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Two analytical methods for calculating eddy-current loss in a magnetic pipe of a pipe-type cable have been developed. The first is a simplified but accurate procedure which can be used as a very convenient tool in the cable design, the second is based on integral equation. In both methods, a uniform current distribution in cylindrical cable cores is assumed. The magnetization characteristic of the pipe material is assumed linear and hysteresis loss is neglected. Calculations have been made for some practical cable systems and for different configurations of the conductors in the pipe. The results are Presented in a series of graphs for various conductivities and permeabilities of the pipes. Experimental data reported by other workers are quoted to confirm the theoreticai calculations.
Date of Publication: Aug. 1985