The primary aim of surge arresters in power distribution lines is to protect lines and equipment from the voltage induced by nearby lightning strokes. For the further improvement of the power system, protection of distribution lines against direct lightning strokes needs to be investigated. One of the effective measures against direct lightning strokes is to increase the number of arresters. However, if the surge current is too large, some surge arresters absorb a large amount of energy in excess of their capability and may be broken, leading to a line fault. To evaluate the protective effect of the surge arresters against direct lightning strokes to overhead ground wire, the authors measured the voltage across arresters and the energy absorbed by surge arresters using a full scale model line and a 12MV inpulse generator. The results were compared with simulation results by EMTP. There have been no previous studies making a comparison of this kind.
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