A Brief Discussion On The Principle And Application Of Surge Protectors - What Experts Say
Surge protector, also known as surge, surge, or SPD for short, is an electronic device that provides safety protection for various electronic equipment, instruments, and communication lines. It is mainly used to limit overvoltage and discharge surge current. Surge protector is generally connected in parallel with the protected equipment. When overvoltage occurs, it can play the role of shunting and voltage limiting. Prevent excessive current and voltage from damaging the equipment.
The core component of the surge protector is a nonlinear element inside. According to the different nonlinear elements, surge protectors can be divided into switch type (the core component is mainly a discharge gap) and voltage limiting type (the core component is mainly a varistor). Although the working principles of the discharge gap and the varistor are different, their basic characteristics are very similar: when there is no overvoltage, their impedance is very high, generally in the megohm level, which is almost equivalent to a circuit breaker, and has no effect on the operation of the equipment. When overvoltage occurs, the impedance drops rapidly to a few ohms, and the surge current will pass through the surge protector to the ground instead of entering the equipment. At the same time, because the impedance of the surge protector is very small at this time, the voltage at both ends of it is also relatively small. At the same time, because it is connected in parallel with the protected equipment, it prevents the equipment from being subjected to a large surge voltage. In this way, the effect of current discharge and voltage limiting is achieved.
surge protection device are widely used. From residential electricity to industrial automation, surge protectors are needed to protect electrical equipment. Surge protectors can be used to protect AC power supplies and various types of equipment, including computers, communication equipment, household appliances, etc. In industrial automation, surge protectors can be used to protect PLCs (programmable logic controllers), industrial instruments, and motor drivers. In residential electricity, surge protectors can be used to protect household appliances such as televisions, computers, refrigerators, and washing machines.
surge protective device are protective devices for electrical and electronic equipment, mainly to prevent damage to electrical equipment caused by sudden lightning currents in the power system, excessive voltages, and instantaneous current changes. The main function of a surge protector is to create a short, low-impedance path in the circuit so that the overvoltage or overcurrent can be instantly shunted to the ground or other places that can withstand the voltage, thereby protecting the equipment.
The principle of a surge protector is based on the simple fact that when current passes through an inductor, the inductor resists current changes. The surge protector takes advantage of this principle and contains an inductor and a capacitor in parallel. When an overvoltage or overcurrent strikes, a potential difference is generated between the capacitor and the inductor, causing the capacitor to charge. When the charged voltage exceeds the rated voltage of the surge protector, the capacitor will discharge and shunt the overvoltage or overcurrent to the ground or other places that can withstand the voltage. In short, a surge protector is a very important protective device that can protect electrical equipment from damage caused by sudden overvoltage, instantaneous current changes, and other factors in the power system.
