main tapping
... main switchboard 总电量分配设备 main tapping 主抽头 main tapping 主轴头 ...
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主抽头(principal tapping), 此释义来源于网络辞典。
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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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