过电压保护器三柱和四柱如何选择？在选择过电压保护器时，三柱和四柱的抉择需综合多方面因素。
How to choose between three column and four column overvoltage protectors? When selecting an overvoltage protector, the choice between three column and four column should take into account multiple factors.
三柱式过电压保护器结构相对简单，成本较低，适用于一般的电力系统保护。若系统三相电压较为平衡，且对保护精度要求不是特别高，三柱式可满足需求。
The structure of the three column overvoltage protector is relatively simple, the cost is low, and it is suitable for general power system protection. If the three-phase voltage of the system is relatively balanced and the requirements for protection accuracy are not particularly high, three column can meet the requirements.
四柱式过电压保护器则在保护性能上更为****。它能更****地检测和抑制过电压，尤其在三相电压不平衡或存在较多谐波的复杂工况下，能提供更可靠的保护。
The four column overvoltage protector has better protection performance. It can detect and suppress overvoltage more effectively, especially in complex working conditions with unbalanced three-phase voltage or high harmonic content, providing more reliable protection.
四柱式成本相对较高。因此，在选择时，应根据实际系统的运行条件、电压稳定性、预算等因素综合考量，以确保选用最合适的过电压保护器，保障电力系统的安全稳定运行。
The cost of the four pillar design is relatively high. Therefore, when choosing, comprehensive consideration should be given to the actual operating conditions, voltage stability, budget, and other factors of the system to ensure the selection of the most suitable overvoltage protector and guarantee the safe and stable operation of the power system.