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With the rapid popularization and application of security monitoring systems in the management of banks, transportation, communities, and warehouses, the possibility of destruction of surveillance system equipment due to lightning strikes has greatly increased. The consequences may cause the entire monitoring system to malfunction and cause economic losses that are difficult to estimate.
In order to adopt effective lightning protection measures for the security monitoring system to ensure the normal and reliable operation of the monitoring system, it is first necessary to specify the main reasons for the damage to the monitoring system from lightning strikes and the possible intrusion paths for lightning, especially the outdoor monitoring equipment with severe lightning damage. Based on the analysis of the causes of damage, the correct selection and use of lightning protection devices for monitoring system equipment will play a good role in improving the lightning protection capability of the monitoring system and optimizing the lightning protection level of the system.
Direct lightning: lightning strikes the open camera directly to cause equipment damage; lightning strikes the overhead cable and causes the cable to blow.
Lightning wave intrusion: When a CCTV power line, signal transmission line, or metal pipe entering a monitoring room is struck by a lightning or is induced by lightning, a lightning wave intrudes into the device along these metal wires, causing a potential difference to damage the device.
Lightning induction: When a lightning strikes a lightning rod, there will be a strong transient electromagnetic field around the deflector. Monitoring equipment and transmission lines in the electromagnetic field will induce a large electromotive force. This phenomenon is called electromagnetic induction. When a charged lightning cloud emerges, the charge opposite to the thundercloud is induced on the buildings and transmission lines below the thundercloud. This induced charge can reach 100kv on low-voltage overhead lines and 40-60kv on signal lines. This phenomenon is called electrostatic induction. Electromagnetic induction and electrostatic induction are collectively referred to as induction mines. They are also called secondary mines. Its damage to the equipment is not directly hit by the thunder, but it is much more likely to occur than direct lightning.
In order to adopt effective lightning protection measures for the security monitoring system to ensure the normal and reliable operation of the monitoring system, it is first necessary to specify the main reasons for the damage to the monitoring system from lightning strikes and the possible intrusion paths for lightning, especially the outdoor monitoring equipment with severe lightning damage. Based on the analysis of the causes of damage, the correct selection and use of lightning protection devices for monitoring system equipment will play a good role in improving the lightning protection capability of the monitoring system and optimizing the lightning protection level of the system.
Direct lightning: lightning strikes the open camera directly to cause equipment damage; lightning strikes the overhead cable and causes the cable to blow.
Lightning wave intrusion: When a CCTV power line, signal transmission line, or metal pipe entering a monitoring room is struck by a lightning or is induced by lightning, a lightning wave intrudes into the device along these metal wires, causing a potential difference to damage the device.
Lightning induction: When a lightning strikes a lightning rod, there will be a strong transient electromagnetic field around the deflector. Monitoring equipment and transmission lines in the electromagnetic field will induce a large electromotive force. This phenomenon is called electromagnetic induction. When a charged lightning cloud emerges, the charge opposite to the thundercloud is induced on the buildings and transmission lines below the thundercloud. This induced charge can reach 100kv on low-voltage overhead lines and 40-60kv on signal lines. This phenomenon is called electrostatic induction. Electromagnetic induction and electrostatic induction are collectively referred to as induction mines. They are also called secondary mines. Its damage to the equipment is not directly hit by the thunder, but it is much more likely to occur than direct lightning.
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