Common problems of lightning protection and grounding Principle of two-in-one lightning protection device

Lightning protection and grounding is both a systematic project and a dangerous project. Direct lightning strikes will directly harm the human body, and induction lightning will cause huge impact on equipment and damage equipment in the equipment room. Therefore, understanding basic lightning protection and grounding knowledge is not only very good The protective equipment in the computer room can better protect the personal safety of employees.

1. Types and functions of arresters:

Commonly used arresters are valve type, exhaust type, zinc oxide, etc. The arrester is used to prevent lightning overvoltage from intruding into the substation or other buildings along the line so as not to endanger the insulation of the protected object. Now, zinc oxide arresters are often used outside the distribution room, and valve arresters are often used indoors.

2. The concept of safe current:

The safe current refers to the maximum escape current after the human body is electrocuted. The safety current lightning arrester stipulated in my country is 30 mA. The safe current is related to factors such as the duration of the shock, the nature of the current, the path of the current, and weight and health.

3. Safety voltage concept:

The safety zone voltage refers to the voltage that does not cause direct death or disability. The safety extra-low voltage stipulated in my country is 36 volts.

4. The concept of earth:

The electrical ground refers to the place where the potential is zero; this ground generally refers to the place about 20 meters away from the ground fault point.

5. The concept of working grounding and protective grounding:

The grounding to ensure that the power system and equipment meet the requirements of normal operation is called working grounding. The grounding performed to protect personal safety and prevent indirect electric contact is called protective grounding. For example: the grounding of the neutral point of the transformer, the grounding of the air-termination device and the arrester is the working ground. The grounding of the secondary side terminal of the transformer and the grounding of the equipment surge protector shell are protective grounding.

The 2-in-1 lightning arrester is divided into an analog 2-in-1 arrester and a network 2-in-1 arrester. The analog 2-in-1 arrester is used to protect analog cameras, and the network 2-in-1 arrester protects digital IP network cameras.

Mainly used for lightning protection of guns.

The lightning protection device is connected in series between the signal channel and the camera, so what is the principle of the two-in-one lightning protection device? Let me analyze it for you:

The working principle of the two-in-one lightning arrester is to use a high-resistance open-circuit state to the ground at low voltage, and a low-resistance short-circuit state to the ground at high voltage. The internal use of multi-level lightning protection devices, such as discharge tubes, varistors, TVS, resistors, etc., the use of lightning protection devices in series is only the physical surface form of the two-in-one lightning protection device, and most of its main lightning protection components are are connected in parallel in the system.
Uchi is a leading manufacturer and solution provider of lightning arresters and surge protectors, providing lightning protection equipment such as DC and AC power surge protectors - computer room network monitoring signal and video two-in-one arresters to the world.