Composition <br> <br> monitoring system monitoring system consists of front-end system, the terminal system, the transmission system and the monitoring center. Front-end systems usually refer to front-end cameras (high-speed domes, PTZ camera guns, network cameras, and ordinary camera guns). If the cameras are distributed outdoors, they are the most vulnerable targets for lightning strikes. When lightning strikes a front-end system, they directly pass through the transmission. The system reached the monitoring center, causing serious damage to the monitoring center.
Lightning struck divided into two ways <br> <br> attacks struck by lightning raid into two ways, Watch thunder and lightning induction. As the name implies, thunder and lightning strikes directly on the camera. This type of lightning strike causes the most serious damage, but the probability of occurrence is relatively small. Inductive lightning is called secondary lightning. It is divided into electromagnetic induction and electrostatic induction. When the lightning hits the lightning rod, a momentary strong electromagnetic field will be generated around the connection line under the lightning rod. The monitoring device and the transmission line in the electromagnetic field will induce a large electromotive force, which is called electromagnetic induction. When a thunder cloud appears over the transmission line, the transmission line senses an opposite charge to the thunder cloud. This is called electrostatic induction. The damage caused by induced lightning is not directly damaged by direct lightning, but the chance of occurrence is very high. These two types of lightning attacks have also become two aspects of the surveillance system that need to be protected.
Measures to prevent lightning attacks <br> <br> prevent lightning from striking the network monitoring system in three ways, anti Watch lightning, thunder and lightning sensing and integrated anti-lightning. Anti-lightning and anti-induction lightning protection is a single lightning protection method. They all use a single lightning protection device to prevent lightning. Anti-lightning lightning devices mainly include lightning rods, lightning protection lines, lightning protection strips, and lightning protection nets. Induction lightning protection mainly uses arresters to prevent lightning attacks. Integrated lightning protection uses a variety of lightning protection devices to prevent lightning attacks on a single facility that needs protection.
The cameras of the surveillance system have two distribution modes, outdoor distribution and indoor distribution, and indoor distribution cameras are basically not attacked by direct lightning. Outdoor distribution of the camera may be subject to direct lightning strikes, to prevent outdoor distribution of the camera from lightning, it is best to install a lightning rod 3-4 meters around the camera, through the lightning conductor wire lightning into the earth. We also mentioned some lightning protection devices in front of us. These lightning protection devices are all oriented to a wide range of lightning protection and are not suitable here. The camera is connected to the monitoring center through the signal line of the transmission system. The signal line of the transmission system is set up in two ways, directly in the air and buried in the ground. The signal line buried in the ground can play a certain degree of lightning protection effect, but it is not 100% capable of lightning protection. It is also necessary to install the signal line into a metal pipe with a relatively large space, and install a grounding lightning protection device at the front end of the metal pipe. In order to effectively prevent lightning attacks. The signal line in the air is most vulnerable to direct lightning strikes, and it is also vulnerable to induced lightning attacks. Therefore, we need to install a lightning arrester at the front end of the signal line, and at the same time install a grounded lightning protection device at the support point of the support signal line in order to maximize the Limits limit the harm caused by lightning to the monitoring system.
The lightning protection of the monitoring center is the core of the entire monitoring system for lightning protection. Since the monitoring center involves lightning protection of buildings and lightning protection of monitoring equipment, only comprehensive lightning protection methods can effectively prevent lightning attacks. Buildings are equipped with lightning rods, lightning protection nets, etc., so we do not need to consider adding additional lightning protection devices to the buildings. It is important to note that we should not place monitoring equipment next to the windows, and it is best not to place monitoring equipment on it. Top floor. The outdoor monitoring facilities are mainly connected to the monitoring center through the signal line. Therefore, the lightning arrester should be installed at the access point of the signal line to prevent inductive lightning, and ground lightning protection devices must be installed to prevent direct lightning strikes. All the electronic devices in the monitoring center are preferably protected against lightning by lightning protection grounding devices, so that the security of the monitoring center can be fully protected. Finally, we need to pay attention to the fact that the resistance of the grounding device is minimized. The larger the grounding resistance is, the worse the lightning protection effect is, and the grounding resistance should be controlled within 4 ohm.
The above are just some basic lightning protection measures. Real monitoring system lightning protection needs to be comprehensively considered in all aspects, and the lightning protection technology is also very complex. The performance requirements for various lightning protection devices are also relatively high, but everyone can use the above The lightning protection method is used as the basis, and in-depth in all aspects, the monitoring system can be protected from lightning strikes.
Lightning struck divided into two ways <br> <br> attacks struck by lightning raid into two ways, Watch thunder and lightning induction. As the name implies, thunder and lightning strikes directly on the camera. This type of lightning strike causes the most serious damage, but the probability of occurrence is relatively small. Inductive lightning is called secondary lightning. It is divided into electromagnetic induction and electrostatic induction. When the lightning hits the lightning rod, a momentary strong electromagnetic field will be generated around the connection line under the lightning rod. The monitoring device and the transmission line in the electromagnetic field will induce a large electromotive force, which is called electromagnetic induction. When a thunder cloud appears over the transmission line, the transmission line senses an opposite charge to the thunder cloud. This is called electrostatic induction. The damage caused by induced lightning is not directly damaged by direct lightning, but the chance of occurrence is very high. These two types of lightning attacks have also become two aspects of the surveillance system that need to be protected.
Measures to prevent lightning attacks <br> <br> prevent lightning from striking the network monitoring system in three ways, anti Watch lightning, thunder and lightning sensing and integrated anti-lightning. Anti-lightning and anti-induction lightning protection is a single lightning protection method. They all use a single lightning protection device to prevent lightning. Anti-lightning lightning devices mainly include lightning rods, lightning protection lines, lightning protection strips, and lightning protection nets. Induction lightning protection mainly uses arresters to prevent lightning attacks. Integrated lightning protection uses a variety of lightning protection devices to prevent lightning attacks on a single facility that needs protection.
The cameras of the surveillance system have two distribution modes, outdoor distribution and indoor distribution, and indoor distribution cameras are basically not attacked by direct lightning. Outdoor distribution of the camera may be subject to direct lightning strikes, to prevent outdoor distribution of the camera from lightning, it is best to install a lightning rod 3-4 meters around the camera, through the lightning conductor wire lightning into the earth. We also mentioned some lightning protection devices in front of us. These lightning protection devices are all oriented to a wide range of lightning protection and are not suitable here. The camera is connected to the monitoring center through the signal line of the transmission system. The signal line of the transmission system is set up in two ways, directly in the air and buried in the ground. The signal line buried in the ground can play a certain degree of lightning protection effect, but it is not 100% capable of lightning protection. It is also necessary to install the signal line into a metal pipe with a relatively large space, and install a grounding lightning protection device at the front end of the metal pipe. In order to effectively prevent lightning attacks. The signal line in the air is most vulnerable to direct lightning strikes, and it is also vulnerable to induced lightning attacks. Therefore, we need to install a lightning arrester at the front end of the signal line, and at the same time install a grounded lightning protection device at the support point of the support signal line in order to maximize the Limits limit the harm caused by lightning to the monitoring system.
The lightning protection of the monitoring center is the core of the entire monitoring system for lightning protection. Since the monitoring center involves lightning protection of buildings and lightning protection of monitoring equipment, only comprehensive lightning protection methods can effectively prevent lightning attacks. Buildings are equipped with lightning rods, lightning protection nets, etc., so we do not need to consider adding additional lightning protection devices to the buildings. It is important to note that we should not place monitoring equipment next to the windows, and it is best not to place monitoring equipment on it. Top floor. The outdoor monitoring facilities are mainly connected to the monitoring center through the signal line. Therefore, the lightning arrester should be installed at the access point of the signal line to prevent inductive lightning, and ground lightning protection devices must be installed to prevent direct lightning strikes. All the electronic devices in the monitoring center are preferably protected against lightning by lightning protection grounding devices, so that the security of the monitoring center can be fully protected. Finally, we need to pay attention to the fact that the resistance of the grounding device is minimized. The larger the grounding resistance is, the worse the lightning protection effect is, and the grounding resistance should be controlled within 4 ohm.
The above are just some basic lightning protection measures. Real monitoring system lightning protection needs to be comprehensively considered in all aspects, and the lightning protection technology is also very complex. The performance requirements for various lightning protection devices are also relatively high, but everyone can use the above The lightning protection method is used as the basis, and in-depth in all aspects, the monitoring system can be protected from lightning strikes.
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