DC arc flash is a critical safety concern in modern electrical systems, particularly with the rise of direct current (DC) applications in electric vehicles (EVs), solar photovoltaic (PV) systems, battery energy storage systems (BESS), and data centers. DC arc flash involves unique challenges due to its continuous energy release.
DC arc faults are one of the main obstacles to the large-scale application of electric vehicles and energy storage stations . In the battery system of energy storage stations, a DC arc fault may be caused by a loose electrical connection, aging and damaged insulation, a lack of regular maintenance, and human error.
In addition to physical characteristics, a DC arc will generate specific electrical signals in the circuit . Arc faults in battery systems can also be detected by extracting the characteristics of electrical signals.
However, there is currently no standard DC arc protection system for battery systems. This section considers the voltage levels of the battery system and discusses the DC arc protection systems at the three levels of individual cells, battery modules, and battery packs, as shown in Fig. 12.
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