# Station DC bus-tie operating interface Canonical URL: https://eloragrid.ai/symbols/station-dc-bus-tie-operating-interface Publisher: Elora Grid Updated: 2026-11-03 Lookup label: SDBOI Drawing use: Schematic Reference families: Manufacturer Representation: Functional block Installation focus: substations Input: DC tie command and states Output: Assigned bus-tie action Identifies the command and conditions associated with the selected DC bus connection. ## In plain English ### What this block does Identifies the command and conditions associated with the selected DC bus connection. ### A simple example In a substation control building, the battery can support breaker trip circuits while the charger AC supply is unavailable. Supervision must identify whether the charger, battery or a downstream feeder is affected. For this reference, the drawing identifies “DC tie command and states” at the input and “Assigned bus-tie action” at the output. DC-source compatibility must be assessed. ### What the drawings help you do Start at the named input: DC tie command and states. Identify its source device or document and the state represented on the drawing. Follow the named output: Assigned bus-tie action. Cross-reference its destination and separate the command from confirmation that the equipment responded. ### Terms - Input: DC tie command and states - Output: Assigned bus-tie action - Application reference: An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections. Concept diagram: DC tie command and states → SDBOI → Assigned bus-tie action A reading guide. The entry's original illustration and input/output facts describe this application. - [MicroGenius S2/S4 battery charger technical manual](https://www.sens-usa.com/hubfs/Controlled%20Files/Manuals/101330_MGS_User_Manual.pdf) ## What it represents Identifies the command and conditions associated with the selected DC bus connection. A station battery system supplies protection, control and other assigned DC loads through a documented charger and distribution arrangement. Charger output, battery contribution and load distribution are related but separately monitored paths. In a substation control building, the battery can support breaker trip circuits while the charger AC supply is unavailable. Supervision must identify whether the charger, battery or a downstream feeder is affected. For this reference, the drawing identifies “DC tie command and states” at the input and “Assigned bus-tie action” at the output. DC-source compatibility must be assessed. Identify every source, protective device, isolation boundary and return. Battery capacity, DC fault duty, charging settings and ventilation require the selected battery-system design; illustrative circuits do not establish autonomy. The functional block is an independent explanation of this named application. Equipment-specific ratings, terminal connections and operating conditions must be established in the project documentation. ## How to read it - Start at the named input: DC tie command and states. Identify its source device or document and the state represented on the drawing. - Follow the named output: Assigned bus-tie action. Cross-reference its destination and separate the command from confirmation that the equipment responded. - DC-source compatibility must be assessed. - Identify every source, protective device, isolation boundary and return. Battery capacity, DC fault duty, charging settings and ventilation require the selected battery-system design; illustrative circuits do not establish autonomy. ## Information to show or reference - Label the source and connection reference for dc tie command and states. - Identify the destination and defined state of assigned bus-tie action. - Record the equipment or control-document revision supporting this functional block. - Check this application limit in the project design: DC-source compatibility must be assessed. ## Important distinction DC-source compatibility must be assessed. This reference describes the named application; it does not establish a new IEC graphical symbol, an ANSI device-function number or an exact manufacturer connection diagram. ## Facts - Representation: Functional block - Installation focus: Substations - Input / boundary: DC tie command and states - Output / connection: Assigned bus-tie action - Lookup label: SDBOI is a library lookup label, not a standard device designation. ## Public references - [MicroGenius S2/S4 battery charger technical manual](https://www.sens-usa.com/hubfs/Controlled%20Files/Manuals/101330_MGS_User_Manual.pdf) — SENS. Public technical context for station battery and charger distribution. Battery charging modes, DC distribution interfaces and charger alarms. The application text and educational graphic are independently authored; the publisher does not certify this representation. ## Graphic scope Independent original educational concept illustration by Elora Grid. Not a certified standards graphic or manufacturer footprint. Unitless; not to scale. Original artwork licence: https://creativecommons.org/licenses/by/4.0/. Publisher material is linked only.