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Lightning protection measures of wireless video surveillance solutions
Everyone knows that the wireless monitoring system consists of the following three parts:
1. Front-end part: mainly composed of camera, lens, pan-tilt, protective cover, bracket, decoder, etc., video encoder (broadcast and television-level video transmission application).
2. Transmission part: enable wireless video transmission equipment to transmit video, audio or control signals, etc.
3. Terminal part: mainly composed of picture splitter, monitor, control equipment, video storage equipment, etc.
Therefore, it is not only the wireless bridge of the wireless device that does the lightning protection of the wireless monitoring system, the power supply part of the device, and the front-end camera and all outdoor equipment are recommended to do lightning protection. Below we explain in detail the lightning protection of the three parts of the wireless monitoring system:
1. Lightning protection of front-end equipment: The front-end equipment has two distribution modes: outdoor and indoor. The indoor distribution is generally not subject to direct lightning strikes, but it should be considered to prevent the lightning overvoltage from invading the equipment, and the outdoor equipment needs to be considered at the same time. Direct strike lightning.
Front-end equipment such as cameras should be placed within the effective protection range of the lightning rod. For the front-end equipment that is already within the protection scope of other lightning rods or the original lightning protection system of high-rise buildings, direct lightning protection is generally no longer considered; for the front-end equipment that is not within the protection scope of any lightning protection system, direct strike should be considered Lightning protection problem.
2. Wireless video lightning protection: More than half of the lightning damage incidents in wireless monitoring systems are caused by the overvoltage of lightning intrusion waves induced on the lines connected to the system. Therefore, the protection of the lines connected to the system is a part of the overall lightning protection that cannot be ignored. The wireless bridge microwave system mainly transmits signal lines and power lines, and the lightning protection of these two parts can protect wireless monitoring equipment.
3. Lightning protection of terminal equipment: The lightning protection of the monitoring room is the core of the lightning protection of the monitoring system. It should be carried out from direct lightning protection, lightning intrusion wave, equipotential connection, and surge protection.
Regardless of whether it is the front end, transmission, or terminal part, we need to do a good part of the lightning protection, which can not be ignored, that is, the lightning protection and surge protection of the power supply system. In the case of lightning strikes, which are usually not direct lightning strikes, most of the equipment is damaged. It is caused by the induced voltage through the power supply and the data cable part causing the circuit of the equipment interface part to be damaged. All equipment housings, brackets, poles, and power grounding terminals should be connected to a common grounding equipotential terminal. Make sure that the grounding terminal of the power supply of all equipment shells and the grounding resistance are less than 5 ohms. In this way, when the device encounters a non-direct lightning strike, the induced voltage of the cable will be led to the ground through the common ground terminal of the casing. Avoid equipment damage. Ensure the stable operation of the equipment.
The main equipment of the monitoring room includes the monitoring center computer, video matrix, hard disk recorder, intercom system, and monitoring room power supply.
The location of the monitoring system equipment room should be selected in the top three floors of the building; when the size of the lightning protection grid on the sky surface of the building does not meet the system anti-interference requirements, a shield layer should be installed on the sky surface. Use unshielded cables. Before entering the house, wear metal pipes and bury them in the ground with a horizontal distance of more than 10 meters. If restricted by conditions and unable to bury the metal pipe into the house, the length of the house shield pipe or trestle should be lengthened. Both ends of the metal pipe or trestle and the junction of the lightning protection zone should be connected to the equipotential and ground. When the monitoring system equipment is a metal shell, it should be connected to the equipotential bonding band with the shortest possible wire.
If it is a non-metallic enclosure, when the shielding of the building where the device is located does not meet the electromagnetic compatibility requirements of the device, a metal mesh or other shielding body should be installed to shield the device. The equipment of computer, communication and monitoring equipment room shall be protected about 1 meter from the outer wall of the building. In order to prevent the building from being subjected to direct lightning, it will leak into the ground along the outer wall and generate a strong electromagnetic field around the downline to damage the microelectronic equipment.
It is very necessary to establish a complete lightning protection system, so as to ensure the stable operation of our wireless monitoring system and prevent future troubles in subsequent maintenance.