{"schemaVersion":1,"slug":"microgrid-topology-change-event-interface","name":"Microgrid topology change event interface","kind":"symbol","abbreviation":"MTCEI","aliases":["Microgrid topology and earthing coordination","microgrids Microgrid topology and earthing coordination","microgrids","Microgrids","Switching-state transitions","Topology change event"],"category":"microgrid-systems","drawingTypes":["Schematic"],"referenceFamilies":["Manufacturer"],"summary":"Reports confirmed connectivity changes to the assigned control and event-recording systems.","description":["Reports confirmed connectivity changes to the assigned control and event-recording systems. 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 “Switching-state transitions” at the input and “Topology change event” at the output. Transition quality and time reference need identification.","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: Switching-state transitions. Identify its source device or document and the state represented on the drawing.","Follow the named output: Topology change event. Cross-reference its destination and separate the command from confirmation that the equipment responded.","Transition quality and time reference need identification.","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 switching-state transitions.","Identify the destination and defined state of topology change event.","Record the equipment or control-document revision supporting this functional block.","Check this application limit in the project design: Transition quality and time reference need identification."],"distinction":"Transition quality and time reference need identification. 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":"Switching-state transitions"},{"label":"Output / connection","value":"Topology change event"},{"label":"Lookup label","value":"MTCEI 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-bus-section-connectivity-tracker"],"artwork":"pi26-microgrid-topology-change-event-interface","publishedOn":"2026-11-03","updatedOn":"2026-11-03","provenance":"independent-public-research","representation":{"type":"functional-block","focus":"microgrids","family":"microgrid-topology","input":"Switching-state transitions","output":"Topology change event"},"plainEnglish":{"title":"What this block does","introduction":"Reports confirmed connectivity changes to the assigned control and event-recording systems.","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 “Switching-state transitions” at the input and “circuit arrangement change event” at the output. Transition quality and time reference need identification.","drawings":"Start at the named input: Switching-state transitions. Identify its source device or document and the state represented on the drawing. Follow the named output: circuit arrangement change event. Cross-reference its destination and separate the command from confirmation that the equipment responded.","terms":[{"name":"Input","meaning":"Switching-state transitions"},{"name":"Output","meaning":"Topology change event"},{"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":["Switching-state transitions","MTCEI","Topology change event"],"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-change-event-interface","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/microgrid-topology-change-event-interface.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."}]}