{"schemaVersion":1,"slug":"microgrid-topology-dependent-reserve-aggregation","name":"Microgrid topology-dependent reserve aggregation","kind":"symbol","abbreviation":"MTRA","aliases":["Microgrid topology and earthing coordination","microgrids Microgrid topology and earthing coordination","microgrids","Microgrids","Island membership and resource margins","Island operating reserve"],"category":"microgrid-systems","drawingTypes":["Schematic"],"referenceFamilies":["Manufacturer"],"summary":"Calculates resource margin only for the resources connected to the assigned island.","description":["Calculates resource margin only for the resources connected to the assigned island. Microgrid topology control tracks which sources and load sections are electrically connected. The same physical installation can form several islands, so source roles, measurement boundaries and earthing interfaces must follow the established configuration.","In a microgrid with sectionalized buses, the controller can associate each connected source and load group with its current island. A mode-dependent neutral or protection interface needs its own independently validated design. For this reference, the drawing identifies “Island membership and resource margins” at the input and “Island operating reserve” at the output. Remote disconnected capacity is not available reserve.","Keep measured switch positions, logical island assignment and any earthing command separate. A conceptual topology block cannot establish a safe neutral-switching arrangement or prove that a circuit is de-energized. 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: Island membership and resource margins. Identify its source device or document and the state represented on the drawing.","Follow the named output: Island operating reserve. Cross-reference its destination and separate the command from confirmation that the equipment responded.","Remote disconnected capacity is not available reserve.","Keep measured switch positions, logical island assignment and any earthing command separate. A conceptual topology block cannot establish a safe neutral-switching arrangement or prove that a circuit is de-energized."],"drawingChecklist":["Label the source and connection reference for island membership and resource margins.","Identify the destination and defined state of island operating reserve.","Record the equipment or control-document revision supporting this functional block.","Check this application limit in the project design: Remote disconnected capacity is not available reserve."],"distinction":"Remote disconnected capacity is not available reserve. 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":"Microgrids"},{"label":"Input / boundary","value":"Island membership and resource margins"},{"label":"Output / connection","value":"Island operating reserve"},{"label":"Lookup label","value":"MTRA is a library lookup label, not a standard device designation."}],"references":[{"sourceId":"pi26-mg-modes","relevance":"Public technical context for microgrid topology and earthing coordination. Grid-connected and island modes, transitions, topology and authority. The application text and educational graphic are independently authored; the publisher does not certify this representation."}],"related":["microgrid-interconnection-switch","neutral-earthing-resistor","microgrid-topology-change-event-interface"],"artwork":"pi26-microgrid-topology-dependent-reserve-aggregation","publishedOn":"2026-11-03","updatedOn":"2026-11-03","provenance":"independent-public-research","representation":{"type":"functional-block","focus":"microgrids","family":"microgrid-topology","input":"Island membership and resource margins","output":"Island operating reserve"},"plainEnglish":{"title":"What this block does","introduction":"Calculates resource margin only for the resources connected to the assigned island.","example":"In a microgrid with sectionalized buses, the controller can associate each connected source and load group with its current island. A mode-dependent neutral or protection interface needs its own independently validated design. For this reference, the drawing identifies “Island membership and resource margins” at the input and “Island operating reserve” at the output. Remote disconnected capacity is not available reserve.","drawings":"Start at the named input: Island membership and resource margins. Identify its source device or document and the state represented on the drawing. Follow the named output: Island operating reserve. Cross-reference its destination and separate the command from confirmation that the equipment responded.","terms":[{"name":"Input","meaning":"Island membership and resource margins"},{"name":"Output","meaning":"Island operating reserve"},{"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":["Island membership and resource margins","MTRA","Island operating reserve"],"caption":"A reading guide. The entry's original illustration and input/output facts describe this application.","sources":[{"label":"Microgrid operating modes and transitions management","url":"https://productinfo.se.com/emol_functional_specifications/doca0371_emol_functionalspecifications/EN/DOCA0371_EMOL_Functional_Specifications_DD00894746.xml/%24/EMOL_OperatingModesandTransitionsManagement_DD00895904"}],"profileId":"power-installation-microgrid-topology"},"url":"https://eloragrid.ai/symbols/microgrid-topology-dependent-reserve-aggregation","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/microgrid-topology-dependent-reserve-aggregation.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"pi26-mg-modes","publisher":"Schneider Electric","title":"Microgrid operating modes and transitions management","url":"https://productinfo.se.com/emol_functional_specifications/doca0371_emol_functionalspecifications/EN/DOCA0371_EMOL_Functional_Specifications_DD00894746.xml/%24/EMOL_OperatingModesandTransitionsManagement_DD00895904","scope":"Grid-connected and island modes, transitions, topology and authority.","type":"manufacturer","checkedOn":"2026-11-03","reuse":"link-only","relevance":"Public technical context for microgrid topology and earthing coordination. Grid-connected and island modes, transitions, topology and authority. The application text and educational graphic are independently authored; the publisher does not certify this representation."}]}