Do you need a lightning arrester for the two storey villa?
Lightning arrester installation specification: commonly used (here only refers to the single needle) protection calculation method of main line method and the range of ball method, therefore, the "line" and "ball calculation method" are analyzed and discussed, preliminary concluded: "the main characteristic line method" is the visual design and calculation simple, save investment, but the building height is greater than for more than 20 m; the "rolling ball method" can calculate the lightning rod (band) and the scope of protection of grid when combined, but the calculation is relatively complex, the investment cost is relatively high. In the method of calculating the protection range of lightning rod, the fold line method is a comparatively mature method. In recent years, the "ball rolling method" stipulated in the national standard has also begun to be recognized by peers, but in practice, the "ball rolling" method also encountered some problems, especially in the calculation of lightning protection area of day surface. Therefore, it is necessary to compare and analyze the "fold line method" used in power system and the "rolling ball method" of national standard, and find out the existing problems.
Proposal or installation on the good.The lightning rod aims at setting up a lightning protection zone for the protected object to reduce the possibility of direct lightning stroke of the protected object. If the protected object is in the protection zone of direct lightning, the object in the area can not be directly struck by lightning. When lightning and lightning rod discharge, most of the lightning current through the lightning rod grounding device into the ground. Thus, the protective material is not damaged by current.
Many people believe that the roof has been set lightning rod, we can guarantee that all of our home appliances Safety lightning protection. In fact, this view is wrong. In fact, the lightning rod can only prevent direct lightning, and can only protect the building. It will also discharge a lot of induced lightning when watching direct lightning. The lightning arrester will cause damage to the electric apparatus by invading the electric appliance at the moment along the antenna, feeder, signal line and power line. Therefore, lightning protection alone alone is not enough, we must add three lightning protection system. Three class lightning protection system refers to the building lightning protection system, floor power supply, lightning protection box and indoor lightning protection socket.
There are also some people who are accustomed to turning off the TV, computer and so on when the thunder begins. In fact, this method can not protect the security. Due to the sensitivity of computer and VLSI is unusually high, the lightning arresters installed even in computer facilities building, electromagnetic induction and electrostatic induction lightning strikes, still can form high voltage shock wave, the electronic equipment damaged. A thunderstorm came, it is best not to use the computer, the power is not just turn off the electrical lightning, because the ground is connected to the current strong lightning produced by electrical wires and eventually to the earth, so just turn off the electric power supply, will be through the current into the ground, so just shut the power does not guarantee complete security only, unplug the appliance plug, completely withdraw from the circuit, in order to ensure safety. In addition, in the work or many can not turn off the power supply, to ensure the safety of electricity, or need to choose a large power supply lightning protection socket.
