| The auxiliary DC control power system is considered the most crucial element of a protection, control, and monitoring system. The failure of the direct current (DC) control power can result in the inability of fault detection devices to identify faults, breakers to activate in response to faults, and the loss of functionality in local and remote indicator systems, among other consequences. In a number of cases, the direct current (DC) system lacks redundancy, hence emphasizing the paramount need of reliability in the whole design. The auxiliary direct current (DC) control power system encompasses several components, including the battery, battery charger, distribution system, switching and protective devices, as well as any monitoring equipment. The appropriate design, sizing, and maintenance of the many components of the direct current (DC) control power system are necessary. | 
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