When there are more than two electric water pumps, their power supply should use electricity from different mother line of the power system.
当有两台以上电动给水泵时，给水泵的电源应从厂用电系统不同的母线段取得。
Secondly, the paper designs and realizes the two level variable frequency heating power supply with line of 380V.
随后，本文给出了380V电源供电的二电平变频加热电源的主电路和控制电路的设计与实现。
Two or two-circuit transmission line power supply should be able to automatic switching, self-generating equipment should be installed automatically activated.
两个电源或两回线路应能自动切换，自备发电设备应有自动启动装置。
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