Lightning rod lightning protection principle and inspection requirements

In the process of lightning cloud discharge, when it starts to develop from the cloud to the earth, its direction is not affected by the ground objects, and when it is close to the ground, it develops toward the highest object on the ground.

According to the characteristics of thundercloud always discharging through high objects, a high object is specially placed on the building (or nearby) - lightning rod (belt, net), and the thundercloud developed to the protected object is guided to the lightning rod ( Belt, net), the lightning current is leaked to the earth according to a predetermined path (or the earth's opposite charge is directed to neutralize the thundercloud charge), thereby protecting the building. The lightning rod is essentially a lightning rod.

Regular inspections and tests are conducted before the annual thunderstorm day, and special tests are conducted in time. Its main content is:

1. Whether the lightning receptor is melted or broken due to lightning strikes. The arrester porcelain sleeve is free of cracks and bumps, and is subjected to preventive testing as required.

2. Whether the down-conductor line has rust, mechanical damage, breakage, etc., rust must be replaced when the cross-section is reduced by more than 30%.

3. The down conductor is damaged from 2m above the ground to 0.3m underground.

4. There is no contact failure at the connection of the disconnected card, and the soil around the grounding device is subsided.

5. Whether the protection function of the lightning protection device changes when the building, equipment and the building itself are deformed.

6. Is there any damage to the grounding device caused by earthmoving operations such as excavation and tree planting?

7. Check if the grounding resistance of all lightning protection devices meets the specified values.