双电源转换开关
dual power transfer switch
双电源转换控制器
double power switch controller
双电源自动转换
double power-supply automatic transferring
双电源双回线
double- circuit line with power source at each end
电源转换箱
power supply transverse box
主备电源转换装置
switching device for main and standby power sources
自动电源转换开关
automatic power transfer switchgear
单电源双回线
double- circuit line with a power source at one end
单电源双丝
double wire with single power
单电源双丝埋弧焊
single power source twin-wire submerged arc weldin
单负载-双电源
Single-load Double-source