提出了单相变压器副绕组全励磁控制系统。
Come up with a single phase transformer full excitation system with secondly winding.
如果在铁芯上再装设曲折连接的副绕组，还可向变电所的低压负载供电。
The instrument can also supply low-voltage load of substation if zigzag connected second…
当电机作四极运转时，先按二极运转启动，然后切换开关使主绕组抽头A2与A4连接电机既作四极运转，此时副绕组开路。
When the motor runs in four-pole mode, it is started at two-pole mode and taps A2 and A4 are then connected together. In the meantime secondary winding is open.
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