Pipe-Type Cable Losses for Balanced and Unbalanced Currents

Computations of pipe eddy current losses have been undertaken for balanced and unbalanced current using a program for transient nonlinear finite element analysis developed by one of the authors. Good agreement is obtained with experimental data from the literature. The computations indicate that the eddy current losses reach a minimum around 700 A conductor current. Experimental data are available only to about 800 A, so that this phenomenon has not been reported previously and may have an impact on rated ampacities for high pressure fluid filled (HPFF) cable. Computations for unbalanced currents indicate increased losses with increasing unbalance, as expected.