The Condition of Surge Protective Elements Installed in the Indoor Equipment due to Lightning Surges
Takahiro Otsuka, Koji Maezaki · IEEJ Transactions on Power and Energy · 2001
Due to the rapid increase of miniaturized and networked indoor equipment (electric appliances) in highly information-oriented society, the number of lightning damage has been increasing. Since the indoor equipment has AC power line and communication line, the potential difference by lightning surge occurs between grounds, and the equipment connected between grounds becomes the passage route. As a result, when the equipment becomes passage route of the lightning surges, it causes the flashover and it become the damage. Above mentioned relation is also similar on the equipment with the grounding conductor. In order to investigate the lightning damage of indoor equipment, authors prepared the model house and then surge protective elements installed in the indoor equipment was arranged. Using this experiment circuit, the relationship between operating condition and grounding resistance value for lightning surge from the power side was investigated experimentally. In addition, the application of low voltage arrester to AC power service entrance was examined experimentally for the purpose of the protection of indoor equipment against the lightning.