Systems and methods for cooling power transmission systems

A method for cooling a power transmission system that comprises a cable configured to carry a current corresponding to a transported electric power, the method comprising:

• extracting a power fraction from the cable;
• and
• supplying a cooling device, which is configured to remove heat from the power transmission system, with the extracted power fraction,
• wherein the power fraction is extracted so that:
• when a parameter of the electric power transported in the cable is higher than a threshold, the extracted power fraction is equal to a first value that depends on the electric power carried in the cable through a first function;
• and
• when the parameter is lower than the threshold, the extracted power fraction is equal to a second value that depends on the electric power carried in the cable through a second function, the second function corresponding to the first function multiplied by a unitless factor k, where the unitless factor k is greater than 0, and where the unitless factor k is less than 1.

A cooling system for cooling a power transmission system that comprises a cable configured to carry a current corresponding to a transported electric power, the cooling system comprising:

• a cooling device configured to remove heat from the power transmission system;
• a power supply system configured to extract a power fraction from the cable and configured to supply the cooling device with the power fraction;
• and
• a control unit configured to control an amount of the extracted power fraction in response to a parameter of the electric power transported in the cable, so that:
• when the parameter is higher than a threshold, the extracted power fraction is equal to a first value that depends on the electric power carried in the cable through a first function of the current carried by the cable;
• and
• when the parameter is lower than the threshold, the extracted power fraction is equal to a second value that depends on the electric power carried in the cable through a second function of the current carried by the cable, the second function corresponding to the first function multiplied by a factor k, where the factor k is greater than 0, and where the factor k is less than 1.