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Lightning Monitoring System Frequently Asked Questions <br> <br> a device, grounding resistance is too large or no grounding. The grounding resistance of the lightning protection system of the monitoring system is not clearly defined in the "Engineering Design Specification for Video Security Monitoring System" and "Technical Specifications for Lightning Protection in Building Information Systems". Generally, the grounding resistance of the design monitoring system is designed according to the resistance value of the computer room and the grounding resistance of the information system: the independent grounding is not greater than 4 ohms, and the joint grounding resistance is not greater than 1 ohm. Specifically speaking, the more different geological conditions can appropriately increase the grounding resistance of the monitoring system. For example, the forest fire protection unit must be installed on the ridge. The address is bluestone, there is no river ditches within 200 meters, and no excavation is possible. Large gravel, soil zone. At this time, if the ground of the monitoring system in this particular place is required to be no more than 4 ohms and the cost is ten times or even several ten times of the monitoring system itself, then the appropriate grounding resistance should be selected, and the cable with the large flow rate should be used as the connection. Ground line.
Second, no direct lightning protection measures, this situation is more common is the bolt camera, some people think that will have installed a three-in-one signal lightning arrester, grounding is also done, there should be no problem, but do not know the lightning arrester is mine The tool that conducts lightning and inductive lightning does not have any effect on direct lightning. Lightning damage to the electronic information system generally has several means: 1. Mechanical effects, such as a lightning strike on a tree, sometimes knock off the support of a big tree, mainly relying on the mechanical effect of a lightning strike. 2. Thermal effect: The instantaneous temperature of the lightning strike point can reach more than 3,000 degrees, so that the metal instantly melts. 3, electromagnetic effect, this is an invisible killer, it has contributed to the instantaneous high current electromagnetic induction equipment burned out. As long as the lightning protection is made by relying on the equipment of the lightning rod, the direction of operation of the lightning is changed so that the lightning is unlikely to hit the monitor directly. There is also a situation in which a lightning rod is installed on a curved ball machine. In this case, the metal rod itself will protect the dome, and there is no need to increase the cost and install the lightning rod.
Third, the signal arrester is too far away from the equipment to be protected. If the arrester is installed too far away from the device, there is no way to eliminate the lightning currents induced on the communication lines and the power lines after the arrester reaches the front of the device. Therefore, it is recommended that the signal lightning arrester should be installed directly to the front end of the monitoring equipment, especially where the signal power lines go.
Fourth, the problem of grounding cable, in order to save costs, often use the metal rod as the down conductor of the working grounding system, for the time being regardless of "to" and "no". In accordance with the design of the general metal rod as direct lightning protection system downlead, this When the work place is connected to a metal rod, if there is a direct lightning strike, there is no voltage difference between the front end of the signal lightning arrester and the moment of the metal rod body, which means that your direct lightning will directly hit the signal lightning arrester or the power lightning arrester, which will make the arrester ahead of schedule. Aging or damaged on the spot. Therefore, it is recommended that the downline of work should be singled out.
Five, three in one surge protector (or BNC surge protector) choice, according to the specific circumstances of the market, and time installation experience point of view, BNC signal electrophoresis protector is set for a long time in the scope of lightning protection, this The protection of the monitor is far from enough. For the monitor, there are surges, spikes, and burrs, which may cause surges, spikes, and burrs that may be nearby large-scale power tools. Starting or shutting down, there are changes in nearby electromagnetic fields, etc. These not only require the protection of pressure sensitive or discharge tubes, but also require a logic filter circuit to provide the monitor with a safer electrical environment. As the latter factor was ignored.
Lightning protection is a complex issue. The lightning protection design of the safety monitoring system not only depends on the performance of the lightning protection device, but more importantly, the geography of the monitoring system must be taken into account before the design and construction of the monitoring system. Environment, design suitable cable deployment methods, shielding and grounding methods. In short, lightning protection design should be considered comprehensively to achieve good results.
Lightning protection security concerns Twelve major monitoring lightning protection knowledge derived reading 1, lightning overvoltage has two basic forms:
One is: direct lightning - also known as direct lightning is two: lightning induction - also known as induction lightning 2, the role of the lightning receptor:
The lightning receptor is a metal body used to receive lightning strikes. It must be connected to the grounding device via a ground lead.
3, the function of lightning rod:
The role of the lightning rod is actually the role of lightning, it is used to protect the direct lightning.
4, the use of lightning arresters and functions:
Commonly used surge arresters are valve type, exhaust type (pipe type), zinc oxide and so on.
The lightning arrester is used to protect the lightning voltage from invading the power distribution room or other buildings along the line so as not to jeopardize the insulation of the protected object. Nowadays, zinc oxide surge arresters are often used outside the power distribution room, and valve arresters are often used indoors.
5, lightning protection measures commonly used in the factory's power distribution room:
Protection against direct lightning The use of lightning rods (or lightning conductors, lightning conductors, and lightning protection nets) is a lightning arrester.
6, the concept of safe current:
Safe current refers to the maximum current that the human body can get out of after getting an electric shock. The safety current in our country is 30 mA (50HZ). The safety current is related to the time of the shock, the nature of the current, the current path and the weight and health status.
7, the concept of safe voltage:
The voltage in the safety zone refers to the voltage that does not cause direct death or disability. Our safety extraordinarily low voltage is 36 volts.
8, the concept of land:
Electrical ground (or ground) refers to a place where the potential is zero; this ground generally refers to a place about 20 meters away from the ground fault point.
9, contact voltage, step voltage:
The contact voltage refers to the voltage to ground that is exposed by exposed conductive parts of a device that touches a ground fault; the step voltage refers to the potential difference between the two legs when a person walks near a ground fault point.
10, the concept of working grounding, protective grounding:
In order to ensure that the power system and equipment meet the requirements for normal operation, grounding is called working grounding.
The grounding for protection of personal safety against contact with electricity is called protective grounding.
For example, the grounding of the neutral point of the transformer, the grounding of the lightning arrester and the arrester is the working ground. Transformer secondary terminal grounding, device housing grounding for protective grounding.
11, at present, China's several protective grounding methods:
TN system; TT system; IT system;
Which in the TN system is divided into: TN-C, TN-S, TN-CS and other three protective grounding methods.
12, equipotential bonding: equipotential bonding can be divided into total equipotential bonding, auxiliary equipotential bonding:
The purpose of this practice is to connect conductive metal objects that people may come into contact with the PE wire directly. Both internationally and in China stipulate that the total equipotential bonding shall be implemented at the entrance to the power cord, that is, all the metal components and pipelines near the power cord entering the home are connected with the PE wire. In places where there is a particularly high humidity and danger of electric shock (such as a bathroom), auxiliary equipotential bonding must also be carried out. That is to say, all the metal components and pipes in the site are connected to PE lines.
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The grounding system is composed of grounding body, grounding lead-in wire, grounding disk or grounding busbar and grounding wiring. The resistance of the grounding system is mainly determined by the resistance of the soil near the grounding body. If the soil resistivity is high and the grounding resistance cannot reach the requirement of less than 4 ohms, an artificial method of reducing the grounding resistance must be used. For the lightning protection of the surveillance system, it can be said to be a more complex issue, not only the protection of outdoor monitoring equipment, but also consider the lightning protection problems of transmission cables and monitoring centers.