The protective measures for the lightning protection of the vehicle and the protection of the induced lightning are to limit the lightning impulses generated by various types of metal pipes and wires that enter the building when lightning strikes, cloud flashes, and cloud lightning strikes, thereby protecting the building. Internal personnel and various electrical equipment safety. The measures taken should be based on the specific conditions of various equipment, in addition to having a good grounding and wiring system, and safety distance, but also according to the power supply line, power line, signal line, communication line, feeder installation of the appropriate arrester and shielding Measures.
In the lightning protection system, inductive lightning protection needs to be set. In the power plant, what are the main hazards of inductive lightning and whether it can be connected to the grounding system of the power plant:
People in the industry all know that lightning is very destructive, and there are mainly four forms of direct lightning, lightning induction, lightning wave intrusion, and ground voltage counterattack. Among them, inductive lightning and voltage counterattacks have the strongest damage to weak electrical equipment. When thunderstorms in the sky cause lightning strikes, they will carry high-load lightning impulses, voltages and currents and be released in the form of electromagnetic waves in an irregular manner, resulting in a range of 1 to 5 km (depending on the strength of the lightning wave) in all minefields. (such as overhead antenna, cable TV cable, communication cable, power supply system cable, etc.), pulse voltage and current of corresponding intensity are sensed in an instant. These currents enter electrical equipment along various power or signal cables on electrical equipment. Internally, the internal components are destroyed when the lightning voltage exceeds the rated voltage of the electrical equipment. The main reason is that the voltages on all the electric wires and cables connected to the electric equipment are not equal, and the high voltage is washed away to form a current. Partial damage to electrical equipment caused the entire equipment system to collapse. In serious cases, it even destroyed the entire machine and even reached personal safety.
First, several lightning protection methods 1, the direct lightning protection for direct lightning can use lightning rods, lightning rod consists of three parts: the top part is called the power end, the middle is the conductive line, the lower part of the grounding body. When the thunder cloud approached the lightning rod, it induced a large amount of opposite charges, and the intensity of the electric field of the thunder cloud was weakened through the discharge of the conductive wire and the receiving end to the charge of the air discharge and the thunder cloud, achieving the purpose of lightning protection. If the power end is a direct lightning strike, lightning rods can introduce lightning currents into the earth to protect them.
2. Protection against Inductive Lightning In order to protect the induced lightning against damage to power supply lines, transmission cables and overhead aerials and high-rise conductive lines, silicon carbide valve arresters or metal oxide surge arresters can be installed on the line. For high-rise buildings, the metal facilities inside the building can be jointly grounded; for non-metal roofs, metal protective nets can be added and reliably grounded. Although these measures are effective, they are sometimes unavoidable due to lightning strikes. The key reason is that there is a grounding resistance. Lightning strikes the grounding body through the grounding resistance and generates a very high voltage, which can still damage the equipment. Therefore, the lightning protection effect is not ideal. Now with the progress of society, especially the rapid development of electronic technology, lightning protection technology is constantly improving and improving. The production of arrester manufacturers has increased, and new types of arresters of various types have continued to emerge. Equipotential surge arresters are one of them.
Second, although there are many kinds of lightning protection technology in China, the principle is nothing more than three methods of lightning protection: protection measures for vehicle lightning rod protection and induction lightning. First, the disconnected lightning arrester adopts a disconnection method to quickly disconnect the power supply during a lightning strike. , protect the equipment. Advantages: simple engineering. Disadvantages: Lightning strike time is very short (calculated in nanoseconds). Sometimes it is too late to completely disconnect. The lightning pulse current has caused heavy damage to electrical equipment. At the same time, people's lives and work do not allow electrical equipment to be powered off at will. Obviously, it is not able to be better protected against lightning. The effect can be imagined. Therefore will be gradually put to use.
Second, the grounding arrester is the use of ground discharge method;
Principle: The lightning current is directly introduced into the earth to prevent lightning strikes on electrical appliances. However, there is a need for a well-grounded underground project.
Advantages: You can completely discharge the lightning.
Disadvantages: It will cause great construction inconvenience to the installation of high-rise buildings, households with unsatisfactory discharges such as mountains and loess. The lightning effect in this environment is not ideal, and it will be corroded for a long time. No one will always check whether the ground wire has been corroded. Sometimes the environment is not allowed. To achieve the national standard (resistance ≤ 4 ohms), the fully qualified cost is almost several times, or even several times, the cost of the arrester itself. If the ground wire is not done well, it will not be able to provide lightning protection. Lightning will directly damage the equipment. If there is a drawback that can solve the above problems at the same time, it is ideal.
Third, the equipotential arrester Lei Sheng HL-20K lightning protection series is our company according to the high-voltage power transmission repair workers wear special work clothes with good conductivity, can be live on tens of thousands of volts arrester high voltage without the electric shock, this A new type of equipotential arrester developed and produced by the equipotential principle.
1. The main advantages of the equipotential arrester:
a. The lightning protection effect has nothing to do with the grounding. Because of the use of the "equipotential" processing technology, the lightning arrester has nothing to do with the grounding effect of the equipment, so as to avoid the trouble of installing the traditional arrester. Therefore, the installation is simple and easy to use.
b. Prolonging the service life of high electrical equipment. Although the electrical equipment has not been damaged by lightning strikes, lightning impulses will impact the electrical appliances for a long time, resulting in certain damage to the electrical performance of the various components and affecting the service life of televisions and computers. After the installation of equipotential arresters, the protection of electrical equipment is done with integrity and security.
c. Although the body shape is small, but the protection equipment is very big electrical equipment is due to a huge lightning current under the effect of equipment or components and heat damage. The energy of heat is proportional to the time of resistance, current, and action. Although the lightning current is great, the lightning resistance has very little time (8~20 microseconds) and little heat, so it can protect the equipment and it will not be damaged by itself. Moreover, since the arrester is of the current type, it can withstand very high lightning voltages, as long as it does not exceed the maximum current that the arrester can withstand, even if the lightning strike voltage is tens of thousands or even higher.
d, power supply. Signal channel at the same time to avoid lightning, kill two birds with one stone, free maintenance, both flame-retardant and explosion-proof.
e, with automatic diagnosis and modification and repair of internal faults. Car lightning rod protection and lightning protection measures f, security warning function: When the lightning protection device is completely damaged, do not output any current, as a warning can not continue to use this warning function is not available in other lightning protection devices.
In the lightning protection system, inductive lightning protection needs to be set. In the power plant, what are the main hazards of inductive lightning and whether it can be connected to the grounding system of the power plant:
People in the industry all know that lightning is very destructive, and there are mainly four forms of direct lightning, lightning induction, lightning wave intrusion, and ground voltage counterattack. Among them, inductive lightning and voltage counterattacks have the strongest damage to weak electrical equipment. When thunderstorms in the sky cause lightning strikes, they will carry high-load lightning impulses, voltages and currents and be released in the form of electromagnetic waves in an irregular manner, resulting in a range of 1 to 5 km (depending on the strength of the lightning wave) in all minefields. (such as overhead antenna, cable TV cable, communication cable, power supply system cable, etc.), pulse voltage and current of corresponding intensity are sensed in an instant. These currents enter electrical equipment along various power or signal cables on electrical equipment. Internally, the internal components are destroyed when the lightning voltage exceeds the rated voltage of the electrical equipment. The main reason is that the voltages on all the electric wires and cables connected to the electric equipment are not equal, and the high voltage is washed away to form a current. Partial damage to electrical equipment caused the entire equipment system to collapse. In serious cases, it even destroyed the entire machine and even reached personal safety.
First, several lightning protection methods 1, the direct lightning protection for direct lightning can use lightning rods, lightning rod consists of three parts: the top part is called the power end, the middle is the conductive line, the lower part of the grounding body. When the thunder cloud approached the lightning rod, it induced a large amount of opposite charges, and the intensity of the electric field of the thunder cloud was weakened through the discharge of the conductive wire and the receiving end to the charge of the air discharge and the thunder cloud, achieving the purpose of lightning protection. If the power end is a direct lightning strike, lightning rods can introduce lightning currents into the earth to protect them.
2. Protection against Inductive Lightning In order to protect the induced lightning against damage to power supply lines, transmission cables and overhead aerials and high-rise conductive lines, silicon carbide valve arresters or metal oxide surge arresters can be installed on the line. For high-rise buildings, the metal facilities inside the building can be jointly grounded; for non-metal roofs, metal protective nets can be added and reliably grounded. Although these measures are effective, they are sometimes unavoidable due to lightning strikes. The key reason is that there is a grounding resistance. Lightning strikes the grounding body through the grounding resistance and generates a very high voltage, which can still damage the equipment. Therefore, the lightning protection effect is not ideal. Now with the progress of society, especially the rapid development of electronic technology, lightning protection technology is constantly improving and improving. The production of arrester manufacturers has increased, and new types of arresters of various types have continued to emerge. Equipotential surge arresters are one of them.
Second, although there are many kinds of lightning protection technology in China, the principle is nothing more than three methods of lightning protection: protection measures for vehicle lightning rod protection and induction lightning. First, the disconnected lightning arrester adopts a disconnection method to quickly disconnect the power supply during a lightning strike. , protect the equipment. Advantages: simple engineering. Disadvantages: Lightning strike time is very short (calculated in nanoseconds). Sometimes it is too late to completely disconnect. The lightning pulse current has caused heavy damage to electrical equipment. At the same time, people's lives and work do not allow electrical equipment to be powered off at will. Obviously, it is not able to be better protected against lightning. The effect can be imagined. Therefore will be gradually put to use.
Second, the grounding arrester is the use of ground discharge method;
Principle: The lightning current is directly introduced into the earth to prevent lightning strikes on electrical appliances. However, there is a need for a well-grounded underground project.
Advantages: You can completely discharge the lightning.
Disadvantages: It will cause great construction inconvenience to the installation of high-rise buildings, households with unsatisfactory discharges such as mountains and loess. The lightning effect in this environment is not ideal, and it will be corroded for a long time. No one will always check whether the ground wire has been corroded. Sometimes the environment is not allowed. To achieve the national standard (resistance ≤ 4 ohms), the fully qualified cost is almost several times, or even several times, the cost of the arrester itself. If the ground wire is not done well, it will not be able to provide lightning protection. Lightning will directly damage the equipment. If there is a drawback that can solve the above problems at the same time, it is ideal.
Third, the equipotential arrester Lei Sheng HL-20K lightning protection series is our company according to the high-voltage power transmission repair workers wear special work clothes with good conductivity, can be live on tens of thousands of volts arrester high voltage without the electric shock, this A new type of equipotential arrester developed and produced by the equipotential principle.
1. The main advantages of the equipotential arrester:
a. The lightning protection effect has nothing to do with the grounding. Because of the use of the "equipotential" processing technology, the lightning arrester has nothing to do with the grounding effect of the equipment, so as to avoid the trouble of installing the traditional arrester. Therefore, the installation is simple and easy to use.
b. Prolonging the service life of high electrical equipment. Although the electrical equipment has not been damaged by lightning strikes, lightning impulses will impact the electrical appliances for a long time, resulting in certain damage to the electrical performance of the various components and affecting the service life of televisions and computers. After the installation of equipotential arresters, the protection of electrical equipment is done with integrity and security.
c. Although the body shape is small, but the protection equipment is very big electrical equipment is due to a huge lightning current under the effect of equipment or components and heat damage. The energy of heat is proportional to the time of resistance, current, and action. Although the lightning current is great, the lightning resistance has very little time (8~20 microseconds) and little heat, so it can protect the equipment and it will not be damaged by itself. Moreover, since the arrester is of the current type, it can withstand very high lightning voltages, as long as it does not exceed the maximum current that the arrester can withstand, even if the lightning strike voltage is tens of thousands or even higher.
d, power supply. Signal channel at the same time to avoid lightning, kill two birds with one stone, free maintenance, both flame-retardant and explosion-proof.
e, with automatic diagnosis and modification and repair of internal faults. Car lightning rod protection and lightning protection measures f, security warning function: When the lightning protection device is completely damaged, do not output any current, as a warning can not continue to use this warning function is not available in other lightning protection devices.
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