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8.5.1.7 DC and Uninterruptible Power Supply Systems
The uninterruptible power supply consists of 125 V DC (battery and charger), and 480 V AC (inverter) systems.
The 125 V DC system provides power for designated consumers (e.g. emergency oil pumps, protection, control voltage, inverter feeding).
The 125 V DC system consists of 2x100% battery chargers connected via individual fuses to one 100% battery. One battery charger is supplied from the normal AC system; the other one is supplied from the emergency diesel AC bus. The battery has an adequate capacity to supply the emergency loads for 2 hours.
The 24 V DC system is powered via 2x100% redundant DC/DC converters. Their feeding is taken from the 125 V DC battery system. Main consumers of 24 V DC are the main DCS cabinets. Each I&C cabinet is designed to receive two feedings from the redundant DC/DC converters via decoupling diodes

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