Abstract
In order to clarify the response of overhead distribution lines to direct lightning hits, experimental facilities were installed at the UHV Shiobara Testing Laboratory of CRIEPI. A lightning impulse current with a crest value of 18 kA and a waveform of (2/11) mu s was generated through the impulse current generator with a high internal resistance of 400 Omega . This impulse current is not easily affected by the conditions of a distribution line side. Protective effects of surge arresters and an overhead ground wire against direct strokes to the pole of a distribution line were clarified experimentally. Experimental results showed a better protective effect than earlier calculated results. Overvoltages between a line conductor and the earth are inclined to have a short wavetail. The 50% flashover voltage of an insulator against overvoltages with a short wavetail is higher than that against overvoltages with a standard wavetail.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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