In the changeover section of high speed railway, the frequent operation of surge arresters has been observed. In our previous study, it was confirmed that such frequent discharges by the changeover switchgears do not deteriorate the arresters. However, occasionally the surge arrester could develop troubles. Therefore, we developed a new surge counter to measure not only the amount of total discharge current, but also the resistive current of the leakage current in order to find out the deterioration trends of the surge arrester. In this paper, the history of our research related to the development of the new surge counter is reviewed.
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