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External lightning protection devices, also known as direct lightning protection technology, are mainly lightning rods, lightning protection strips, lightning protection nets, and lightning protection cables. Lightning rods are the most common direct lightning protection devices. When the thundercloud discharge is close to the ground, it distorts the ground electric field. At the top of the lightning rod, a space of local electric field intensity concentration is formed to affect the development direction of the lightning lead discharge, guide the lightning discharge to the lightning arrester, and then pass through the ground down conductor and ground. The device introduces lightning currents into the earth so that protected objects are protected from lightning strikes.
Isn't it easy to install a lightning protection device?
First of all, let us understand the structure of the lightning rod. The lightning rod is mainly composed of three parts: a lightning arrester, a down conductor, and a grounding device. The connection between the three should be good, and the grounding resistance must meet the specifications to achieve the lightning protection. Although the lightning rod has been given the word “arrestingâ€, it simply means that it can protect the protected object from the harm of lightning. In contrast, it is the opposite of “lightning the thunderbolt†and is exposed to thunderstorms. Its performance is naturally "tested." In addition, the trials of weather, heat, rain, frost, etc., which have been subjected to wind, sun, rain, and frost all year round, as well as corrosion and rot, often lead to the occurrence of breakage, corrosion, severe corrosion, poor contact, and even breakage between the three parts. Lightning devices not only do not protect against lightning, they may also become lightning strike devices, which in turn increase the potential danger of lightning hazards.
Secondly, in the process of maintenance, renovation, and decoration of buildings, some units and constructors do not pay attention to the protection of their lightning protection belts (nets), resulting in artificial damage, and some accidentally cutting off the grounding device during construction. Line breakage, etc., will bring security risks.
In addition, some units are indifferent to lightning safety awareness, and do not understand the performance of lightning protection devices, and randomly pull on the lightning protection devices and indiscriminately connect other electrical circuits such as telephone lines, broadcast lines, television receiving antennas, and overhead low-voltage lines. These electrical circuits are often the "culprit" of lightning induced by various electronic devices in buildings. These natural and man-made damages have caused huge hidden dangers to the lightning protection devices. Once lightning strikes, the consequences are disastrous.
In addition, the building interior lightning protection measures are mainly used for lightning protection devices for various kinds of electronic and electrical equipment against lightning induction. Because the materials used are mainly zinc oxide varistor elements and other electronic components, these lightning protection devices are suffering from After one or more repeated induced lightning strikes, its performance is significantly reduced or deteriorated, so regular inspections must also be carried out to detect problems that can be promptly repaired or replaced. According to the annual inspection (spot check) data of the author's unit, the passing rate of lightning protection devices is only about 80%.
Therefore, some flammable and explosive places such as petroleum and chemical industry, and densely populated public places such as financial institutions, computer systems and schools of enterprises and institutions, etc., can do well in the routine maintenance and inspection of the lightning protection devices of their own units. Qualified professional organizations conduct regular performance safety inspections to ensure their normal performance and prevent unburned.
As for the annual inspection of the lightning protection facilities, it is necessary to pay attention to what the technicians of Zhengzhou Leidi Electronic Engineering Co., Ltd. mentioned here. If you need to know more, please contact us.
Mentioned lightning protection devices, people naturally think of lightning rods. In fact, from the perspective of lightning protection technology, modern lightning protection facilities include external lightning protection (direct lightning protection of buildings or facilities) and internal lightning protection (protection of lightning electromagnetic pulses). The external lightning protection system is mainly In order to protect the building itself from direct lightning strikes and fire accidents and personal safety accidents; and internal lightning protection system is to prevent the intrusion of lightning waves, lightning induced voltage and system operation over-voltage intrusion caused by equipment damage. Lightning protection facilities need to pay attention to what? Next, Zhengzhou Leidi Electronic Engineering Co., Ltd. technical personnel to tell everyone.
January 07, 2024