The lightning protection of the monitoring room is the core of the lightning protection of the monitoring system. It should be conducted in various ways from direct lightning strike protection, lightning intruding wave, equipotential bonding and surge protection.
1. As the monitoring room involves lightning protection of buildings, its direct lightning protection measures shall comply with the relevant provisions in GB50074-94 "Lightning Protection Design Code for Buildings". The lightning protection in the monitoring room can only effectively prevent lightning attacks by adopting a comprehensive lightning protection method. The building was built with lightning rods, lightning protection nets, etc. Therefore, we 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. It is best not to place monitoring equipment. On the top floor.
2. Since the main energy of the lightning intruding wave is concentrated from the tens of Hertz to the lower end of several hundred Hertz near the power frequency, the lightning intruding wave energy easily couples and resonates with the industrial frequency loop, and the lightning intrudes the wave from the power line. The probability of human electronics is much higher than the chance of entering from the signal line.
All cables entering the monitoring room should be buried. The metal threaded pipe should be connected to the ground network before entering the monitoring room. If overhead lines are used to introduce indoor metal hanging wires or metal objects, they should be grounded.
3. An equipotential connection busbar or metal plate is set in the monitoring room, and the equipotential connection busbar should be connected with lightning protection grounding of the building, PE line, equipment protection ground, antistatic grounding, etc. to prevent dangerous potential difference. Its grounding resistance value is determined by its towel minimum value. If there are special requirements, lightning protection grounding devices need to be set separately, the remaining three grounding should share a group of grounding devices, the grounding resistance should not be greater than the minimum value, a grounding grid isolator must be used between the two grounding devices to prevent grounding Potential counterattack. The required grounding resistance is less than 4 ohms. When the monitoring center uses a special grounding device, its grounding resistance must not exceed 4Ω. When using an integrated grounding grid, the grounding resistance must not exceed 1 Ω. The grounding wires of various arresters should be connected to the equipotential busbar with the straightest and shortest distances.
4. Surge protection in the monitoring room is to protect the equipment by providing over voltage protection to the power supply and signal lines entering the equipment room and connecting them to equipotential bonding. According to statistics, about 80% of lightning high-voltage is invaded from the power line, in order to ensure equipment safety, the general power supply is set on three levels of protection;
In the control of the building's main distribution cabinet, install the first-level reinforced power source lightning protection device. A second-level standard power source lightning arrester is installed at the distribution box of the monitoring system in the central control room. In the outdoor fixed camera, outdoor PTZ camera power supply population, install a standard power supply lightning protection device.
In the video transmission line, signal control line, intrusion alarm signal line before entering the front-end equipment or before entering the monitoring center console should be equipped with a corresponding lightning protection device.
The above are just some basic lightning protection measures. The real video surveillance system needs lightning protection 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 a basis, and in-depth in all aspects, the monitoring system can be protected from lightning strikes to the maximum extent and effectively achieve the purpose of lightning protection and disaster reduction.
1. As the monitoring room involves lightning protection of buildings, its direct lightning protection measures shall comply with the relevant provisions in GB50074-94 "Lightning Protection Design Code for Buildings". The lightning protection in the monitoring room can only effectively prevent lightning attacks by adopting a comprehensive lightning protection method. The building was built with lightning rods, lightning protection nets, etc. Therefore, we 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. It is best not to place monitoring equipment. On the top floor.
2. Since the main energy of the lightning intruding wave is concentrated from the tens of Hertz to the lower end of several hundred Hertz near the power frequency, the lightning intruding wave energy easily couples and resonates with the industrial frequency loop, and the lightning intrudes the wave from the power line. The probability of human electronics is much higher than the chance of entering from the signal line.
All cables entering the monitoring room should be buried. The metal threaded pipe should be connected to the ground network before entering the monitoring room. If overhead lines are used to introduce indoor metal hanging wires or metal objects, they should be grounded.
3. An equipotential connection busbar or metal plate is set in the monitoring room, and the equipotential connection busbar should be connected with lightning protection grounding of the building, PE line, equipment protection ground, antistatic grounding, etc. to prevent dangerous potential difference. Its grounding resistance value is determined by its towel minimum value. If there are special requirements, lightning protection grounding devices need to be set separately, the remaining three grounding should share a group of grounding devices, the grounding resistance should not be greater than the minimum value, a grounding grid isolator must be used between the two grounding devices to prevent grounding Potential counterattack. The required grounding resistance is less than 4 ohms. When the monitoring center uses a special grounding device, its grounding resistance must not exceed 4Ω. When using an integrated grounding grid, the grounding resistance must not exceed 1 Ω. The grounding wires of various arresters should be connected to the equipotential busbar with the straightest and shortest distances.
4. Surge protection in the monitoring room is to protect the equipment by providing over voltage protection to the power supply and signal lines entering the equipment room and connecting them to equipotential bonding. According to statistics, about 80% of lightning high-voltage is invaded from the power line, in order to ensure equipment safety, the general power supply is set on three levels of protection;
In the control of the building's main distribution cabinet, install the first-level reinforced power source lightning protection device. A second-level standard power source lightning arrester is installed at the distribution box of the monitoring system in the central control room. In the outdoor fixed camera, outdoor PTZ camera power supply population, install a standard power supply lightning protection device.
In the video transmission line, signal control line, intrusion alarm signal line before entering the front-end equipment or before entering the monitoring center console should be equipped with a corresponding lightning protection device.
The above are just some basic lightning protection measures. The real video surveillance system needs lightning protection 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 a basis, and in-depth in all aspects, the monitoring system can be protected from lightning strikes to the maximum extent and effectively achieve the purpose of lightning protection and disaster reduction.
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