Requirements of power load at all levels for power supply: the first level load is an important load, which should be powered by two power sources. When one power source fails and stops working, the other power source should not be damaged at the same time. Especially important load in the first level load, in addition to the above two power sources, emergency power supply must be added. In order to ensure its power supply for particularly important loads, it is strictly prohibited to connect other loads to the emergency power supply system. The secondary load is also an important load, which should also be powered by two power sources, and there should be two power supply transformers. In case of any fault in one or the circuit, the secondary load will not interrupt the power supply, or it can quickly resume the power supply after interruption.<br>
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