过电压保护器是一种重要的电气保护装置，其主要作用在于限制电力系统中可能出现的各种过电压。
Overvoltage protector is an important electrical protection device, whose main function is to limit various overvoltages that may occur in the power system.
在电力系统运行中，由于雷击、操作、故障等原因，会产生暂态过电压和操作过电压。这些过电压可能会对电气设备的绝缘造成严重损害，影响设备的正常运行，甚至导致设备烧毁
During the operation of the power system, transient overvoltage and operational overvoltage may occur due to lightning strikes, operations, faults, and other reasons. These overvoltages may cause serious damage to the insulation of electrical equipment, affect the normal operation of the equipment, and even lead to equipment burnout
过电压保护器能够迅速动作，将过电压限制在设备能够承受的安全范围内，保护诸如变压器、开关柜、电缆等重要电气设备免受过电压的冲击。同时，它还能降低过电压引发的电力系统故障概率，提高供电的可靠性和稳定性，保障电力系统的安全、稳定、经济运行。
Overvoltage protectors can quickly operate to limit overvoltage within the safe range that the equipment can withstand, protecting important electrical equipment such as transformers, switchgear, cables, etc. from the impact of overvoltage. At the same time, it can also reduce the probability of power system failures caused by overvoltage, improve the reliability and stability of power supply, and ensure the safe, stable, and economical operation of the power system.