{"schemaVersion":1,"slug":"station-dc-feeder-selectivity-boundary","name":"Station DC feeder selectivity boundary","kind":"symbol","abbreviation":"SDFSB","aliases":["Station battery and charger distribution","substations Station battery and charger distribution","substations","Substations","DC feeder protective devices","Defined protection relationship"],"category":"measurement-protection","drawingTypes":["Schematic"],"referenceFamilies":["Manufacturer"],"summary":"Shows the protective-device relationship considered when assigning downstream DC fault isolation.","description":["Shows the protective-device relationship considered when assigning downstream DC fault isolation. 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 feeder protective devices” at the input and “Defined protection relationship” at the output. Selectivity requires a DC protection assessment.","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."],"readingNotes":["Start at the named input: DC feeder protective devices. Identify its source device or document and the state represented on the drawing.","Follow the named output: Defined protection relationship. Cross-reference its destination and separate the command from confirmation that the equipment responded.","Selectivity requires a DC protection assessment.","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."],"drawingChecklist":["Label the source and connection reference for dc feeder protective devices.","Identify the destination and defined state of defined protection relationship.","Record the equipment or control-document revision supporting this functional block.","Check this application limit in the project design: Selectivity requires a DC protection assessment."],"distinction":"Selectivity requires a DC protection assessment. 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":[{"label":"Representation","value":"Functional block"},{"label":"Installation focus","value":"Substations"},{"label":"Input / boundary","value":"DC feeder protective devices"},{"label":"Output / connection","value":"Defined protection relationship"},{"label":"Lookup label","value":"SDFSB is a library lookup label, not a standard device designation."}],"references":[{"sourceId":"pi26-station-dc","relevance":"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."}],"related":["ga-station-dc-battery-rack","ga-battery-charger","station-dc-dual-bus-segregation"],"artwork":"pi26-station-dc-feeder-selectivity-boundary","publishedOn":"2026-11-03","updatedOn":"2026-11-03","provenance":"independent-public-research","representation":{"type":"functional-block","focus":"substations","family":"station-battery","input":"DC feeder protective devices","output":"Defined protection relationship"},"plainEnglish":{"title":"What this block does","introduction":"Shows the protective-device relationship considered when assigning downstream DC fault isolation.","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 feeder protective devices” at the input and “Defined protection relationship” at the output. Selectivity requires a DC protection assessment.","drawings":"Start at the named input: DC feeder protective devices. Identify its source device or document and the state represented on the drawing. Follow the named output: Defined protection relationship. Cross-reference its destination and separate the command from confirmation that the equipment responded.","terms":[{"name":"Input","meaning":"DC feeder protective devices"},{"name":"Output","meaning":"Defined protection relationship"},{"name":"Application reference","meaning":"An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections."}],"diagram":"flow","steps":["DC feeder protective devices","SDFSB","Defined protection relationship"],"caption":"A reading guide. The entry's original illustration and input/output facts describe this application.","sources":[{"label":"MicroGenius S2/S4 battery charger technical manual","url":"https://www.sens-usa.com/hubfs/Controlled%20Files/Manuals/101330_MGS_User_Manual.pdf"}],"profileId":"power-installation-station-battery"},"url":"https://eloragrid.ai/symbols/station-dc-feeder-selectivity-boundary","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/station-dc-feeder-selectivity-boundary.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"pi26-station-dc","publisher":"SENS","title":"MicroGenius S2/S4 battery charger technical manual","url":"https://www.sens-usa.com/hubfs/Controlled%20Files/Manuals/101330_MGS_User_Manual.pdf","scope":"Battery charging modes, DC distribution interfaces and charger alarms.","type":"manufacturer","checkedOn":"2026-11-03","reuse":"link-only","relevance":"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."}]}