A contactless power station (CLPS) with cone-type coils is proposed for use in the sea. The cone-type coils are used in order to keep the efficiency high by means of dislocation. It was confirmed that the power transmission characteristics in the sea agreed well with those in the air. The mutual inductance and self-inductance were calculated by using Neumann’s formula, which involves by the diameters of the coils, the number of turns and the coil gap. It was confirmed that the calculated values agreed well with the experimental values. The relation between the coupling factor and the ratio of the coil diameter and the coil gap was discovered, and the coil was designed for the optimum load.
