Ocean current power is focused on one of big marine renewable energy resources. To take advantage of the current, two floating type marine current turbines i.e. the contra-rotating system and the twin-turbine system are proposed. It is important to investigate about the mooring system combined with the power cable to establish floating type marine current turbines in deepwater. In this concept, a power cable is connected to the floating turbine along with a mooring line. This paper presents bending radius of a power cable and analysis of a mooring line equipped with a power cable. In the experiment, hydrodynamic forces on the mooring line are measured in the circular tank with two polyvinyl chloride pipes modeling a power cable and a mooring line for variation of current velocity and distance between two pipes. The lumped-mass method taking in experimental date into account is used for simulation of tension variation of a mooring line and a power cable. Results show that if the interval of adjacent two pinned connections is kept at a certain value, the required minimum bending radius is satisfied. It is also found that influence of power cable on the mooring line is small.
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