main arc

On the basis of summarizing experimental results, the existing form of pilot arc and its stabilizing mechanism on main arc in plasma arc welding are discussed.

论述了等离子弧焊中维弧的存在形式及其对主弧的稳定机理，提出了解决主、维弧相互干涉的各种可能途径如采用断续维弧、交流维弧或使主、维弧具有不同通道及从维弧形态等方面提高主弧稳定性的具体措

Main Vacuum Interrupter (MVI) undertakes the rated current mainly, while Auxiliary Vacuum Interrupter (AVI) breaks the fault current.

主灭弧室(Main Vacuum Interrupter,MVI)主要承担额定电流,而辅助灭弧室(Auxilary VacuumInterrupter,AVI)主要承担开断故障电流的任务。