Double line-line voltage control
high-voltage line protection
zero voltage zero current switching
zero-voltage zero-current soft-switching
Zero-Voltage Zero-Current Switching
Zero-voltage zero-current transition
zero-voltage zero-current-switching
zero-voltage-zero-current
bus (voltage) regulator
Bus Line Diffential Protection
bus line network ad- justment
BUS PROTECTION
母线保护
模拟式母线保护
母线保护装置
总线保护
母差保护
总线保护继电
bus protection relaying