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With the continuous accelerating of intelligent factory and the demands of electrical supply system, high reliable, stable and high-quality power supply is the important guarantee to ensure the safe and reliable, stable and intelligent power supply and distribution of the whole plant. Therefore, the active and important considering factor is how to monitor, control and protect the electric system and how to manage the power utilization and electric under normal situation and accident situations. The special UPS for electric and direct current cabinet system are mainly used to provide direct and current uninterrupted power supply for nuclear power plant, thermal power plant, hydraulic power plant, and other types of power plants. It is required to guarantee the safe and reliable operation of main power house, relay room, MIS system, and other important control equipment.