production system further comprising a fluid reservoir arranged for storing additional fluid for said hydrostatic transmission system,said swivel is further arranged for transferring leakage fluid from said pump to said fluid reservoir arranged below said swivel in a drain line. 2. The power production system according to claim 1, wherein said tubes or pipes between said pump and said swivel, and further between said swivel and said motor, are rigid tubes. 3. The power production system according to claim 1, wherein said closed loop comprises one or more valves arranged for stopping the fluid flow in the closed loop system and thereby halting said wind turbine rotor. 4. The power production system according to claim 1 wherein said motor is arranged on or near the ground. 5. The power production system according to claim 1 wherein a generator shaft of said generator is directly connected to a motor shaft of said motor. 6. The power production system according to claim 1, wherein said power production system comprises an electric swivel arranged for transferring electrical signals. 7. The power production system according to claim 1, wherein said hydraulic pump comprises said hydraulic swivel. 8. The power production system according to claim 1 further comprising a booster pump below said swivel arranged for pumping supplementary hydraulic fluid from said fluid reservoir to said hydraulic pump through a boost line, where said swivel is arranged for transferring fluid in said boost line. 9. The power production system according to claim 1 further comprising a booster pump below said swivel arranged for pumping supplementary hydraulic fluid from said fluid reservoir to said low pressure tube or pipe (14) of said hydrostatic transmission system. 10. The power production system according to claim 1 wherein a gear ratio of said hydrostatic transmission system is controlled by a control system arranged for controlling a variable displacement (d) of said hydraulic motor.