A simplified model of corona discharge for finitedifference time-domain (FDTD) computations has been applied to analyzing lightning surges propagating along overhead wires with corona discharge. The FDTD computations simulate the experiments of Inoue and Wagner et al.. In Inoue's experiment, a 12.65-mm radius, 1.4-km-long overhead wire was employed, and in Wagner et al.'s experiment, a 21-or 25-mm radius, 2.2-km-long overhead horizontal wire was employed. The critical electric field on the surface of the 12.65-mm-radius wire for corona initiation is set to E 0 = 1.4, 2.4, or 2.9 MV/m, and those for 21-and 25-mmradius wires are set to E 0 = 2.2 and 2.1 MV/m, respectively. The critical background electric field for streamer propagation is set to E cp = 0.5 MV/m for positive voltage application and E cn = 1.5 MV/m for negative voltage application. The FDTD-computed waveforms (including wavefront distortion and attenuation at later times) of surge voltages at three different distances from the energized end of the wire agree reasonably well with the corresponding measured waveforms. Also, the FDTD-computed waveforms of surge voltages induced on a nearby parallel bundled conductor agree fairly well with the corresponding measured waveforms.
In this paper, a simplified model of corona discharge for the finite-difference time-domain (FDTD) computations has been applied to analyzing a lightning surge propagating along a 12.65-mm-radius and 1.4-km long overhead horizontal wire, which simulates the experiment of Inoue (1983). The critical electric field on the surface of the 12.65-mm-radius wire for corona initiation is set to E 0 =1.4, 2.4 or 2.9 MV/m. The critical background electric field for streamer propagation is set to E cp =0.5 MV/m for positive voltage applications, and E cn =1.5 MV/m for negative voltage applications. The FDTD-computed waveforms of surge voltage at different distances from the energized end of the wire agree reasonably well with the corresponding measured waveforms.
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