Abstract
In Japan, the total number of the faults on a 6.6 kV power distribution line has decreased due to installation of ZnO (zinc oxide) surge arresters at the interval of less than 200 m. However, the proportion of faults caused by lightning still keeps a high value, 10–15%. The damage of arresters occurs frequently at the coast of the Sea of Japan where thunderstorms in winter are notable. It is shown that the surge arresters are damaged when the absorption energy exceeds the rated value. One of the characteristics of winter lightning is high energy resulting in the arrester damage. In this paper, the authors consider damages of surge arrester on a distribution line connected to the wind turbine through the EMTP (Electro-Magnetic Transient Program). The authors show the probability of surge arrester damage by the lightning flash to the turbine and discuss the lightning protection design against surge arrester damage.
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