How does a power surge protector work? Please explain in detail! 5

How power surge protectors work.

1.SPD function.

Excessive voltage and current in the bleeder circuit to protect the safety of electrical equipment.

2.Requirements for power surge protectors.

The state has regulations (GB50343 and GB50057), and the power lightning protection is divided into three levels according to the division of lightning protection. To put it simply, level 1 lightning protection is very energetic, level 2 is second, and level 3 is the second.

3.According to the lightning protection requirements of different locations.

The power surge protector completes the action of discharging to the ground (treating the earth as an electrical device) when the high-energy voltage and current pass through the components of different energy discharge.

4.The main function of the power surge protector is that the normal voltage and current pass through normally. If the voltage and current reach the energy of the lightning protector, it will be vented to the ground.

What is the principle of the varistor, in fact, it is just a case of a high-power varistor.

The basic principle of operation is that the inner gap (also known as the arc extinguishing gap) is placed inside the arc extinguishing tube made of gas-producing material, and the outer gap separates the pipe from the power grid. The lightning overvoltage discharges the inner and outer gaps, and the high temperature of the internal gap arc causes the gas-producing materials to produce gas, and the air pressure in the pipe increases rapidly, and the high-pressure gas is ejected from the nozzle to extinguish the arc.

The arrester has a large impact current capacity and can be used in places with a large lightning current amplitude. However, the discharge voltage of the arrester is high and the dispersion is large, and the interception is generated during operation, and the protection performance is poor. It is mainly used for the protection of incoming lines in substations and power plants and the protection of line insulation weaknesses.

Three-phase power surge protector is a lightning protection maintenance power supply suitable for a variety of power system software. , Three-phase power surge protector: three-phase power lightning protection box, three-phase power lightning protection control module, 380V power lightning protector, three-phase power supply high-voltage arrester.

Fields of application. Three-phase power surge protector with a tolerable through-current volume of 20 kA and 40 kA three-phase power surge protector is suitable for all kinds of power system software (such as UPS power supply. lightning protection maintenance of the power supply of the main engine room, etc.; The lightning protection box with a tolerance flow volume of 10ka is suitable for lightning protection maintenance of a variety of machinery and equipment power supplies. This device is commonly used to move communication towers.

Microwave communication station. Communication room. Industrial production plants and mining enterprises.

Civil aviation. Finance. securities and other power system software, such as various substations.

High and low voltage distribution room. Distribution box. AC and DC power distribution panels.

Distribution boxes and a wide variety of other critical and lightning-susceptible machines.

Telescopic characteristics, situation indicator light, marking the operation status of the lightning protection box. The flow volume is large, and the residual discharge is low. Wide application coverage and ns-level response time.

Complete the differential mode. Multi-mode maintenance. The unique impact fused disc is selected, which has high stability.

The key components are selected from world-famous brands, with performance and long service life. The interior is equipped with temperature control. Overcurrent protection power supply circuit, completely avoid fire accidents.

Environmental protection and energy saving. Environmental protection, easy installation and operation. Convenient and maintenance-free.

Application attention. Be sure to disconnect the power supply before installation, and prohibit the actual operation of induction power. The lightning box can be mounted on a wall or horizontally. When installing, please follow the connection shown in the installation plan, in which it is the neutral line of the live wire, N is the neutral line, PE is the grounding wire, and do not misconnect.

After the installation, check whether everything is working in order.

During the application period of the lightning protection box, the operation status of the indicator should be checked and inquired regularly: the indicator light is emerald green, and everything is normal in the work of the lightning protection box; The indicator light is bright red, and the lightning protection box has a common fault, which should be repaired or replaced immediately. The electrode connection wire should be a multi-core copper core wire of not less than 6mm, and the specification is short.

Coarse. Straight. Lay staff should not disassemble and assemble.

Software that can be used to adjust the power supply system and prevent circuit problems afterwards. It is necessary to understand the field of application, then the instructions for use, and finally the connection with other machines.

The meaning of this word is the lightning arrester of the power supply, which can prevent the impact between lightning and other parts of the equipment causing damage, be sure to find the zero wire, busbar, you should pay attention to the wiring port, and choose some materials with better effects.

The power surge protector is to avoid damage caused by lightning, and I don't know how to connect it, so I need to find a professional electrician to install it.

Here's how it works:

For the voltage limiting type, it is mainly composed of varistors and TVS transient suppression diodes, and the action characteristics of this lightning protection product are that the increase in the intensity of the lightning current at will make its ability to discharge the lightning current to the ground also become larger, and the response speed is also quite fast, and it can effectively reduce the residual voltage on the power grid, and channel the simulated lightning impulse current of 8 20us.

The components of the switching type lightning protection are different from the voltage limiting type, which are mainly composed of some components such as gap discharge, gas discharge tube, thyristor and so on. Once the lightning current intensity exceeds the rated standard of the operation of the switched lightning protector, the lightning protector will instantaneously discharge the lightning current to the greatest extent. The switched lightning protection device has the advantage of strong discharge ability, and can channel 10 350us of simulated lightning impulse current.

Its function is to release the overvoltage leakage caused by lightning strikes or induction in the circuit in a very short time, so as to protect the equipment in the circuit from being affected. And the power supply lightning protector and the monitoring signal lightning protector may be different in the installation mode, mainly in parallel and need to be connected with the grounding system, under normal circumstances, it is in a state of short circuit, if the overvoltage in the circuit exceeds the action standard, it will be quickly channeled to the ground, so as to discharge the discharge lightning current or overvoltage, when the discharge is completed, it will return to the previous short circuit state.

There is only one working principle of the power surge protector, which is to quickly bypass the voltage clamp. However, there are many ways to implement it, mainly considering the advantages and disadvantages of different components to complement each other. For example:

The device of the general source surge protector is composed of zinc oxide varistor, and the characteristic of zinc oxide is that it may cause a short circuit during breakdown (because there are only 2 breakdown consequences, open circuit and short circuit), so the 3-phase arrester will add an air gap arrester, which is often called 3+1;The other is direct bypass grounding, the most common of which are these two.

The working principle of the surge arrester is as follows:

The lightning protector is a low-voltage and high-resistance open-circuit state and a high-voltage low-resistance short-circuit state. It can withstand high currents of hundreds of amperes through a combination of overvoltage protection electronics connected in parallel on the power line and signal transmission line. When lightning strikes and high voltages and high currents are encountered, a short circuit occurs immediately.

At the same time, the main power switch is disconnected to protect the computer equipment. When it is installed and used in series, its physical surface shape and signal arrester require low high-frequency signal loss.

The internal clearance of the surge protector is placed inside an arc extinguisher made of gas-producing material, and the outer gap separates the arc extinguisher from the power grid.

The lightning overvoltage causes the discharge of the inner and outer gaps, and the high temperature of the internal gap arc causes the gas-producing substances to produce gas, and the air pressure in the pipeline rises rapidly, and the high-pressure gas is sprayed out from the nozzle to extinguish the arc. The tubular arrester has a large inrush current capacity and can be used in places with a large lightning current amplitude. However, due to the high and dispersed discharge voltage of MOA, its interception and protection performance are poor.

It is mainly used for incoming line protection and line insulation weak protection of substations and power plants.

The working principle is to use an overvoltage protection electronic device that can withstand hundreds of amperes of high current and be used in parallel on the power supply line and signal transmission line with a high-resistance open-circuit state at low voltage and a low-resistance short-circuit state at high voltage. When encountering lightning strikes and high voltage and high current, it immediately presents a short circuit, and at the same time disconnects the main power switch, so that the computer equipment is protected. A tandem installation is used only when it is in the form of a physical surface.

Signal lightning protection devices are required to have low loss of high-frequency signals.

The lightning protection device is actually a surge protective device SPD, which is installed in parallel or series at the end of the protected equipment to protect the equipment by venting the surge current and limiting the surge voltage. The discharge of the surge current and the limitation of the surge voltage are all done by its nonlinear components (varistor, TVS or discharge tube, discharge gap).

Well-known brands: Airshield power surge protector, Crero power surge protector, OBO power surge protector, DEHN power surge protector 020-22831077

Shengpude lightning protection technology **** is mainly engaged in lightning rods, lightning arresters, SPD Wangtong lightning protection, three-in-one lightning protection and other grounding products, and connected to various lightning protection projects. I don't know how you feel. I heard from friends that the service is very good, the product is very good, and the service is also very good.

It is the lightning rod that will become the lightning rod, and the lightning arrester will only work when there is a lightning current, but will not lead the lightning bolt.

Do not install the lightning protector on your device.

If the backup is directly grounded, then the high current when the lightning strikes passes through your equipment and then enters the earth, and your equipment may be broken when the high current passes.

For example, if two gangs are facing each other, it may become a group fight (being struck by lightning), or they may not be able to fight (not being struck by lightning), and as a result, a person (lightning protection) is afraid that his group (equipment) will be beaten, so he will lead hatred (lightning strike) to himself.

Difference Between Lightning Arrester and Lightning Rod:

1. Lightning rod - direct grounding.

The phenomenon of discharging at the tip of the charge is used to prevent lightning strikes from occurring. The lightning rod and the protected object are separated, which can protect the more concentrated important objects.

2. Arrester - indirect grounding.

The phenomenon of overvoltage discharge is used to allow the lightning strike voltage to enter the ground through the arrester. The arrester and the protected object are connected and can protect the live object, such as the transmission line.

How the arrester works:

A surge arrester is actually a non-linear excellent resistor, with very little resistance at high voltages and high resistance at low voltages, acting like a regulator diode. At present, the arrester is generally a zinc oxide arrester, and the main component is the zinc oxide valve. The arrester is connected in parallel with the protected equipment in the power system, and the leakage current is very small under normal conditions, which does not affect the operation of the system.

When the system is overvoltage (i.e., high voltage that exceeds the normal operating voltage), the arrester presents low resistance discharge energy, while limiting the amplitude of the system voltage to ensure that the insulation of electrical equipment is not broken down.

Surge arresters please see:

Lightning rods please see: