Fault Indicator Monitoring System Correct Selection And Use

Video monitoring system, the importance of lightning protection has been not taken seriously for the project, always feel that there is no problem with lightning protection, in some places a few times a year there is no lightning phenomenon, you can not do, but lightning often occur in the region, Fault Indicator Monitoring System must pay attention to lightning protection.

In order to take effective lightning protection measures to the safety monitoring system and ensure the normal and reliable operation of the monitoring system, it is necessary to clearly monitor the main causes of the lightning damage caused by the system and the possible intrusion of lightning, especially the outdoor monitoring equipment with severe lightning damage, On the basis of analyzing the cause of the damage, the correct selection and use of the lightning protection device of the monitoring system equipment, as well as research and discussion of signal, power line layout, shielding and grounding methods.

First, the composition of Fault Indicator Monitoring System and the cause of mine damage

1, the monitoring system components

Front part: camera, lens, PTZ, shield, bracket and other components.

Transmission part: the use of coaxial cable, cable, fiber, multi-core line to take overhead, buried or along the wall laying, etc. transmission of video, audio or control signals.

Terminal part: mainly by the storage device, monitor, control equipment and other components.

2, monitoring system Lei damage causes

Straight lightning: lightning directly hit the camera in the open air on the equipment damage; lightning directly hit the overhead cable caused by cable fusing.

Lightning wave intrusion: the monitoring of the power cord, signal transmission or into the monitoring room of the metal pipeline to the lightning or lightning induction, the lightning waves along the metal wire intrusion equipment, resulting in potential damage to the equipment.

Lightning induction: When lightning strikes, in the lead off the line will produce a strong transient electromagnetic field. In the electromagnetic field in the monitoring equipment and transmission lines will induce a larger electromotive force. This phenomenon is called electromagnetic induction. When there is a charged thundercloud, in the thunderclouds below the buildings and transmission lines will be reflected in the opposite of the Thunder and the charge. This induced charge in the low-voltage overhead lines up to 100kv,Fault Indicator Monitoring System the signal line can be 40-60kv. This phenomenon is called electrostatic induction. Electromagnetic induction and electrostatic induction is called induction mine, also known as secondary lightning. It is no damage to the equipment of the sudden lightning to the sudden, but it is much greater than the probability of direct lightning occurred.

Second, the integrated monitoring system lightning protection

1, front-end equipment lightning protection

Front-end equipment has two kinds of outdoor and indoor installation, installed in the indoor equipment is generally not subject to direct lightning, but need to consider to prevent lightning over-voltage equipment damage, while the outdoor equipment at the same time need to consider to prevent lightning.

Front-end equipment such as camera should be placed in the lightning protection device (lightning rod or other flashing conductor) within the effective protection range. When the camera is set up independently, the lightning rod is preferably 3-4 meters away from the camera. If there are difficulties in lightning rod can also be erected in the camera's support rod, lead down the line can be directly used metal rod itself or choose Φ 8 galvanized round steel. To prevent electromagnetic induction, along the pole lead the camera's power cord and signal lines should wear metal pipe shield.

Outdoor camera head lightning protection requirements: outdoor camera gun (with head) in the front of the encoder to be installed lightning protection device,Fault Indicator Monitoring System as an outdoor front-end equipment protection;

In order to prevent lightning waves from entering the front-end equipment along the line, install appropriate lightning arrester on each line before the equipment, such as power line (220V or DC12V), video cable, signal line and PTZ control line.