Lightning protection hot topic Shenzhen thunderstorms 9119 lightning strikes on security equipment

   2014.3 end Shenzhen recorded rainfall intensity is the strongest in 60 years in an hour. Expected short-term convective weather still more active. 30 at noon to 31 period, large area of Guangdong suffered heavy rain. Shenzhen No. 31, like the evening in the morning, after a brief pause, heavy rain again. During the 30 thunderstorms within 5 hours of recorded 9119 lightning strikes. Has reported the death tolls of 2 people. Meteorological department said, local area of the heavy rainfall was recorded within an hour of 114 millimeters of rainfall, rainfall intensity is the strongest hours in 60 years.
During thunderstorms within 5 hours was recorded 9119 times lightning is what concept? We have to thunderstorm weather so rampant attention, from the security point of view, lightning protection setting security monitoring of transmission equipment is the process and can not be neglected in the design, monitoring device for outdoor equipment, especially the head are installed on the upper floors of the building equipment especially need to increase the protection to avoid electricity function!
Pooled security equipment lightning protection technology
Security system including front information acquisition equipment, transmission lines and the back-end storage and monitoring center, the lightning surge protection of each part should be treated differently.
1, the front-end equipment protection
Front end equipment is divided into indoor, outdoor two, outdoor equipment if the move away from buildings, not in the effective protection of direct lightning protection building within the apparatus, they have to install lightning protection device for consideration; already in the lightning arrester (lightning rod or other lightning conductor) or high-rise buildings within the original lightning front-end equipment system protection range, generally no longer be considered lightning protection. Such as outdoor camera, in the building lightning arrester protection range, in order to prevent lightning induction, along the camera power line poles drawing and signal line in addition to wear in the steel grounding to achieve shielding effect, to prevent the lightning current along the line the invasion front end equipment, in front of each line equipment should the lightning arrester corresponding, and the lightning arrester to the ground, and ensure the quality of the arrester grounding, otherwise is not installed.
Notable is, outdoor isolated pole camera direct lightning protection should be set up independent lightning rod, but the pole cameras should be effective protection range of lightning rod is placed in the independent, and independent lightning rod and the pole distance from the camera (as far as possible to ensure the effective protection of the premise) should avoid the effects of induced magnetic field of lightning rod lead a strong discharge of lightning current on camera cable, another camera pole and a mounting bracket is the best steel (both steel, wind and electric conductivity and good shielding), and also to do very good grounding (earthing resistance to achieve the requirements of indoor lightning protection); the front-end equipment needed to do a lightning surge protection, video monitoring system by the conventional three in one (Video + control + power supply), two in one (Video + power supply) lightning protection products, to protect the front-end equipment such as power supply, video camera, PTZ control.
2, transmission protection
Including the transmission signal line and the power line protection. Transmission line monitoring transmission equipment shall be recommended by the directly buried installation, do not recommend the use of overhead, because the overhead line the most vulnerable to lightning. Such as non overhead can not be, to avoid the head end equipment damage, overhead cable is to be strengthened, such as using the shielding cable of high quality, increase the shielding copper mesh density, shielding copper net do ground handling; and try to make the overhead line along the building go, but to stay away from the flat lightning conductor transmission, should do ground handling at each pole, metal pipe line and aerial cable way of overhead cable shall be grounded, the signal source and the center of power amplifier input shall be arrester respectively access right.
3, the back-end storage and monitoring center equipment protection
The lightning protection, monitoring center buildings have anti lightning arrester, lightning protection belt or the lightning protection net. From the induction lightning protection, all kinds of metal pipe into the control center shall be connected to ground against induction thunder device. Cable overhead introduced directly, should be the installation of surge arresters in home office, and the cable metal protection layer and self supporting cable connected to a grounding device. The monitoring center should be set equal potential connection box, and copper extraction, the best around the monitoring center wall walk (in antistatic floor), and lightning protection grounding terminal, PE line, equipment protection, anti-static, metal tube groove are connected to other potential on the bar, with the potential to prevent check the risk difference. Various surge protective device (MOA) and other earth wires shall be made of copper wire, and the shortest and possible coarse wire diameter and equipotential copper electrical connections.
Reminder: heavy rain season, the public should pay close attention to early warning information, master the basic defense measures is particularly important. Such as the issuance of rainstorm orange, red warning signal, outdoor workers should pay close attention to the rainstorm and the traffic information, high voltage electrical equipment from the overhead lines, tower and transformer, avoid crossing water area, contact of bare wire, lead to electric shock; cancel the rainstorm warning signal that does not mean it is safe, easy to secondary disaster areas around the river and dangerous slope, people still need to strengthen the safety precautions.