Abstract
Lightning voltage induced by nearby strokes is one of the causes of major overvoltages which threaten insulation of power distribution lines. Surge arresters as well as an overhead ground wire are usually used for the protection of equipments and line insulation on overhead power distribution lines. The fundamental mechanism of suppressing effects of overvoltages induced by nearby strokes has been demonstrated by one of the authors independently for surge arresters and for an overhead ground wire. In this paper, the protective effect of the combination of surge arresters and overhead ground wire is analyzed. As a result, it is found that the effect of surge arresters used together with an overhead ground wire is almost the same as that of surge arresters alone.
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