When the secondary circuit is open, the core flux is produced by the primary current only. 当次级电路开路时，铁芯磁通量仅仅由初级电流产生。
The CAI can visually demonstrate the action process of the secondary circuit, which is very helpful to improve experimental inching quality. 该课件能直观地演示距离保护二次回路的动态过程，时提高实验教学质量是非常有帮助的。
Power loss in the inducer would trigger the deck's playback circuit. 诱导器的电力流失会激发终端的回放回路。
