What is the purpose of a surge protector?

Surge protector is a device commonly used to limit the overvoltage of lightning waves, and is commonly used in the power supply system of 220V and 380V power supply. According to the different working principles, surge protectors can be divided into two types: voltage switching surge protectors and voltage limited surge protectors.

1. Voltage switching surge protector.

Voltage-switching surge protectors exhibit high impedance when there is no surge, and when voltage surge occurs, it is abruptly mutated to low impedance. These protectors can reduce overvoltages to near zero, but must have a large through-current capacity. Common devices used as such surge protectors are effective discharge gaps, gas discharge tubes, thyristors and triacs at three terminals.

2. Voltage-limited surge protector.

Voltage-limited surge protectors exhibit high impedance in the absence of surges, but their impedance decreases as the inrush current and voltage increases. This type of protector will present a certain voltage when passing through the inrush current, which is called residual voltage or clamping voltage. Common devices used as such surge protectors include metal oxide varistors and transient voltage suppression diodes.

3. Application scenarios.

1.Surge protectors are usually connected in parallel with the equipment being protected, and their role is to release the overvoltage energy and limit the overvoltage to a level that the protected facility can withstand.

2.Different conditions of use have different requirements for the components used in surge protectors. As coarse protection, protection devices installed close to the entrance of the outer line require a large flow capacity, but allow for a high residual voltage.

As fine protection, devices for the protection of solid components in internal circuits require a lower limiting voltage and can have a lower current capability.

3."Surge" refers to the sudden appearance of an overvoltage and the large current that accompanies it. Surge protectors can also be used to limit transient overvoltages caused by electromagnetic induction and operation, so they can also be called overvoltage limiters.

Overvoltage limiters used in high-voltage power systems are called surge arresters.

Dikai Technology DK-50 lightning protection surge protector.

Dikai Technology DK-50 lightning protection surge protector.

The function of a surge protector is to prevent damage to electrical appliances caused by surges.

Surge protector, also known as lightning protector, is an electronic device that provides safety protection for various electronic equipment, instruments and meters, and communication lines. When the electrical circuit or communication line suddenly generates a peak current or voltage due to external interference, the surge protector can turn on and shunt in a very short time, so as to avoid the damage of the surge to other equipment in the circuit.

In addition to being used in the power sector, surge protectors are also necessary in other fields as a protective device to ensure that the equipment is not affected by power surges during the connection process.

How it works

Surge protection device (surge protection device) is an indispensable device in lightning protection of electronic equipment, which used to be often called "surge arrester" or "overvoltage protector", abbreviated as SPD in English. The surge protector limits the instantaneous overvoltage that penetrates into the power line or signal transmission line within the voltage range that the equipment or system can withstand, or discharges the powerful lightning current into the ground to protect the protected equipment or system from damage caused by shock.

The type and structure of the surge protector varies according to different uses, but it should contain at least one nonlinear voltage limiting element, and the basic components used for the surge protector are discharge gap, gas-charged discharge tube, varistor, suppression diode and choke coil, etc.

The function of the surge protector is to limit the instantaneous overvoltage that enters the power line and signal transmission line within the voltage range that the equipment or system can bear, or discharge the strong lightning current into the ground to protect the protected equipment or system from damage caused by impact. Surge protector, also known as lightning protector, is a kind of electric device that provides safety protection for various electronic equipment, instruments and meters, and communication lines.

Data development. The type and construction of a surge protector varies depending on the application, but it should contain at least one nonlinear voltage limiting element. The basic components used for surge protectors are:

Discharge gaps, gas-filled discharge tubes, varistors, suppression diodes, choke coils, etc.

The discharge gap, also known as the protection gap, is generally composed of two metal rods exposed to air separated by a certain gap, one of the metal rods is connected with the power phase line L1 or neutral line (N) of the required protection equipment, and the other metal rod is connected with the grounding wire (PE), when the instantaneous overvoltage hits, the gap is broken down, and a part of the overvoltage charge is introduced into the earth, so as to avoid the voltage rise on the protected equipment.

A gas discharge tube consists of a pair of cold negative plates that are separated from each other and encapsulated in a glass or ceramic tube filled with a certain amount of inert gas (AR). In order to increase the probability of triggering the discharge tube, there is also a co-trigger agent in the discharge tube. This type of gas discharge tube is available in the two-pole type and the three-polar type.

The varistor is a metal oxide semiconductor nonlinear resistor with ZNO as the main component, and when the voltage acting on both ends reaches a certain value, the resistance is very sensitive to voltage. It works in tandem with multiple semiconductors p-n. The suppression diode has the function of clamping voltage limiting, it is working in the reverse breakdown region, because it has the advantages of low clamping voltage and fast action response, it is especially suitable for use as the last few protection elements in the multi-level protection circuit.

In life, we can often see the shadow of the protector, but we don't know much about its role. So what is the purpose of a surge protector?

Its main function is to control the instantaneous overcurrent and voltage that suddenly rushes into the wire circuit and signal transmission line within the range that the equipment can bear, or to introduce a strong lightning current into the ground to ensure that the equipment or system can work safely and stably without damage caused by impact.

What are the characteristics of the surge protector:

1. The protection flow rate is large, the residual pressure is relatively low, and it can respond quickly.

2. The use of arc extinguishing technology can prevent fires.

3. Use temperature control protection circuit, and set up thermal protection inside.

4. Equipped with power status indication, which can display the working status of the protector.

5. The structure is relatively rigorous, and the performance is stable and reliable.

What are the classifications of surge protectors:

In terms of working principle, it can be divided into three types, namely voltage switching type, voltage limiting type and combination type.

1. Voltage switching type: when there is no instantaneous overvoltage, it is in a state of high impedance, if the lightning instantaneous overvoltage occurs in the line, it will automatically transform the high impedance into low impedance, so that the lightning current can pass smoothly, therefore, it is also known as "short circuit switch protector".

2. Voltage limiting type: when there is no instantaneous overvoltage, its state is high impedance, but with the continuous strengthening of current and voltage, its impedance will continue to decrease, so it is also known as "clamp protector".

3. Combined type: It is composed of voltage switch parts and voltage limiting parts, which has the unique characteristics of both.

Article summary: Well, what is the role of the surge protector and what are the characteristics of the surge protector The relevant knowledge is introduced here, if you need more information, please continue to pay attention to Qeeka Home, and we will have better and more exciting content for you in the future.