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How thunderstorms strike security surveillance equipment from "thunderstorms"
With thunderstorms, how can security monitoring equipment be protected from lightning "attacks"? It is necessary for security and lightning protection product manufacturers and contractors to strengthen the awareness of lightning protection and to grasp the correct lightning protection methods.
With respect to lightning protection measures, there are two typical faults in the industry: First, install lightning rods on the security monitoring brackets. Some people think that installing a lightning rod on the monitoring bracket will lead the mine to the underground is the safest method, this method may be wrong! Outdoor isolated pole camera anti-radar should be set up with an independent lightning rod, pole and independent lightning rod distance should be greater than 4.5 Meters, the use of wood or cement insulation poles is more conducive to insulation, the camera bracket is best to use engineering plastic brackets to increase the level of insulation. Instead of directly installing lightning rods on security monitoring brackets, this is actually "lightning" rather than "lightning."
The second is improper grounding, providing a path for the ground potential intrusion security system, resulting in system damage. The multi-point grounding is suitable for strong electricity. In monitoring the weak electricity system, single point grounding can better protect the product. Artificially create a multi-point grounding of the security system and introduce the “grid ground potential†into the security system through the ground loop, causing a voltage “surgeâ€. The weak pressure of the weak current system is too low. At this time, the pressure difference is too large. If the system cannot withstand the damage, it will be devastating.
Increased awareness of mine defense in the industry
The above-mentioned seemingly simple lightning misunderstandings, why they occur frequently, is inseparable from the industry's lack of awareness of lightning protection. In previous years, Party A, as the subject of the project, had insufficient understanding of the lightning protection construction of the security equipment. They believed that after the completion of the construction of the entire system, there would be no problem to use it, and they did not realize the importance of lightning protection design to the entire system. Some of the security and anti-radar products manufacturers or mine protection engineering companies are unprofessional, or because of cost considerations, neglect the design of lightning protection, and indirectly increase the risk of lightning protection against lightning protection equipment. 
With the development of the security industry, especially the construction of safe cities and smart cities, more and more outdoor installations of security equipment, people's awareness of lightning protection of the monitoring system gradually increased. Especially in the Safe City project built on the BT and BOT models, the project company attaches particular importance to the construction of the system, as the engineering company must bear the corresponding responsibility in the event of a lightning failure in the warranty period. In addition, with the occurrence of lightning strikes in recent years, people's awareness of lightning protection has gradually increased. All of these have raised awareness of lightning protection design by Party A, security and lightning protection product manufacturers and engineering companies.
Common Problems in Installing Surge Protection Equipment in Surveillance Systems
Professional lightning protection product manufacturers or contractors will encounter the following problems when installing lightning protection equipment on the monitoring system:
First, grounding resistance is too large or not grounded "Video Security Monitoring System Engineering Design Specification" and "Building Information System Lightning Protection Technical Specifications" does not clearly specify the lightning resistance of the monitoring system grounding resistance. Generally, the grounding resistance of the design monitoring system is designed according to the resistance value of the computer room and the grounding resistance of the information system: the independent grounding is not greater than 4 ohms, and the joint grounding resistance is not greater than 1 ohm. Specifically speaking, the grounding resistance of the monitoring system can be appropriately increased according to different geological conditions. For example: Forest fire protection units, cameras must be installed on the ridge, the address is bluestone, there are no river ditches within 200 meters, there is no large-scale gravel, soil zone that can be excavated. At this time, if the ground of the monitoring system in this particular place is required to be no more than 4 ohms, and the cost is ten times or even several ten times of the monitoring system itself, then the appropriate increase in the grounding resistance should be selected, and the cable with the large flow rate should be used as the connection. Ground line.
Second, no direct lightning protection measures This situation is more common is the bolt camera, some people think that will have installed a three-in-one signal lightning arrester, grounding is also done, there should be no problem, but did not know the arrester is anti-induction The tools do not have much effect on direct lightning strikes. Direct lightning protection mainly depends on the equipment such as lightning rods, which changes the direction of operation of lightning, making it unlikely that lightning strikes the monitoring equipment directly. There is also a situation where a lightning rod is used to install the lightning rod. In this case, if the metal rod is well grounded, the dome camera itself has been protected, and there is no need to increase the cost and install the lightning rod.
Third, the signal arrester is too far away from the equipment to be protected If the arrester is installed too far from the equipment, there is no way to eliminate the lightning current induced on the communication line and the power supply line between the arrester and the front of the equipment. Therefore, it is recommended that the signal lightning arrester should be installed directly to the front end of the monitoring equipment, especially where the signal power lines go.
Fourth, the problem of grounding cable In order to save costs, often use the metal rod as the down conductor of the working grounding system, regardless of "right" and "no". According to the design, the metal rod is used as the direct lightning protection system to guide the off-line. At this time, the working ground is connected to the metal rod. If there is direct lightning, there is no voltage difference between the front end of the signal lightning arrester and the moment of the metal rod rod. The direct lightning will directly impact the lightning rod. Signal lightning arresters or power surge arresters can cause the arrester to age prematurely or be damaged on the spot. Therefore, it is recommended that the downline of work should be singled out.
Security and lightning protection products market capacity gradually expanded
With the improvement of people's awareness of security and lightning protection, the capacity of the lightning protection market is gradually expanding. According to the investigation and analysis of China's main application market for surge protection by the China Quality Association Lightning Protection Branch, the current surge protection industry is still in its infancy and has a relatively large market space. With only preliminary estimates, the annual market capacity exceeds RMB 14 billion. RMB Yuan, the lightning protection branch of the China Quality Association estimated the market capacity of surge protection products to be 1.5 billion. Where does this 1.5 billion market come from? According to the text, in 2008, there were more than 600 surveillance camera companies in China with an annual output of 15 million units. If 10% of surveillance cameras need to be equipped with surge protectors, the market capacity of surge protectors There are 1.5 billion yuan. In particular, in recent years, the construction of safe cities, road monitoring, and outdoor camera applications have gradually increased, which will further increase the market capacity of surge protectors. 
Recently, the National Bureau of Cultural Relics issued two standards, the “Requirements for the Protection of Museums and Cultural Relics Protection Units†and the “Technical Specifications for the Protection of Cultural Relics and Buildings,†which are mainly designed to combine two different industries, security and lightning protection, for standard construction. To raise the level of safety and prevention, and continue to develop towards standardization, which plays a significant role in promoting the requirements of lightning protection standards and the market development of products.
People's increasing emphasis on security has increased the awareness of security and lightning protection in recent years. For Party A and the engineering company, the awareness of lightning protection needs to be improved. At present, there are relevant national and industry mandatory standards for the design, construction and acceptance of lightning protection. It is recommended that Party A find a professional company to do lightning protection in the security system. After the system is put into use, it is necessary to maintain the appropriate devices and establish a management system. Arrange for the full-time personnel familiar with lightning protection technology to take charge of the maintenance of the system, conduct comprehensive inspections before the thunderstorm season and perform daily maintenance after each lightning weather. After a lightning strike accident occurred, the cause was investigated and the damage caused by lightning was promptly investigated, and improvement measures were proposed. Only in this way can the security equipment work better.
Two years ago, the huge pain caused by lightning strikes caused by the rear-end collision of Wenzhou's trains has been difficult to understand. At present, China has just entered the high season of thunderstorms, and lightning protection is particularly important. For the security industry, monitoring equipment lightning protection is imminent, especially for security and lightning protection products manufacturers and engineering companies, to grasp the correct lightning protection measures, protection of security monitoring equipment, to protect public safety is particularly important.