Abstract
A generalized multiconductor transmission line (MTL) model is developed for modeling of wide frequency transient response on busbars, cables and core-type transformer windings. Different from the traditional MTL model, the equations of the generalized MTL model are built in the cylindrical coordinate system beside rectangular coordinate system. Based on further discussion, it is found that generalized MTL model could be changed to MTL model where all lines have the same length as to the core-type transformer windings. Then, the optimized solution based on Time domain finite element method (TDFEM) is developed for the above MTL equations. It avoids numerical oscillation of the finite difference time domain (FDTD) method. The numerical results are in agreement with ones calculated by Bergeron's method and FDTD method.
Highlights
Very fast transient overvoltages (VFTOs) generated by switching operation of circuit breakers and disconnected switches could cause a voltage oscillation on the busbars, cables, and the windings inside the transformer connected
A generalized multiconductor transmission line (MTL) model is developed for modeling of wide frequency transient response on busbars, cables and core-type transformer windings
Different from the traditional MTL model, the equations of the generalized MTL model are built in the cylindrical coordinate system beside rectangular coordinate system
Summary
Very fast transient overvoltages (VFTOs) generated by switching operation of circuit breakers and disconnected switches could cause a voltage oscillation on the busbars, cables, and the windings inside the transformer connected. The transient wave process along the transmission line is calculated first, and the field is calculated [1,2,3,4,5,6]. In order to analyze the wave processes, time-domain method is always recommended. Bergeron’s method is a timedomain method, which has been widely used to calculate the wave processes in power system and has been implemented in EMTP code [7, 8]. Only the voltage and current at some specified nodes can be calculated by this method It is not effective for the calculation of the complete wave processes of voltage and current distributed along the MTLs. the problem can be solved by FDTD [9]. Because of the Gibbs effect of FDTD method, Park and Lei develop the finite-element method (FEM) and TDFEM for this problem [15, 16]
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