With the advancement of science and technology, people are more and more inclined to be smart about security products. Not only do they need to be functional and beautiful, but they also need to be full of “intelligence”, which can be described as “showing outside the world”. Security surveillance cameras are often vulnerable to damage during the thunderstorm season. As a result, lightning protection is receiving widespread attention and gradually forms a market trend. The following is a brief understanding of how lightning protection and lightning protection are misunderstood and the common problems in the lightning protection process.

Buy a surveillance camera, how to prevent thunder?

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 intensify their awareness of lightning protection and 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 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 “surge”. The weak pressure of the weak current system is too low. At this time, the pressure difference is too large. Once the system fails to 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. Due to the lack of understanding of the lightning protection construction of security equipment, the importance of lightning protection design to the entire system was not realized. Some of the security and anti-radar products manufacturers or mine protection engineering companies are unprofessional, or for 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, there are more and more outdoor installations of security equipment, and people’s awareness of lightning protection in the monitoring system has 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 the awareness of lightning protection products manufacturers and engineering companies on lightning protection design.

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:

One, grounding resistance is too large or not grounded

The grounding resistance of the lightning protection system of the monitoring system is not clearly defined in the "Engineering Design Specification for Video Security Monitoring System" and "Technical Specifications for Lightning Protection in Building Information Systems". The grounding resistance of the design monitoring system is generally done 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 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 do not know the arrester is a tool to prevent lightning, for the direct hit the thunder did not How much effect. Direct lightning protection mainly depends on the equipment such as lightning rods, which changes the direction of operation of the lightning, making it unlikely that lightning strikes the monitoring equipment directly. There is also a situation where a lightning rod is used to install a lightning rod. In this case, if the metal rod is well grounded and the dome is protected, it is not necessary 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 away from the device, there is no way to eliminate lightning currents induced on the communications lines and power lines of the arrester to the front of the device. Therefore, it is recommended that the signal lightning arrester should be installed directly on the front of the monitoring equipment, especially where the signal power lines go.

Fourth, the issue of grounding cable

In order to save costs, the metal rod is often used as the down conductor of the working grounding system, regardless of whether it is "right" or "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 place 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. 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 aimed at combining two different industries, security and lightning protection, to carry out standardized 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 engineering companies, 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 professional companies be responsible for lightning protection in the security system. After the system is put into use, it is necessary to maintain the corresponding 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 arrives, and conduct routine 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.

In addition to choosing a regular manufacturer of lightning protection cameras, it is also necessary to spend a lot of time on the installation. For example, installing lightning rods and embedding lightning protection modules in the power supply. This has multiple protective measures, lightning protection will be better.