2020-07-22 12:57:54 1070
Thunder and lightning are natural disasters. We cannot predict where the disaster will break and the extent of damage. All we have to do is prevention work. How to better prevent lightning from attacking our machines from damage? The following Gold Mine will tell you about mechanical protection against lightning. Measures.
With the development of science and technology, even though it is impossible for humans to completely control the violent lightning, after long-term exploration and practice, a lot of knowledge and experience about lightning protection have been accumulated, forming a series of Effective methods and technologies for lightning protection. These technologies include grounding, flashing, shunting, etc., and I will explain them in detail below.
1 Grounding is the lightning energy that has been incorporated into the lightning protection system. Leakage into the earth, good grounding can effectively reduce the voltage on the down conductor and avoid counterattack. In the past, some regulations required electronic equipment to be grounded separately, in order to prevent stray current or transient current in the power grid from interfering with the normal operation of the equipment. Grounding is a basic link in the lightning protection system. If the grounding is not good, the lightning protection effect of the lightning protection measures cannot be exerted. The lightning protection grounding is the basic safety requirement in the lightning protection facility installation acceptance specification.
2 Flashing is to let the lightning energy appearing in a certain range be discharged into the earth according to the channel designed by people. The lightning discharge of a certain protection range is captured and included in the pre-designed reasonable way to discharge to the ground. It is an active air-termination device whose function is to guide the lightning current into the earth. Lightning wire and lightning strip are developed on the basis of lightning rods. The use of lightning rods is the basic lightning protection measure.
3 shunting is to connect an appropriate lightning arrester in parallel between all wires from the outdoors and the grounding wire. When the overvoltage wave generated by direct lightning or induced lightning on the line enters the room or equipment along these wires, the resistance of the arrester suddenly drops To a low value, close to a short-circuit state, the lightning current is shunted into the ground. Shunt is the key to the rapid development of modern lightning protection technology, and it is a key measure to protect various electrical and electronic equipment. Since the lightning current is shunted, there will still be less Part of the device enters the device along the wire, which is still very dangerous for microelectronic devices that are not resistant to high voltage. Therefore, for such devices, multi-level shunting should be carried out before the wire enters the casing. When the shunt is used as a lightning protection measure, it should be Pay special attention to the selection of the performance parameters of the lightning arrester, because the installation of additional facilities will more or less affect the performance of the system.
For the lightning protection of mining machinery, we need to install lightning rod devices in the mining area, and install lightning rods in the mining area. The height of the lightning rod is higher than the high point of the mining machinery to achieve an effective protection radius to prevent lightning from directly hitting any operating machinery. The grounding of the lightning rod must be reliable, because the geological soil in the limestone mountainous area is relatively dry and hard, and the soil resistance value is too large. Therefore, the grounding network is not the same. The height of the lightning rod is higher than the high point of the mining machinery to achieve an effective protection radius to prevent lightning from directly hitting any operating machinery. The grounding of the lightning rod must be reliable, because the geological soil in the limestone mountain area is relatively dry Hard, the soil resistance value is too large, so the grounding grid is not the same.
There is another situation that requires us to install an overvoltage protector on the electrical control device of the mining machinery mill. The electrical control device of the mobile machinery in the open air environment is vulnerable to the intrusion of the induced lightning surge voltage. In order to protect the mechanical microelectronic control devices with extremely high control sensitivity from the intrusion of induced lightning surge voltage, an overvoltage protector is installed according to the different structural characteristics of each mechanical control device.
We must be responsible for each machine, so the personnel responsible for lightning protection and other safety work must take precautions to avoid unnecessary losses.