What Is a Cable Surge Protector?
Surge protector, also called lightning arrester, is an electronic device that provides safety protection for various electronic equipment, instruments and communication lines. When a sudden current or voltage is suddenly generated in the electrical circuit or communication line due to external interference, the surge protector can conduct shunt in a very short time, thereby avoiding the damage of the surge to other equipment in the circuit.
- 1,
- The most primitive surge protector with horn-shaped gaps, appeared in the late 19th century and was used for
- introduction
- Lightning disasters are one of the most serious natural disasters, and there are countless casualties and property losses caused by lightning disasters in the world every year. With electronics,
- Surge protection device (Surge protection Device)
- Discharge gap (also known as protection gap):
- It generally consists of two metal rods that are exposed to the air with a certain gap. One of the metal rods is connected to the power phase line L1 or the neutral line (N) of the equipment to be protected, and the other metal rod is connected to the ground line ( PE) phase connection. When the transient overvoltage hits, the gap is broken down, and a part of the overvoltage charge is introduced into the ground, which prevents the voltage on the protected equipment from rising. The distance between the two metal rods of such a discharge gap can be adjusted as required, and the structure is relatively simple. Its disadvantage is poor arc extinguishing performance. The improved discharge gap is an angular gap. Its arc extinguishing function is better than the former. It is extinguished by the electric force F of the circuit and the rise of the hot air flow.
- Gas discharge tube:
- It consists of a pair of cold cathode plates separated from each other and enclosed in a glass tube or ceramic tube filled with a certain inert gas (Ar). In order to increase the triggering probability of the discharge tube, a trigger agent is also provided in the discharge tube. There are two types of gas-filled discharge tubes:
- The technical parameters of the gas discharge tube are: DC discharge voltage Udc;
- 1. SPD general installation requirements
- Surge protector is installed with 35MM standard rail
- For fixed SPDs, the following steps should be followed for regular installation:
- 1) Determine the discharge current path
- 2) Mark the extra caused at the device terminal
- Lightning discharges can occur between or within clouds, or between clouds and ground; internal surges caused by the use of many large-capacity electrical equipment, and power supply systems (Chinese low-voltage power supply system standards: AC 50Hz 220 / 380V) and The impact of electrical equipment and the protection against lightning and surges have become the focus of attention.
- The lightning discharge between the cloud layer and the ground consists of one or several separate lightning strokes, each of which carries a number of currents of high amplitude and short duration. A typical lightning discharge will consist of two or three lightning strikes, with approximately one-twentieth of a second between each lightning strike. Most lightning currents fall between 10,000 and 100,000 amps, and their duration is typically less than 100 microseconds.
- Due to the use of large-capacity equipment and frequency conversion equipment in the power supply system, internal surge problems have become increasingly serious. We attribute it to the effects of transient overvoltage (TVS). There is a permissible range of supply voltage for any electrical equipment. Sometimes even a narrow overvoltage surge can cause damage to the power supply or all of the equipment. This is the case for transient overvoltage (TVS) destruction. Especially for some sensitive microelectronic equipment, sometimes a small surge can cause fatal damage. [1]
- Surges are also called surges, as the name suggests is an instantaneous overvoltage that exceeds the normal operating voltage. In essence, a surge is a violent pulse that occurs in just a few millionths of a second. Possible causes of the surge are: heavy equipment, short circuits, power switching or large engines. Products that contain surge arresters can effectively absorb sudden huge amounts of energy to protect connected equipment from damage.