Aiming at mangling of electron equipment due to transient over voltage from thunder and operation between 4 and 3+1 source defend thunder equipments is discussed.

• 针对雷电和操作过电压所引起瞬间过电压对电子设备系统的损坏,探讨加装电源防雷器时采用四模块和3+1模块时的性能,并进行比较和分析。