| 摘要 |
When the lightning device is overheated because of its long-time discharge, a conductive member having a low melting point is softened and melted by the overheated tube to short-circuit an air gap between main discharge electrodes. The main discharge electrodes are thus short-circuited to protect the lightning arrester from being overheated and damaged. When discharge function is lost between the main discharge electrodes, air discharge is carried out in the air gap. Electric appliances and machine connected to the lightning arrester can be thus protected from high voltage surge.
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