상황
A substation needs a 120V DC auxiliary power single-line diagram showing a station battery bank, two battery chargers, a common DC distribution bus, and separately protected feeders for protection relays, SCADA, and control circuits.
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01
Represent battery chargers as DC source nodes feeding the 120V DC bus through dedicated output breakers
02
Connect the station battery to the same bus through a battery breaker so chargers and battery share the distribution panel
03
Protect each protection-relay and control feeder with an individual breaker to isolate faults without losing the whole DC bus
Use for substation DC auxiliary system design, relay panel power distribution, or as-built documentation of a 120V DC station service panel.