Transmission line models used in travelling wave studies

In this paper, for solving the problem of simulating the travelling wave phenomena, a method used for determining the number of equivalent /spl Pi/ sections of the transmission line model in accordance with the travelling wave frequency range of interest and the model accuracy required is proposed. By analyzing the fault transients of the multiple /spl Pi/ models and comparing them with those of the distributed-parameter transmission lines, an index to evaluate the accuracy of the transmission line models is proposed. EMTP simulations show that this method is feasible and appropriate.