{"schemaVersion":1,"slug":"microgrid-earthing-switch-feedback-supervisor","name":"Microgrid earthing-switch feedback supervisor","kind":"symbol","abbreviation":"MEFS","aliases":["Microgrid topology and earthing coordination","microgrids Microgrid topology and earthing coordination","microgrids","Microgrids","Earthing command and position","Earthing-state discrepancy alarm"],"category":"microgrid-systems","drawingTypes":["Schematic"],"referenceFamilies":["Manufacturer"],"summary":"Checks the selected earthing-device state against the mode-dependent scheme's expected condition.","description":["Checks the selected earthing-device state against the mode-dependent scheme's expected condition. 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 “Earthing command and position” at the input and “Earthing-state discrepancy alarm” at the output. The underlying sequence requires validated design.","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: Earthing command and position. Identify its source device or document and the state represented on the drawing.","Follow the named output: Earthing-state discrepancy alarm. Cross-reference its destination and separate the command from confirmation that the equipment responded.","The underlying sequence requires validated design.","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 earthing command and position.","Identify the destination and defined state of earthing-state discrepancy alarm.","Record the equipment or control-document revision supporting this functional block.","Check this application limit in the project design: The underlying sequence requires validated design."],"distinction":"The underlying sequence requires validated design. 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":"Earthing command and position"},{"label":"Output / connection","value":"Earthing-state discrepancy alarm"},{"label":"Lookup label","value":"MEFS 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-protection-setting-group-request"],"artwork":"pi26-microgrid-earthing-switch-feedback-supervisor","publishedOn":"2026-11-03","updatedOn":"2026-11-03","provenance":"independent-public-research","representation":{"type":"functional-block","focus":"microgrids","family":"microgrid-topology","input":"Earthing command and position","output":"Earthing-state discrepancy alarm"},"plainEnglish":{"title":"What this block does","introduction":"Checks the selected earthing-device state against the mode-dependent scheme's expected condition.","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 “Earthing command and position” at the input and “Earthing-state discrepancy alarm” at the output. The underlying sequence requires validated design.","drawings":"Start at the named input: Earthing command and position. Identify its source device or document and the state represented on the drawing. Follow the named output: Earthing-state discrepancy alarm. Cross-reference its destination and separate the command from confirmation that the equipment responded.","terms":[{"name":"Input","meaning":"Earthing command and position"},{"name":"Output","meaning":"Earthing-state discrepancy alarm"},{"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":["Earthing command and position","MEFS","Earthing-state discrepancy alarm"],"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-earthing-switch-feedback-supervisor","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/microgrid-earthing-switch-feedback-supervisor.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."}]}