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Classification of building lightning protection

April 07,2023

The first type of lightning protection building refers to a building that manufactures, uses, or stores a large amount of hazardous substances such as explosives, gunpowder, initiating explosive materials, and initiating explosive devices. When encountering electric sparks, it can cause explosion, resulting in huge damage or personal injury.

The second type of lightning protection building refers to buildings that are of great significance to national politics or national economy, as well as buildings that manufacture, use, and store explosive hazardous substances, but are not prone to explosion due to electric sparks or cause significant damage and personal injury.

The third type of lightning protection building refers to buildings that require lightning protection, except for the first and second types of lightning protection buildings.

Direct lightning protection:

Measures should be taken to prevent direct lightning strikes in areas susceptible to lightning strikes such as Class I lightning protection buildings, Class II lightning protection buildings, and Class III lightning protection buildings, as well as facilities or materials that have suffered serious consequences from lightning strikes, high-voltage overhead power lines, power plants, and substations. Installation of lightning rod, lightning wire, lightning network and lightning strip is the main measure for direct lightning protection. The lightning rod is divided into independent lightning rod and attached lightning rod. Independent lightning rod shall not be set in places where people often pass. The protection range of lightning rod is calculated by rolling ball method.


Secondary discharge protection:

In order to prevent secondary discharge, whether in the air or underground, it is necessary to ensure sufficient safety distance between the lightning arrester, down lead, grounding device, and adjacent conductors. In any case, the minimum distance for preventing secondary discharge in the first type of lightning protection building shall not be less than 3m, and the minimum distance for preventing secondary discharge in the second type of lightning protection building shall not be less than 2m. When the spacing requirement cannot be met, it should be bridged.

Induction lightning protection:

Buildings with explosion and fire hazards and important power facilities should consider induction lightning protection. In order to prevent the danger of electrostatic induction thunder, the uncharged metal equipment and metal structures in the building shall be connected as a whole and grounded. To prevent the danger of electromagnetic induced lightning, parallel pipelines and pipelines less than 100mm apart should be bridged with metal wires.

Lightning shock wave protection:

Lightning shock wave protection should be considered for power transformation and distribution equipment and buildings that may have lightning shock waves entering the room. To prevent lightning shock waves from invading the power transformation and distribution equipment, valve type lightning arresters can be installed at the inlet end of the line. The upper end of the valve type lightning arrester is connected to the overhead line, and the lower end is grounded.

During normal operation, the lightning arrester remains insulated from the ground; When the lightning shock wave arrives, the lightning arrester is broken down, introducing lightning into the earth. After the shock wave passes, the lightning arrester automatically restores its insulation state.

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