Terms for subject Electric machinery containing back up

English	Chinese
back up	支撑
back-up	挡块
back-up device	辅助设备
back-up fuse	备用熔断器
back-up plan	备用方案
back-up protection	后备保护装置
back-up relay	后备继电器
back-up relaying	后备继电保护
back-up safety device	后备安全设备
back-up safety device	备用安全装置
back-up source	后备电源
back-up source auxiliary power supply	备用电源
back-up source emergency power supply	备用电源
frequency back-up control	频率辅助控制