Surge Arrester - Click Here To Learn More
With the rapid development of electronic information technology, the continuous increase and expansion of intelligent devices and signal equipment make the safety environment required by people when using these devices particularly important. In our lives, surge protection device are often used to protect equipment safety. Today, the editor will take you to talk about surge protector and understand what surge protective device are.
Surge lightning protectors (SPDs) are electronic devices that provide safety protection for various electronic equipment, instruments and meters, and communication lines. When the input end of the power supply system receives a large surge (more than 1000V), the energy absorption device and discharge tube inside the surge lightning protector will be broken down and act due to their own characteristics. The pulse energy can be quickly consumed by the device in the line circuit (commonly known as differential mode protection) or discharged to the ground (commonly known as common mode protection), and the rear residual pressure pulse is attenuated to a safe value below the voltage that the electrical equipment can withstand, so as to prevent the electrical equipment at the rear end from being impacted by the surge, thereby protecting the electrical equipment at the rear end.
From the perspective of circuit connection, surge arresters can be divided into series surge arresters and parallel surge arresters.
The series surge arrester is used in series with the back-end electrical equipment. After the surge is transmitted through the power supply line, it is discharged through the internal device, so that the surge peak value borne by the back-end equipment is lower than the withstand voltage of the electrical equipment itself, achieving the effect of surge protection. High-quality surge arresters have built-in dual-line temperature and current protection safety tripping devices. When the surge arrester is aged, the device can be automatically cut off to avoid fire or short-circuit disasters; at the same time, when the load end is overloaded, the power supply circuit can also be cut off to protect the back-end electrical equipment.
The characteristic of the parallel surge arrester is that damage will not cut off the power supply system, and the electrical equipment can be powered as usual. However, when the parallel type surge arrester ages, or encounters a surge that exceeds its own lightning protection strength, the surge arrester will be damaged and fail. At this time, the back-end equipment will directly bear the next incoming surge impact, which will cause impact damage to the back-end electrical equipment!
In order to reduce the surge protection defects caused by the shortcomings of the parallel type surge arrester, the editor recommends that the parallel type surge arrester be installed at the front end far away from the back-end electrical equipment, as close as possible to the incoming end of the wave, so as to increase the back-end line impedance. The back-end line distance is equivalent to setting up decoupling. After the surge is introduced, it is consumed on the surge arrester nearby, reducing the tolerance pressure of the back-end electrical equipment.
