As the computer network more and more in-depth people's lives and work, but also indicates the advent of the digital, information age, but also makes the data center room, lightning protection problems become more and more important, so this article to focus on the lightning protection module, lightning protection box analysis, the following look at the lightning protection module, lightning protection box function characteristics and differences.

What is a lightning protection module?

The surge protection module is a kind of surge protection device, which is made into a module and stuck on the supporting base. The base is usually installed on the guide rail, the lightning protection module in the communication power supply is a protection device we need to use, the protection device is called "lightning protection module", when lightning strikes, the lightning protection module will be the instant large current into the ground release, to ensure the safety of electrical equipment.

Function characteristics of lightning protection module:

The role of lightning protection module is used to protect all kinds of electrical equipment in the power system from lightning overvoltage, operating overvoltage, power frequency transient overvoltage impact and damage of an electrical appliance. The main types of surge protection modules are protection gap, valve type surge protection and zinc oxide surge protection.

The protection gap is mainly used to limit atmospheric overvoltage, and is generally used for the Valve type lightning arrester and zinc oxide lightning arrester are used for the protection of substation and power plant, in the 500KV and below system is mainly used to limit atmospheric overvoltage, in the ultra-high voltage system will also be used to limit internal overvoltage or as internal overvoltage backup protection.

What is a surge box?

The most common is the power surge box, armor domain power surge box mainly includes sealed power surge box, open door power surge box, explosion-proof power surge box, distribution power surge box, matrix power surge box, etc.

According to the use environment, it can be divided into outdoor power surge protection box and indoor power surge protection box.According to the connection mode can be divided into: series type and parallel type.

Note: All lightning protection boxes must be reliably grounded!

The function characteristics of the lightning protection box:

The surge box module is composed of voltage switching module and voltage limiting module (or integrated MOV). It is mainly installed in the distribution room, distribution cabinet, AC distribution panel, switch box and other important equipment, which are prone to lightning strike equipment, to protect the equipment from the damage caused by lightning strike overvoltage invading along the power line; It can be widely used in the main power supply protection of communication, power, transportation, finance, railway, civil aviation and other systems.

Power supply operation independent instruction, lightning failure instruction, deterioration alarm and instruction; Lightning automatic counting function, remote interface, remote indicator of main switch status (optional), dual power supply system, both up and down can enter and exit cable structure (distribution lightning protection box has this function), waterproof, fireproof, moisture-proof box.

The difference between lightning protection module and lightning protection box:

The function is the same, the difference is in the installation, such as installed outdoors, ordinary lightning protection module it is not waterproof need to add a box to protect the module, the other is in the field, some lightning protection box added automatic alarm device, lightning can send a signal in time, and such as the installation of power lightning protection module, There is no power distribution cabinet protection or there is no space in the power distribution cabinet to install the lightning protection module, you need to add a box for protection, but not necessarily all the lightning protection boxes are lightning protection modules, and some are in the form of circuit boards.

Advantages of modular arrester:

1. Cheap, a single module about a few hundred yuan;

2. Compact, comparable in size to a small air switch,

3. Easy to install, using standard rail installation;

Advantages of box arrester:

Fire protection is better than modular, especially for unattended base stations this is particularly important;

Some of the performance is higher than the module type, especially the series type, its limiting voltage is lower, and the effect of surge voltage is much better.

The difference between the lightning protection module and the integrated lightning protection device:

Lightning protection module is also called modular lightning protection device, modular lightning protection device and integrated lightning protection device, because the two lightning protection device working principle is the same, the connection method is basically the same, although the performance, the price is very different, but the user is difficult to distinguish by the simple introduction of the manufacturer which is modular, which is integrated, more do not know which kind of lightning protection device is most suitable for themselves. The following is to introduce the difference between modular surge arrester and integrated surge arrester.

As mentioned earlier, the power supply lightning arrester we use now is basically a parallel type lightning arrester, one end of the lightning arrester is in parallel with the protected line, and the other end is grounded. Under normal circumstances, the lightning arrester should be kept open to the ground, but once the lightning arrester fails, it is possible to short circuit to the ground, resulting in line voltage loss, electric ignition and other accidents, the so-called trip device, simply put, is a device that is actively separated from the protected line when the lightning arrester fails.

According to the requirements of the national standard, all the power supply lightning arrester must have a trip device, which also from the side surface of the device for the normal work of the lightning arrester is of great significance, these are the differences between modular lightning arrester and integrated lightning arrester, whether integrated lightning arrester, or modular lightning arrester have a trip device, this is beyond doubt, However, the trip devices of the two are very different.

1. Trip device

As mentioned earlier, the power supply lightning arrester we use now is basically a parallel type lightning arrester, one end of the lightning arrester is in parallel with the protected line, and the other end is grounded. Under normal circumstances, the lightning arrester should be kept open to the ground, but once the lightning arrester fails, it is possible to short circuit to the ground, resulting in line voltage loss, electric ignition and other accidents, the so-called trip device, simply put, is a device that is actively separated from the protected line when the lightning arrester fails.

According to the requirements of the national standard, all the power supply lightning arrester must have a trip device, which also from the side surface of the device for the normal work of the lightning arrester is of great significance, these are the differences between modular lightning arrester and integrated lightning arrester, whether integrated lightning arrester, or modular lightning arrester have a trip device, this is beyond doubt, However, the trip devices of the two are very different.

2. Residual pressure

Before comparing the residual voltage, we must first make two things clear, first of all, the residual voltage is a changing value, it is proportional to the size of the current through the lightning arrester, the residual voltage marked by the lightning arrester is the average value measured under a fixed test standard, there are many such test standards, the same lightning arrester under different test standards, The residual pressure value is very different, so before comparing the residual pressure of two lightning protectors, we must first make sure that their residual pressure value is obtained under the same test standard, so that the comparison is meaningful;

Secondly, the size of the residual voltage is proportional to the starting voltage of the lightning arrester, the higher the starting voltage, the higher the residual voltage, and vice versa, in general, the ratio of starting voltage and residual voltage is closer to 1, the better its comprehensive performance.

3. Protection mode

The SPD prevents the device from being damaged by the overvoltage on the line. There are two types of line overvoltage: ———— Longitudinal overvoltage and transverse overvoltage. Longitudinal overvoltage refers to the overvoltage of the phase wire to the ground wire (L-PE) and the phase wire to the middle wire (N-PE), and transverse overvoltage refers to the overvoltage of the phase wire to the middle wire (L-N).

In this way, for the longitudinal overvoltage protection, we call longitudinal protection, for the horizontal overvoltage protection, we call horizontal protection, at the same time with two protection modes, it is called full protection, modular lightning protection each way protection is a separate lightning protection module, such as the single-phase power supply system shown in the figure above. The modular surge arrester needs 2 surge protection modules to achieve longitudinal protection, and 3 modules to achieve full protection, and the cost increases by 50%.

If it is a three-phase power supply system, the modular lightning arrester needs 4 lightning protection modules to achieve longitudinal protection, and 7 lightning protection modules to achieve full protection, the cost increases by 75%, compared to the modular lightning arrester in the realization of full protection function, the significant increase in cost, the integrated lightning arrester has a significant advantage. The unique multi-channel discharge structure of the integrated lightning arrester makes it possible to increase the horizontal protection function on the basis of vertical protection by using the principle of line reuse at a small amount of cost.

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