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Nowadays, in lightning protection engineering projects, lightning protection has become one of the important tasks of security system design, construction, inspection, and acceptance. Especially for outdoor construction projects, the lightning protection must be carefully done according to the standards. Now the focus of lightning protection is gradually shifted to weak current lightning protection. As a part of weak current, the security system is applied to more and more modern lightning protection technologies. At the same time, it puts forward higher requirements for lightning protection technology and promotes the development and progress of modern lightning protection technology.
Modern security system equipment is basically electronic products. Among them, these electronic equipments are very sensitive to disturbances such as lightning overvoltage, electrostatic discharge, electromagnetic radiation, etc., and are easily damaged. In addition, nowadays a large number of networks are used to control and use outdoor equipment, and the harm of lightning strikes is becoming more and more obvious. In the design and construction process, it is necessary to specify the corresponding lightning protection solution according to the system characteristics of each security project, and effectively improve the overall lightning protection level of the security system.
For the application of lightning protection in the security construction process, it is mainly necessary to do three aspects of construction: power system protection, outdoor equipment protection and system grounding.
For the protection of the power supply system in security engineering, three levels of protection are required. The first level protection SPD is installed in the main power distribution box; the second level lightning protection SPD is installed in the power distribution box of the computer room; the third level protection SPD is installed in the computer room The power end of the device. Under normal circumstances, the first and second level of the power supply system have been set, as long as the third level of protection is sufficient during the construction process. Through the three-level protection of the power system, it can fully prevent the lightning current from entering the equipment room along the power line to prevent the device from being struck by lightning.
Second, outdoor equipment should be protected against direct lightning strikes and induced lightning. Generally encountered in the construction is the lightning protection of the outdoor camera. A small lightning rod needs to be installed on the support rod. For the power supply, control line and video line of the camera, lightning protection devices are installed separately, or three-in-one is used. Lightning protector provides comprehensive protection of the three signals. The ground wires of various types of lightning protectors are connected to the ground network below.
Third, according to the principle of voltage equalization and equipotentiality, the work, protection, shielding, and lightning protection grounding of the building are connected to the equipotential and grounded to prevent the overvoltage caused by the rise of the ground potential due to lightning strikes.
By installing lightning protection measures such as lightning protection on the cable, the protected circuit can be connected to the equipotential system in a very short time, so that the equipotential of each port of the security system equipment is equal, and a large amount of lightning in the system The pulse energy is discharged to the ground to reduce the potential difference of each port of the equipment, which can effectively protect the system equipment.
From the lightning protection theory and engineering experience, the lightning protection of the security system is a systematic project. In the design process, it is necessary to consider a complete solution from many aspects such as direct lightning protection, equipotential bonding, reasonable wiring, and installation of SPD. Ignoring any of these links may bring serious safety hazards to the entire project. During the construction process, it is necessary to strengthen the lightning protection awareness of the project construction personnel, install and construct in strict accordance with the relevant construction process standards and design documents, and try to reduce the system caused by lightning in all aspects through perfect design and good construction. loss.
Regarding measures to strengthen lightning protection, it is mainly to strictly abide by relevant national laws and regulations during the implementation of the project. From tendering to acceptance, system lightning protection should be considered, and system users should understand the hazards of lightning to the security system through various channels. And provide sufficient financial support. The system design and construction party shall carry out comprehensive lightning protection design and construction according to the probability of the system being subjected to lightning and the importance of the equipment.