Abstract
In Japan, in order to improve supply reliability and power quality, distribution automation system has been widely introduced. However, automation equipment such as automation switch and its controller consists of many low-voltage devices, and therefore, vulnerability against lightning surge is a concern. From the survey results of lightning damaged automation equipment, it has shown that the main lightning damage factor is the energy of the lightning current passing through the automation equipment. In this paper, we experimentally examined lightning current distribution inside the automation equipment by direct lightning strike test using an actual-scale test distribution line. We found from experiment results that the lightning current distribution depends on the grounding system of automation equipment. To reduce the lightning current passing through the automation equipment, it is important to connect grounding conductors of the automation equipment, the surge arresters and the pole-mounted transformers at the single point.
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