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The construction of the UHV designed transmission lines had been finished in 1999, and UHV designed transmission lines have been in operation at 500kV. On UHV designed transmission lines, the transmission towers are high, and a distance between the phase conductor and the ground wire is long. From these viewpoints, it is important to evaluate the characteristics of direct lightning strokes to the phase conductors. However, the characteristics of direct lightning strokes have hardly been known yet. So, we have been observing direct lightning strokes to study their characteristics. This paper presents results of the observation and analysis of direct lightning strokes to the phase conductors on UHV designed transmission lines in three years from 1998 until 2000. We report mainly about the peak current, the front duration and the tail duration of the current waveform, which are most fundamental parameters as the characteristics of the direct lightning strokes. In this paper, at first an example of the observation and the analytic process which EMTP was used for is shown, next, the statistics distributions of the direct lightning strokes parameters are reported. This paper will be useful for the rationalization in insulation design of the electric power equipment.

Characteristics of Direct Lightning Strokes to Phase Conductors on UHV Designed Transmission Lines