PROJECT TITLE :
New Procedure for Computation of Time Delays in Propagation Function Fitting for Transient Modeling of Cables
The answer of traveling-wave equations for transient analysis of transmission lines and cables requires the identification of propagation perform and characteristic admittance. A given modal propagation function will be approximated as a rational transfer function related to an exponential time delay term. Time delays should be properly assigned prior to fitting in order to compensate excessive section lag and avoid poor fitting results. In this paper, the existing time delay calculation formula of the universal line model (ULM) is 1st demonstrated using the Bode's magnitude-phase relation and its error source is explained. The underlying assumption is that a modal propagation operate is a minimum section system once a appropriate time delay is removed. But, the numerical implementation of the procedure can generate delays that result in high fitting errors. Then, this paper contributes to a brand new methodology for estimating time delays and improving propagation perform fitting accuracy.
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