Laplace analysis and computer simulation of transient current in power transmission lines Pt, 2-Polyphase systems with lossy earth return

In this study, an operational Laplace method is presented for analysing current propagation in 3-phase lines. Basic results obtained in Part 1(see p. 133)are systematically extended to polyphase-line investigations. Modified operational Laplace impedances are used and results can be carried out by a direct use of Laplace transforms and matrix theory. An efficient simulation method is also presented, which permits an easier computation of current surges in computers. Earth distortion and skin effects of conductors are included in the study. Analytical and simulation expressions are in terms of line and earth parameters. Therefore they make easy numerical computations of currents of different lines. Other advantages mentioned in Part 1 of the paper are also found in Part 2 of the paper, e.g. no numerical integration is needed.