A development of a generalized frequency-domain transient program-FTP

The frequency-domain transient program (FTP) is based on a frequency-time transform method using nodal analysis, admittance parameters, and modal theories. Discontinuous and nonlinear elements are solved as initial condition problems using a piecewise linear approximation. The FTP is used to solve for the transient and steady states of a network composed of an arbitrary interconnection of basic circuit elements. The FTP is structured to be compatible with the Electromagnetic Transients Program (EMTP), so that the same input data and output formats can be used. The present version of the FTP can deal with a network with over a hundred nodes and branches. Comparisons of calculated results obtained with the FTP with results of field tests and calculations by the EMTP confirm the high accuracy and satisfactory efficiency of the FTP. The FTP offers the most accurate or theoretically exact solutions of transients on distributed-parameter lines