The insiders know that lightning is very destructive, mainly including direct lightning, lightning induction, lightning wave intrusion and ground voltage counterattack. Among them, the inductive lightning and voltage counterattack have the strongest damage to weak electrical equipment. Next, this article introduces the protection measures for the lightning protection of the vehicle and the lightning protection. The interested friends can look at this small series together!
First, several protection methods for lightning
1. Protection against direct lightning strikes
A lightning rod can be used for the direct lightning strike. The lightning rod is composed of three parts: the uppermost part is called the power receiving end, the middle part is the conductive line, and the lower part is the grounding body. When the thunderstorm cloud is close to the lightning rod, it induces a large amount of heterosexual charge. The discharge of the conductive line and the receiving end into the air and the charge in the thunderstorm cloud neutralize the electric field strength of the thunderstorm cloud to achieve lightning protection. If the power receiving end is a direct lightning strike, the lightning rod can introduce lightning current into the earth, thereby playing a protective role.
2. Protection against inductive lightning
In order to protect the inductive lightning from damage to the power supply line, transmission cable and overhead antenna and high-rise conductive building, a silicon carbide valve type arrester or metal oxide arrester can be installed on the line. For high-rise buildings, the metal facilities in the building can be grounded together; for non-metallic roofs, metal protective nets can be added and grounded reliably. Although these measures are effective, they are sometimes inevitably subjected to lightning strikes. The main reason for this is that there is a grounding resistance. The lightning strike grounding body flows through the grounding resistor to generate a very high voltage, and the device can still be damaged, so the lightning protection effect is not satisfactory. Now with the progress of society, especially the rapid development of electronic technology, lightning protection technology is constantly improving and improving. Manufacturers of lightning arresters are increasing, and new types of arresters for various types of applications are constantly being introduced. Equipotential arresters are one of them.
Second, although there are many lightning protection technologies in China, the principle is nothing more than three methods of lightning protection: car lightning protection and inductive lightning protection measures
First, the split-type arrester adopts the disconnection method to quickly disconnect the power supply during lightning strikes to protect the equipment.
Advantages: Simple engineering.
Disadvantages: lightning strike time is extremely short (in nanoseconds), sometimes it is too late to completely disconnect, lightning pulse current has caused heavy damage to electrical equipment, while people's lives and work today do not allow electrical equipment to be powered off at will; Obviously, it is not able to better protect against lightning, and the effect can be imagined. Therefore, it will be gradually selected for use.
Second, the grounded arrester is a ground drain method;
Principle: Directly introduce lightning current into the earth to avoid lightning strikes on electrical appliances, but it needs a perfect buried line project.
Advantages: The lightning can be completely discharged.
Disadvantages: It will bring great construction inconvenience to the installation of high-rise buildings, or the installation of unsatisfactory places such as mountains and loess. The lightning discharge effect in this environment is not ideal, and it will be corroded for a long time. No one will go to check whether the ground wire is corroded or sometimes the environment is not allowed. To achieve the national standard (resistance value ≤ 4 ohms), the fully qualified cost is almost several times or even several times the cost of the lightning arrester itself. If the ground wire is not well done, it will not be able to achieve lightning protection. Lightning will directly damage the equipment. If there is a kind of drawback that can solve the above problems at the same time, it is very ideal.
Third, the equipotential surge arrester Leisheng HL-20K lightning protection series is our company's special work clothes with good electrical conductivity according to the high-voltage transmission and transformation maintenance workers. It can be charged at tens of thousands of volts arrester high voltage without being shocked. A new type of equipotential arrester developed and produced by the principle of equipotentiality.
1. Main advantages of equipotential arresters:
a. The lightning protection effect is independent of the grounding. Because the lightning arrester adopts the “equal potential†processing technology, its lightning protection effect has nothing to do with whether the equipment is grounded or not, thus eliminating the trouble of installing a conventional lightning arrester that must be grounded. Therefore, the installation is simple and convenient to use.
b. Extend the service life of high electrical equipment
Although the electrical equipment is not damaged by lightning strikes, the lightning pulse will impact the electrical equipment for a long time, causing the electrical performance of each component to be damaged, affecting the service life of televisions, computers and other equipment. After installing the equipotential lightning arrester, we are fully committed to the protection of electrical equipment.
c, although the body shape is small, but the protection equipment is very big
The electrical appliances are damaged by the heat generated by the equipment or components under the action of a large lightning current. The energy of heating is proportional to the resistance, current, and time of action. Although the current is very large during lightning strikes, the internal resistance of the lightning protection is very small (8~20 microseconds), and the heat is also very small, so it can protect the equipment and it will not be damaged by itself. Moreover, because the arrester is current type, it can withstand a very high lightning strike voltage, as long as it does not exceed the maximum current that the arrester is subjected to, even if the lightning strike voltage is tens of thousands of volts or higher.
d, power supply. The signal channel is also protected from lightning at the same time, and it is maintenance-free, both flame retardant and explosion-proof.
e, with automatic diagnosis and modification and repair of internal faults. Vehicle lightning rod protection and protective measures for lightning
f. Safety warning function: When the lightning protection device is completely damaged, no current is output, and the warning cannot be used continuously. This warning function is not available in other lightning protection devices.
Product description:
With our vast experience & knowledge in this field, we are engaged in manufacturing a quality-assured ranges of Heat Sink.
The material used partly determines the extent of thermal conductivity. Copper and aluminum are the most widely used materials, though aluminum is the more common choice because copper is more expensive and heavier. Aluminum 6061 and 6063 are widely used with a thermal resistance of 166 and 201 W / mK, respectively.
Fan Heatsink,Cooling Fan With Heatsink,Heatsink Fan,Computer Cooling Fan
Timeplex Industrial Limited , https://www.timeplexhk.com