Protections for Data Centers

800 VDC direct-current (DC) architectures are emerging as a key enabler for next-generation AI data centers. This technical paper evolves around the new protection challenges coming with this shift.

Compared to traditional three-phase alternating current (AC) power distribution, DC has its advantages: simplified construction, improved conversion efficiency, reduced reactive power, and flexible integration of backup power and other energy sources.

On the other hand, DC power distribution also has its challenges, for example in power conversion and delivery, electromagnetic compatibility, or metering. It is capacitive in nature, with capacitors throughout the network connected to DC voltage and storing necessary operating energy. In case of faults, these capacitors quickly release stored energy. Consequently, fault current is greatly increased and DC voltage is disrupted, resulting in safety risks and system downtime.

This paper discusses the basics of protecting DC distribution for data centers, including wiring and grounding, protection devices, coordination, arc-flash mitigation, and ground-fault protection.

Authors:

Dr. Guang Yang, Director of R&D for Advanced Development, Siemens

Mike Tu, P.E., Principal Electrical Engineer, NVIDIA