Classification of lightning protection levels Traffic flow

20ka is the maximum throughflow!

AC surge protectors can also be used for DC, but note that their maximum operating voltage has changed! 130V (UCAC) AC surge protector can be used for 170V

UCDC).

Grade A: IMAX=120KA or more.

Grade B: IMAX=80KA or more.

Class C: IMAX=40KA or more.

Grade D: IMAX=20KA or more.

Class A refers to the flash receiver. For example, lightning rods.

Class B refers to the power lightning protection, this level B has no special regulations, in the past, there was also a limited voltage type of 20KA flow rate, but now it is basically about 80-120KA used, depending on the protection object.

Class C and Class D are also power lightning protection. In the case of pre-lightning protection, the flow can be reduced slightly.

Upstairs, don't mistake your children. If you don't know, don't talk nonsense. This rating is based on GB50343, electronic information lightning protection assessment, I don't remember the specifics, you can check GB50343 Chapter 2.

The classification method of GB50343-2004 lightning protection is as follows:

Clause. 1. The lightning protection of electronic information system is divided into four levels, according to the importance of the protected equipment or the results of lightning risk assessment, which are divided into A-level B-level C and D-level.

Clause. 2. If the lightning protection of buildings is divided into three categories, it shall be divided into one category according to the number of lightning strikes. Category II. Three categories.

1.Category I lightning protection buildings.

Buildings that manufacture, use or store a large number of dangerous substances such as explosives, gunpowder, initiating charges, pyrotechnics, etc., which can cause great damage or personal damage when exposed to electric sparks.

2.Category II lightning protection buildings.

1) Buildings protected under national key cultural relics;

2) National halls, office buildings, archives, large exhibition halls, international airports, large railway stations, international port passenger terminals, state guesthouses, large tourist buildings and large stadiums, etc.

3) National computing centers, communication hubs, and buildings with a large number of electronic devices of great importance to the national economy.

4) Manufacturing, using and storing hazardous substances, but electric sparks are not easy to cause, or do not cause great damage and personal life, such as paint manufacturing workshops, oxygen stations, flammable goods warehouses, etc. Zone 2, Zone 11 and some Zone 1 are classified as Class II lightning protection buildings.

5) There are ** dangerous open air gas tanks and oil tanks.

6) Ministerial and provincial office buildings and other important or densely populated public buildings with an estimated number of lightning strikes per year.

7) Residential, office buildings and other general civil buildings with an estimated number of lightning strikes per year.

3.Category III lightning protection buildings.

1) Provincial key cultural relics protection buildings and provincial archives.

2) Ministerial and provincial office buildings and other important or densely populated public buildings with an estimated number of lightning strikes equal to and greater than the number of lightning strikes per year, and less than or equal to the number of lightning strikes.

3) General civil buildings such as residential buildings and office buildings where the annual number of lightning strikes is expected to be greater than or equal to the number of lightning strikes, and less than or equal to the number of times.

4) General industrial buildings with an estimated number of lightning strikes greater than or equal to the number of lightning strikes per year.

5) Considering factors such as the consequences of lightning strikes and surrounding conditions, identify buildings in areas 21, 22, and 23 that require lightning protection.

6) Isolated and high-rise buildings such as chimneys and water towers with a height of 15 m or more in areas with an average annual thunderstorm day of 15 d a or more. Isolated and tall buildings such as chimneys and water towers with a height of 20 m or more in areas with an average annual thunderstorm day of 15 d a and below.

In the surge protection system, Class A is generally a 10 350 waveform switching surge protector, and it is an 8 20 waveform voltage limiting surge protector, the residual voltage of the switching surge protector is relatively high, generally more than 2kV, and the residual voltage of the voltage limiting surge protector is relatively low, generally a few hundred volts to 2kV. The protection of the pressure-limiting type is fine.

The lightning protection level has nothing to do with the current, only with the voltage.

According to the table in GB50343-2004. Let's sum it up.

The lightning protection of the power supply mainly depends on the lightning flux Imax (Ka), the protection level up (kV), and the maximum continuous working voltage un (V).

The maximum continuous working voltage is generally AC385V, and the maximum continuous working voltage of the final stage can be 320V or 275V.

The maximum lightning flux of class B shall not be less than 60kA, and the limiting voltage shall not be higher than 3kV;

The maximum lightning flux of grade C shall not be less than 40ka, and the limiting voltage shall not be higher than that of grade D, and the maximum lightning flux shall not be less than 20ka. The limiting voltage should not be higher than the maximum lightning flux of the last stage, which shall not be less than 10ka. The limiting voltage should not be higher.

There are two types of surge protectors: high-voltage and low-voltage surge protectors, and this section introduces the surge protectors (surge protector SPDs) in low-voltage power distribution systems

There are many types of surge protectors, and there are more than 100 kinds of lightning protectors in the Chinese market, and how to classify different brands and models of lightning protectors may be in front of us.

From the composition structure; There are several lightning arresters on the market now:

1) Clearance category——— open clearance, closed clearance.

2) Discharge tubes——— open discharge tubes, sealed discharge tubes, 3) Varistors - monolithic, multi-piece.

4) Suppression diodes.

5) Varistor gas discharge tube combination ---simple combination, complex combination 6) silicon carbide.

According to its protection properties, it can be divided into: open-circuit arrester, short-circuit arrester or switch type, voltage limiting type;

According to the working state (installation form), it can be divided into: parallel arrester and series arrester.

1.Surge protector, there are two key parameters of nominal flux and voltage protection level, to see that your nominal current should be enough, but I don't know what the voltage protection level is (must ?).

2.Surge protective devices must be filed with the local provincial meteorological bureau and within the validity period;

3.It may be possible that your surge protector is installed in the wrong place;

4.It is possible that the actual requirement is to install a switching surge protective device, and you are installing a pressure-sensitive one;

5.Most likely, you will build it yourself, and you will not outsource it to a qualified professional lightning protection unit, you know this.

I've been contracted here, and I've worked on a lot of big projects!

It's all right, it's all universal. The wiring is the same. I am Xiaoyang, a Deutsche Telecom brand lightning protection device manufacturer, and I am happy to serve you!

There are 4 differences between Level 1 and Level 2:

1. The current capacity of the first stage is different from that of the second stage, generally the overcurrent capacity of the first stage is much greater than that of the second stage, the first stage is mainly used for discharge, and the second stage is mainly used for voltage limiting.

2. The reaction time of the first stage is different from the second stage, and generally speaking, the switching type of the first stage SPD is slower than that of the limited voltage type.

3. The level of protection of the first level and the second level is also different, the first-level SPD can protect 100KA of lightning waves, while the second-level SPD can only protect 40KA of protection.

4. The installation position of the first level and the second level is not the same, generally speaking, a house, the first stage is installed in the distribution cabinet of the three-phase electric incoming line, and then the second level is installed on each floor.

The first and second levels are the energy of the overvoltage at the electrical equipment, the first level is large, and the second level is lower. So the primary discharge current is large.

The difference between the first and second level is the ability of the lightning protector to discharge the current, if it is not matched, it will not be able to protect the equipment. Shenzhen Tiandun lightning protection, He Gong...

According to the description of GB50343, if your outdoor cabinet is electrically connected and grounded well, it can play a certain shielding role, and the cabinet can be counted as LPZ1 area, otherwise it is 0 area. According to the description of the specification, the cabinet should belong to the LPZ0 1 junction area, and the nominal flow rate of the power surge protector A B C D four levels should be 80 60 50 50 KA respectively, in addition, when you consider this parameter, you must consider the residual pressure UP generated by SPD under this parameter, which should not be higher than 80% of the overvoltage resistance of your equipment. If you can't do both, it is advisable to prefer the right up

In fact, don't think so complicated, the power supply is divided into B, C, D levels, the signal is directly hit with the signal lightning protector on the line, ** use ** lightning protector, control signal on the control signal lightning protector, audio on the audio lightning protector, now are very matched, a ** to the lightning protection company, all at once to help you solve, do you still think about it? Hehe! Lightning protection is divided into two categories, direct lightning protection, induction lightning protection!