How much do you know about the basic knowledge of power surge arresters? Power supply lightning arrester (SPD) alias zinc oxide arrester, surge protector, surge protector. In today's information age, computer networks and communication equipment are becoming more and more sophisticated, and their office environment regulations are getting higher and higher.

The lightning strikes and the momentary overvoltage of large and medium-sized electrical equipment will more and more frequently invade electrical equipment and computer equipment in the room according to the switching power supply, wireless antenna, wireless communication data signal collection and transmission equipment and other routes, resulting in mechanical equipment or Electronic devices are destroyed, casualties, data and information transmitted or stored are affected or lost, and even electronic products cause incorrect operation or temporary hemiplegia, interruption of system software, interruption of data transmission, and destruction of local area networks and even wide area networks. The damage is shocking, and the indirect damage generally far exceeds the immediate property loss. The power lightning protector refers to the equipment that avoids being struck by lightning based on contemporary thermal and other technologies.

The classification of power supply lightning arrester:

(1) Power switch type lightning protection module: Its principle is to show high characteristic impedance when there is no instantaneous overvoltage, but once it responds to the lightning strike, its characteristic impedance suddenly changes to a low value and easy to consume, allowing lightning strikes. by. As such equipment, the components include: charge and discharge gap, gas discharge tube, thyristor, etc.

(2) Voltage-limiting board lightning protection module: its principle is high characteristic impedance when there is no instantaneous overvoltage, but with the increase of surge current and working voltage, its characteristic impedance will continue to decrease, and its current intensity characteristics are obviously discrete system. As the components of this type of equipment, there are: active zinc oxide, zinc oxide varistor, suppression diode, avalanche diode and other lightning protection modules, most of which are voltage-limiting boards.

(3) Separate type or choke type lightning protection module: Separate type: It is connected in series with the equipment to be maintained, and exhibits low characteristic impedance to a single pulse of lightning and high characteristic impedance to all normal output power. Choke type: It is connected in series with the equipment to be maintained, and exhibits high characteristic impedance to a single pulse of lightning, and low characteristic impedance to all normal output power. As the components of this type of equipment, there are choke coils, high-pass filters, low-pass filters, 1/4 optical wavelength short-circuit devices, etc.

(4) According to lightning protection level: Level 1 lightning protection module: The general tolerance is above 30KA. There are power switch type and pressure limiting type board. Secondary lightning protection module: The general tolerance is in the middle of 15-20KA. All are pressure-limiting plates. Three-level lightning protection module: The general standard generally has a tolerance of 5-10KA, and they are all pressure-limiting boards.