{"schemaVersion":1,"slug":"microgrid-noncritical-load-restoration-request","name":"Microgrid noncritical-load restoration request","kind":"symbol","abbreviation":"MNRR","aliases":["Microgrid black-start and restoration controls","microgrids Microgrid black-start and restoration controls","microgrids","Microgrids","Restoration margin and group eligibility","Noncritical-load reconnect request"],"category":"microgrid-systems","drawingTypes":["Schematic"],"referenceFamilies":["Manufacturer"],"summary":"Requests a lower-priority load group when the documented resource margin is available.","description":["Requests a lower-priority load group when the documented resource margin is available. Black-start and restoration control coordinates the establishment of an electrical reference and the gradual return of assigned resources and loads. A dead system, an available starting source and a successful load restoration are distinct states.","In a microgrid recovering from a blackout, an available grid-forming source can establish the assigned island reference before compatible generation and eligible load groups are introduced under the validated restoration strategy. For this reference, the drawing identifies “Restoration margin and group eligibility” at the input and “Noncritical-load reconnect request” at the output. Priority and power demand need current information.","Show the prerequisites and confirmation at each control boundary. These original explanatory blocks are not an operating procedure; energization, protection, transformer inrush and motor reacceleration require system-level validation. 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: Restoration margin and group eligibility. Identify its source device or document and the state represented on the drawing.","Follow the named output: Noncritical-load reconnect request. Cross-reference its destination and separate the command from confirmation that the equipment responded.","Priority and power demand need current information.","Show the prerequisites and confirmation at each control boundary. These original explanatory blocks are not an operating procedure; energization, protection, transformer inrush and motor reacceleration require system-level validation."],"drawingChecklist":["Label the source and connection reference for restoration margin and group eligibility.","Identify the destination and defined state of noncritical-load reconnect request.","Record the equipment or control-document revision supporting this functional block.","Check this application limit in the project design: Priority and power demand need current information."],"distinction":"Priority and power demand need current information. 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":"Restoration margin and group eligibility"},{"label":"Output / connection","value":"Noncritical-load reconnect request"},{"label":"Lookup label","value":"MNRR is a library lookup label, not a standard device designation."}],"references":[{"sourceId":"pi26-mg-study","relevance":"Public technical context for microgrid black-start and restoration controls. Storage, protection, black start, load restoration and coordinated island operation. The application text and educational graphic are independently authored; the publisher does not certify this representation."}],"related":["grid-forming-inverter","microgrid-controller","microgrid-restoration-stage-complete-feedback"],"artwork":"pi26-microgrid-noncritical-load-restoration-request","publishedOn":"2026-11-03","updatedOn":"2026-11-03","provenance":"independent-public-research","representation":{"type":"functional-block","focus":"microgrids","family":"microgrid-restoration","input":"Restoration margin and group eligibility","output":"Noncritical-load reconnect request"},"plainEnglish":{"title":"What this block does","introduction":"Requests a lower-priority load group when the documented resource margin is available.","example":"In a microgrid recovering from a blackout, an available grid-forming source can establish the assigned island reference before compatible generation and eligible load groups are introduced under the validated restoration strategy. For this reference, the drawing identifies “Restoration margin and group eligibility” at the input and “Noncritical-load reconnect request” at the output. Priority and power demand need current information.","drawings":"Start at the named input: Restoration margin and group eligibility. Identify its source device or document and the state represented on the drawing. Follow the named output: Noncritical-load reconnect request. Cross-reference its destination and separate the command from confirmation that the equipment responded.","terms":[{"name":"Input","meaning":"Restoration margin and group eligibility"},{"name":"Output","meaning":"Noncritical-load reconnect request"},{"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":["Restoration margin and group eligibility","MNRR","Noncritical-load reconnect request"],"caption":"A reading guide. The entry's original illustration and input/output facts describe this application.","sources":[{"label":"Avista Shared Energy Economy microgrid protection and control case study","url":"https://selinc.com/api/download/135486/"}],"profileId":"power-installation-microgrid-restoration"},"url":"https://eloragrid.ai/symbols/microgrid-noncritical-load-restoration-request","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/microgrid-noncritical-load-restoration-request.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-study","publisher":"SEL","title":"Avista Shared Energy Economy microgrid protection and control case study","url":"https://selinc.com/api/download/135486/","scope":"Storage, protection, black start, load restoration and coordinated island operation.","type":"manufacturer","checkedOn":"2026-11-03","reuse":"link-only","relevance":"Public technical context for microgrid black-start and restoration controls. Storage, protection, black start, load restoration and coordinated island operation. The application text and educational graphic are independently authored; the publisher does not certify this representation."}]}