Three questions about lightning protection of buildings

Q: Which buildings are more vulnerable to lightning strikes?
Answer: The development of modern architecture is changing with each passing day. With the application of new construction materials and the continuous emergence of high-rise and super-high-rise buildings, people's awareness of lightning protection in buildings is also gradually strengthened, and various lightning protection technologies are also developing in a diversified direction. From ancient times to the present, construction lightning strikes in our country are numerous. It is very important to understand the law of lightning strike accidents. Only by mastering the law can lightning protection design achieve good results. On a thunderstorm day, thunderclouds in the sky and objects on the ground have different charges. When the charges accumulate to a certain degree, electric field distortion will occur and lightning strikes will occur. But if there is no strong enough upstream leader somewhere on the ground, the lightning will not hit that place.
Generally speaking, buildings near lakes, ponds, and rivers are susceptible to lightning strikes, tall and prominent buildings and metal-roofed buildings are also prone to lightning strikes, and TV common antennas, flagpoles, and tall ancient trees often cause disasters. These areas and buildings should be the key lightning protection areas.
Question: What are the lightning protection facilities for buildings?
Answer: Lightning protection facilities for buildings include three parts: direct lightning, side lightning and induction lightning. Direct lightning is the part of the sky that the lightning strikes the building; side lightning is the part of the sky below the surface of the building. , The part above the ground; the direct lightning and side lightning protection facilities are mainly to protect the building itself from damage, and to reduce the various impacts on the internal space of the building when the huge lightning current is discharged into the ground along the building during lightning strike; Induced lightning is the lightning pulse generated on the various metal pipes entering the building when the thundercloud self-flashing, inter-cloud flashing, and cloud-to-ground flashing. The protection facilities for inductive lightning limit this kind of lightning pulse. Function to protect the safety of various electrical equipment in the building.
If a building's lightning protection facilities lack a certain part of these three major parts, the building's lightning protection capacity is inherently insufficient, and it will inevitably leave a permanent threat of lightning strikes, which will cause life and property (especially communications, computers, program control) Modern equipment using MO8 devices such as telephones, televisions, and stereos) poses a serious threat.
The lightning protection system of a building is a lightning receptor composed of lightning rods, lightning protection nets (bands) or a mixture, a down device composed of columns, beams, plate reinforcement or external down wires of the main structure, and the use of a foundation natural grounding body (pile The grounding device composed of foundation, ground beam, bearing platform or floor reinforcement) or artificial grounding body is synthesized, and the whole building forms a Faraday cage, which introduces lightning current into the ground.
Question: What should be paid attention to when designing and installing lightning protection devices?
Answer: Building lightning protection should have a whole concept. The so-called overall concept means that when designing and installing lightning protection devices, there must be an overall concept of the inside and outside of the building. The inside and outside of the building here refers not only to the internal lightning protection device and the external lightning protection device.
The overall concept inside the building refers to the overall unified consideration of the internal lightning protection device and the external lightning protection device during design and installation; the overall concept outside the building refers to the requirements for a courtyard, a community and the surrounding environment Make a comprehensive lightning protection plan, while not violating the requirements of the community plan. For example: whether the installed lightning rod tower affects the aesthetics of the community, whether the lightning rod, lightning belt or lightning net used matches the facade of the building and whether the low buildings are protected by the lightning protection devices on tall buildings or tall chimneys and many more. The grounding device must also be considered in a unified manner, for example, whether the buildings that are close to each other can share the grounding body, whether the underground pipe network can use a part of the grounding body, and whether the grounding device can be integrated for the future in a compound or community Create conditions for equipotential bonding, etc.

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June. 01 , 2020