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Why Should Lightning Protection Facilities Be Inspected Annually?

Time: 2023-08-07 Hit: 3

In recent years, lightning disaster has become one of the more serious natural disasters. Some people think that thunderstorms are a small probability event, and there is no need to detect lightning protection devices every year. However, the performance of the lightning protection device is directly related to the safety of lightning protection.

When it comes to lightning protection devices, people naturally think of lightning rods. In fact, from the perspective of lightning protection technology, modern lightning protection facilities include two parts: external lightning protection (direct lightning protection of buildings or facilities) and internal lightning protection (protection of lightning electromagnetic pulse). The main purpose of the system is to protect the building itself from fire accidents and personal safety accidents caused by direct lightning strikes; while the internal lightning protection system is to prevent damage caused by lightning wave intrusion, lightning induced overvoltage and system operation overvoltage intrusion into equipment.

The external lightning protection device is the so-called direct lightning protection technology, mainly based on lightning rods, lightning protection belts, lightning protection nets, and lightning protection lines, among which lightning rods are common direct lightning protection devices. When the thundercloud discharge is close to the ground, it distorts the electric field on the ground. At the top of the lightning rod, a space where the local electric field intensity is concentrated is formed to affect the development direction of the lightning leader discharge. The monitoring camera guides the lightning to discharge to the lightning rod, and then leads down through the ground The lightning current is introduced into the earth by the wire and the grounding device, so that the protected object is protected from lightning strikes.

First of all, let's take a look at the composition of the lightning rod. The lightning rod is mainly composed of three parts: the lightning receptor, the down-conductor and the grounding device. The connection between the three should be good, and the grounding resistance should meet the requirements in order to achieve the role of lightning protection. Although the lightning rod is dubbed the word "lightning protection", it only means that it can prevent the protected object from being struck by lightning. Naturally, its performance has also been tested; in addition, it has been subjected to severe cold and heat such as wind, sun, rain, and frost all year round, as well as rust and corrosion, which often lead to breakage, corrosion, severe corrosion, poor contact, and even connections between the three parts. In the event of an interruption, such a lightning protection device will not only fail to protect against lightning, but will aggravate the potential danger of lightning hazards.

Secondly, in the process of building maintenance, renovation, decoration, etc., some units and construction workers do not pay attention to protecting their lightning protection belt (network), causing man-made damage, and some accidentally cut off the grounding device during construction, causing the down conductor to break etc., will bring lightning protection security risks.

Thirdly, some units have weak awareness of lightning protection safety, do not understand the performance of lightning protection devices, and randomly pull and connect other electrical lines on lightning protection devices. These electrical lines often become the "culprit" of inductive lightning strikes for various electronic equipment in the building.

In addition, the internal lightning protection measures of buildings are mainly lightning protection devices and video monitoring two-in-one lightning protection devices for various electronic and electrical equipment to prevent induction lightning. Because the materials used are mainly zinc oxide piezoresistive elements and other electronic After being subjected to one or more repeated induction lightning strikes, the performance of these lightning protection devices will be significantly reduced or deteriorated and attenuated. Therefore, the lightning protection device must also be inspected regularly, and problems can be found through inspection for timely repair or replacement.

Some flammable and explosive places such as petroleum and chemical industry, and densely populated public places such as financial institutions, computer systems of enterprises and institutions, and schools, should regularly hire professional institutions with testing qualifications to conduct testing to ensure the normal use of lightning protection devices and achieve Take precautions.

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