Mechanism of lightning damage on low voltage distribution equipment due to arc current

The lightning damage on low voltage power distribution systems is almost a burning of low voltage distribution equipment due to a flashover and arc dynamic or short circuit current. The lightning overvoltage causes a flashover in low voltage distribution equipment. After that, the flashover causes burning because of impressing the commercial frequency voltage. The authors conducted two kinds of experiments. The first was using low voltage distribution equipment. The second was using a real scale low voltage distribution line model. According to the first experiment, the authors suggest that the flashover current due to lightning overvoltage becomes 0 A at once when the flashover current switches to the arc dynamic current. In the second experiment, a lightning overvoltage causes burning of equipment on a low voltage power distribution system. As a result, it became possible to know the equipment burnt on a low voltage distribution system.