保护双重化
Protection dual configuration
double protection
超长双护筒
super-length double casing
电弧光保护双判据
arc protection double criterions
继电保护双重化
125MW generator-transformer unit
母线保护双重化
duplex configuration of bus protection
双MCU双频网络节点
node with double MCU and double frequency
双双完全正则
Pairwise completely regular
双双自杀
committing suicide in pairs
反差控制紫外线防护护目镜
ultraviolet contrast-control safety goggles