In the season of heavy rainfall, it is crucial for citizens to closely monitor weather warnings and understand basic safety measures. When orange or red storm warnings are issued, people outdoors should stay informed about heavy rain and traffic conditions, avoid high-voltage equipment such as power lines, towers, and transformers, and refrain from walking through flooded areas to prevent electric shocks from exposed wires. Even after a warning is lifted, it does not mean the danger has passed—those in regions prone to secondary disasters, like riverbanks and steep slopes, must still maintain strict safety precautions.
Shenzhen recently experienced its strongest one-hour rainfall in 60 years. It’s expected that convective weather will remain active in the near future. From noon on the 30th to noon on the 31st, large parts of Guangdong were hit by heavy rain. In Shenzhen, the morning of the 31st felt like dusk due to the intense downpour. After a brief break, the rain returned again. During the thunderstorm on the 30th, 9,119 lightning strikes were recorded within five hours. Two people were reported dead as a result of the disaster. According to meteorological reports, some areas saw over 114 millimeters of rain in just one hour, marking the highest hourly rainfall intensity in 60 years.
The occurrence of 9,119 lightning strikes during a single thunderstorm highlights the importance of taking severe weather seriously. From a security perspective, lightning protection for security equipment is a critical aspect of system design. Outdoor monitoring devices, especially those installed on tall structures, require enhanced lightning protection measures to ensure their reliability and safety.
**Lightning Protection Technology for Security Equipment**
A comprehensive security system includes front-end data collection devices, transmission lines, and back-end storage and monitoring centers. Each component requires tailored lightning surge protection strategies.
1. **Front-End Equipment Protection**
Front-end devices are typically divided into indoor and outdoor units. For outdoor equipment located far from buildings and outside the range of existing lightning protection systems, it is necessary to install dedicated lightning protection devices. However, if the equipment is already within the protective range of a building's lightning rod or conductor, direct lightning protection may not be required. To prevent induced lightning currents, power and signal cables should be routed through grounded steel conduits for shielding. Surge arresters should also be installed at the input of each line connected to the equipment. These arresters must be properly grounded, as improper grounding renders them ineffective.
It is important to note that isolated poles with cameras should have an independent lightning rod for protection. The camera pole must be placed within the effective coverage area of this rod, and the distance between the rod and the camera should be maximized to minimize the impact of magnetic fields from lightning discharge. The pole and mounting bracket should ideally be made of steel, which offers both strength and good electrical conductivity and shielding properties. Proper grounding (with low resistance) is essential for effective lightning protection. Indoor front-end equipment also needs protection against induced surges, and video surveillance systems can benefit from three-in-one or two-in-one surge protection products that safeguard power, video, and control signals.
2. **Transmission Line Protection**
Transmission lines, including signal and power lines, should be buried directly whenever possible, as overhead lines are highly susceptible to lightning strikes. If overhead installation is unavoidable, use high-quality shielded cables with dense copper mesh shielding and ensure the shielding is grounded. Try to route these lines along buildings but keep them away from lightning conductor conductors. Grounding should be done at each support pole, and both overhead cables and metal sheaths should be properly grounded. At the entry point of the building, an arrester should be installed for both signal and power inputs to protect downstream equipment.
3. **Back-End Storage and Monitoring Center Protection**
The building housing the monitoring center should be equipped with lightning rods, conductors, or networks to prevent direct lightning strikes. For induced lightning protection, all metal pipes entering the center should be connected to grounding systems. If overhead cables are used, an arrester should be installed at the entrance, and the cable’s metal sheath and self-supporting steel wire should be grounded. An equipotential connection box should be installed inside the monitoring center, with copper bars running along the walls under the anti-static floor. All grounding points—such as those for surge protectors, PE lines, equipment grounds, and static electricity—should be connected to the copper bar to eliminate potential differences. Use thick copper wires to connect surge protectors to the equipotential bar, ensuring the shortest and most direct path for grounding.
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