More and more people begin to pay attention to the summer thunderstorm losses for monitoring products, shenzhen kung fu security statistics thunderstorm every year to the economic consequences of the security products also has several hundred million by conservative estimates, the reasonable increasing lightning protection equipment is the only solution. Can you see the picture of the CCD camera of the following lightning strike?
Recently, heavy rains have been falling across the country, causing frequent lightning casualties. Lightning strikes two years ago caused the wenzhou bullet train rear-end injuries are still hard to forget, China has just entered the thunderstorm season, lightning protection is particularly important. For security industry, monitor equipment lightning protection is imminent, especially for security lightning protection products manufacturers and engineering business, to master the correct lightning protection measures, for the protection of security monitoring equipment, appear especially important to protect the safety of the public.
When a thunderstorm strikes, how can security monitoring equipment be protected from lightning? It is necessary for lightning protection manufacturers and engineers to strengthen the awareness of lightning protection and grasp the correct lightning protection methods.
As for the lightning protection measures, there are two typical wrong ways in the industry at present. One is to install lightning rod on the security monitoring bracket. Some people think that installing lightning rods on the monitoring brackets is the safest way to send lightning underground, which may be wrong! Isolated poling outdoor camera to prevent direct lightning shall set up independent lightning rod, poling and independent lightning rod distance should be greater than 4.5 meters, the use of wood or cement poling is more advantageous to the insulation insulation materials, camera is best engineering plastic holder, in order to improve the insulation level. Instead of installing the lightning rod directly on the safety monitoring bracket, it is actually "lighting" rather than "lightning protection".
Second, the improper grounding provides a path for the ground potential intrusion security system, causing the system damage. Multi-point grounding is suitable for strong power. In monitoring weak power system, single point grounding can protect the product more. The "grid ground potential" is introduced into the security system through the ground loop through the artificial multi-point grounding of the security system, resulting in voltage surge. Low voltage resistance of weak current system is low, the pressure difference is too large at this time, once the system cannot bear the damage caused or will be devastating.
The awareness of mine prevention in the industry has been gradually improved
The above seems simple lightning protection error, why will happen frequently, this and the industry on the lack of awareness of lightning protection is inseparable. In past years, the party a as the main body of the project construction of lightning protection for security equipment insufficient understanding, they think that after the completion of the whole system construction, there is no problem to use can, don't realize the importance of lightning protection design for the whole system. And some security lightning protection products manufacturer or not professional lightning protection engineering business, or for reasons of cost, ignore the design of lightning protection, indirectly increase the risk of security equipment from lightning attacks.
With the development of the security industry, especially the construction of pingan city and smart city, more and more outdoor security equipment has been installed, and people's awareness of lightning protection of the monitoring system has been gradually improved. Especially with BT, BOT mode construction of safe city project, project traders to the construction of the system is especially pay attention to, because the warranty products once the malfunction of the lightning engineering contractor should assume corresponding responsibility. In addition, with the occurrence of lightning strikes in recent years, people's awareness of lightning protection has gradually increased. All these raise the awareness of party a, the manufacturer of safety and lightning protection products and the engineer on the lightning protection design. 5 L: m3 {0 p
Common problems in installing lightning protection equipment in monitoring system
Shenzhen zhenfu security co., LTD. Believes that professional lightning protection products manufacturers or engineers will encounter the following problems when installing lightning protection equipment on the monitoring system:
The ground resistance is too large or ungrounded. Video safety monitoring system engineering design specifications and building information system lightning protection technical specifications do not clearly specify the ground resistance value of monitoring system lightning protection. Generally, the ground resistance of the design monitoring system is based on the resistance value of the computer room and the ground resistance value of the information system. In particular, the ground resistance of the monitoring system can be appropriately increased according to different geological conditions. For example, forest fire prevention units, video cameras required to install on the ridge, the address is bluestone, within 200 metres of river channels, no for mining large gravel, soil zone. This time for this particular parts of the monitoring and control system for ground if requirements do not greater than 4 ohms, cost is ten times the monitoring system itself, and even dozens of times then choose proper grounding resistance, use the chase flow cable for connecting the ground wire.
No direct lightning protection measures. This situation is more common is the bolt camera, some people think that has installed the triad signal arrester, grounding is done, there should be no problem, but does not know of resisting the inductive thunderbolt at lightning arrester is a tool, no much effect for lightning. Direct lightning protection mainly relies on devices such as lightning rods, which change the direction of lightning operation and make it impossible for lightning to directly hit the monitoring equipment. There is also a situation is to use a curved lever of the ball machine installation of lightning rod and the metal rod if the ground itself has been good to guard the ball machine, there is no need for an increase in costs, install the lightning rod.
The signal arrester is too far away from the device to be protected. If the arrester is installed too far away from the device, there is no way to eliminate the lightning flow induced by the arrester to the communication line and the power line at the front of the device. Therefore, it is suggested that the signal arrester should be installed directly to the front end of the monitoring equipment, especially where the signal power line should be obvious.
In order to save the cost, metal rods are often used as the lead wires of the working grounding system, regardless of "yes" or "no". According to the design of general metal rod as the lightning protection system down lead, this time the work to the metal bar, if there are time in signal of direct lightning arrester front and a metal rod rod body moment without voltage difference, lightning will directly impact signal surge arrester or power surge protectors, such meetings make arrester aging or damage on the spot in advance. Therefore, it is recommended that the work site lead off the line should be independently connected.
The market capacity of security and lightning protection products is gradually expanding
With the improvement of people's awareness of safety and lightning protection, the capacity of the lightning protection market is also gradually expanding. According to the China quality association lightning-proof branch of China's major surge protector domestic application market investigation and analysis, the surge protection industry is still in its infancy, there are larger market space, only preliminary estimates, the market capacity of more than 14 billion yuan a year, China quality association lightning-proof branch of surge protection products products in market size estimates for 1.5 billion. Where do these 1.5 billion markets come from? This paper, according to 2008 surveillance cameras in our country there are more than 600 enterprises, the annual output of 15 million units, if 10% of surveillance cameras need to configure the surge protector, surge protector of the market capacity is 1.5 billion yuan. Especially, in recent years, the construction of pingan city and road monitoring has gradually increased the application of outdoor cameras, which will further improve the market capacity of surge protector.
Released recently, the state administration of cultural heritage of the museum and the cultural relics protection unit security system requirements "and" cultural relic building lightning protection technology standard "two standards, mainly for the security and the lightning protection industry together of two different specification construction, enhance the level of safety and continuously toward standardization development, to the requirement of lightning protection standards and product market development plays a great role in promoting.
People pay more and more attention to safety, so that the awareness of security and lightning protection has been improved in recent years. For party a and the engineer, the awareness of lightning protection needs to be improved. At present, there are relevant national and industrial compulsory standards for the design, construction and acceptance of lightning protection. It is suggested that party a find a professional company to be the lightning protection part of the security system. After the system is put into use, the corresponding equipment should be well maintained and management system should be established. Arrange full-time personnel familiar with lightning protection technology to take charge of system maintenance, carry out comprehensive inspection before the arrival of thunderstorm season and carry out routine maintenance after each lightning weather. When lightning strikes occur, timely investigation and analysis of the causes and losses of lightning damage, and improvement of protection measures. Only in this way can security equipment play a better role.
Conclusion: lightning protection to everyone should be ready to do, first of all, the CCD machine manufacturers have added lightning protection circuit on the circuit board, solve the induction lightning damage, and monitor the construction units to do a good job in lightning protection grounding installation of lightning rod, lightning arrester, such as equipment, so as to decrease the loss of a lightning strike to bring.