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How to prevent the security monitoring system from being struck by lightning

by:Keyable     2021-08-01
How to prevent the security monitoring system from being struck by lightning   Monitoring front-end grounding and lightning protection   1. Outdoor cameras should be equipped with lightning rods, and independent grounding pipelines should be used to isolate the power and image signals of the monitoring equipment to avoid interference currents and line damage. The lightning rod should be erected higher than the camera, and within the virtual three-dimensional cone of 45-60 degrees down from the lightning rod tip, it is the safe range of the camera. When the lightning rod is installed, it should be insulated and isolated from the steel structure that fixes the camera. Chengdu security monitoring.  2. The grounding of the camera front-end equipment should be concentrated on a grounding bus at the terminal part, so that the grounding of the entire monitoring front-end equipment meets the requirement of no potential difference to the ground, otherwise it may cause a potential difference to the ground loop and cause the equipment to burn. 3. The indoor front-end camera should be grounded to the grounding terminal of the shared end, and a non-fuse circuit breaker and a leakage circuit breaker of suitable capacity should be installed on the power supply end of the front-end equipment. At the same time, a lightning arrester capable of withstanding 3000KV should be installed under the budget. Avoid being damaged by induced thunder or conduction thunder.  4. After the grounding of the outdoor camera is completed, the grounding resistance should be tested to be less than 10Ω, and the grounding rod should be installed in a three-point impedance test according to the standard. Grounding and lightning protection of the transmission part 1. Because some monitoring signals in the energy industry have long transmission distances and low voltage resistance, they are easy to be invaded by induced lightning and conducted lightning current and damage the equipment. In order to transfer the lightning current from the signal transmission line to the ground, the cable Surge protectors should be installed, and the signal transmission rate and voltage balance and grounding must be considered when designing the image signal transmission cable to avoid the intrusion of induced lightning.   2. Outdoor transmission and cables should have good grounding, and the grounding resistance must be less than 10Ω.   3. Overhead self-sustaining signal or power cables should connect the self-sustaining steel cable in a fixed section with a grounding wire to the Earth Chengdu security monitoring.  4. The control signal transmission line adopts a cable with isolation and shielding function.   5. The cables of the transmission part shall be buried as far as possible in the line erection. When the environmental conditions do not permit, the shortest spacing can be used to avoid the reduction of pressure resistance and lead to intrusion of induced lightning.   Monitoring terminal grounding and lightning protection   1. In the security monitoring system, the lightning protection measures at the monitoring terminal should be prudent, and various possible types of lightning intrusion, potential difference to the ground loop, and power supply surges should be considered.  2. The building where the monitoring terminal is located should be equipped with a lightning protection system, grounding grid and grounding terminal, etc. Chengdu security monitoring.   3. Various metal pipelines of the monitoring terminal should be grounded and connected to the grounding device together. When the cable enters the terminal room, the metal outer sheath of the cable and the self-supporting cable steel cable part should be connected to the ground terminal.  4. The indoor terminal transmission and cables should have better grounding. The grounding resistance must be less than 10Ω, but the lower the ground impedance value, the better.
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