Comparison of Voltage Rise at Transmission Tower Hit by Lightning Calculated by FDTD and Method of Moments

摘要

Voltage and current waveforms of transmission lines struck by lightning are calculated in back flashover analysis. Calculation by using equivalent circuits is the general practice, however, there are limited experimental results for reference to evaluate validity of developed equivalent circuits under various line condition. Calculation results by numerical electromagnetic analysis may be used as references if they are regarded reliable. In this paper, the voltage rise at a simple model of a transmission line hit by lightning is calculated by MoM and FDTD methods for comparison. They solve Maxwell's equations by using different algorithms, so, if the calculated results by these methods reasonably agree under various line conditions, the results of these numerical analyses may be used as references. The calculated voltage and current waveforms by the two numerical methods agree well under a variety of footing resistance of transmission towers, thus the authors conclude that the calculated results by FDTD or MoM can be employed as references to evaluate validity of circuit models for back flashover analyses.