What is the difference between backup protectors and surge protectors?

When doing internal lightning protection, we usually pay attention to surge protectors, but often overlook SPD backup protectors. Actually, this is a very dangerous practice. Only by installing fuses or circuit breakers to power on and operate, if abnormal or overcurrent situations occur, it may cause serious accidents such as fires.

Therefore, we must recognize that the importance of backup protectors is no less than that of surge protectors. The backup protector can protect electrical equipment in the event of surge protector failure, fully ensuring the safe and stable operation of the power system. Only with comprehensive consideration of protective measures can the safety of the power system and equipment be guaranteed, and people's lives and property safety be fully protected.

What is the difference between backup protector and surge protector?

Surge protective device (SPD) is an important device used to protect terminal electrical equipment. It can carry current and protect equipment from damage when the circuit is subjected to lightning overvoltage and switching overvoltage. Under different voltage levels, system power supply line structures, and equipment locations, the design of surge protectors will adopt different multi-level designs. According to their functions, surge protectors are divided into pressure relief type and voltage limiting type. Through the pressure relief type, we can protect equipment in the 0 to 1 lightning protection zone from direct lightning strikes; The voltage limiting type is mainly used for induction lightning protection, which can discharge lightning current to the ground when an induction lightning strike occurs, and limit the line voltage to a lower level to ensure the safe operation of the equipment. The application of surge protective devices is crucial for the stable operation of protective equipment.

And backup protector (SSD) is an efficient and reliable circuit protection device used to protect circuit equipment from damage caused by electrical faults such as surges and overvoltage. It is in a very important position in the circuit, able to detect circuit faults in a timely manner and cut off power, thereby avoiding greater losses. Compared with traditional miniature circuit breakers, backup protectors are more flexible and intelligent, and can respond more quickly and accurately to various abnormal situations. With the help of backup protectors, we can provide more comprehensive and reliable protection for circuit equipment, and promote the continuous development of the electrical field.

When SPD is connected to the power system, it faces some challenges, but they can all be well addressed. Firstly, when lightning current passes through SPD, it generates power frequency current, which can cause SPD to overheat and burn. However, we can solve this problem by setting up an "overheat separator" in SPD. Secondly, if the surge current or overvoltage exceeds the tolerance value of SPD, it will not function. However, we can protect it by adding a backup protector (SSD) to the SPD circuit. In short, although SPD faces some difficulties, as long as we take the right measures, we can effectively solve them and enable SPD to play a better role in the power system.