{"schemaVersion":1,"slug":"microgrid-reserve-based-load-shedding","name":"Microgrid reserve-based load shedding","kind":"symbol","abbreviation":"MRLS","aliases":["Microgrid load shedding and restoration","microgrids Microgrid load shedding and restoration","microgrids","Microgrids","Available reserve and requirement","Reserve restoration by shedding"],"category":"microgrid-systems","drawingTypes":["Schematic"],"referenceFamilies":["Manufacturer"],"summary":"Requests load reduction when the defined operating reserve falls below its assigned requirement.","description":["Requests load reduction when the defined operating reserve falls below its assigned requirement. Load management balances the available electrical supply against the loads that remain connected. Shedding, restoration, priority and proof of disconnection are separate control functions and should remain traceable to individual load groups.","In a microgrid island, the controller can disconnect lower-priority loads when a source is lost and later request restoration when the documented reserve and stability conditions permit it. For this reference, the drawing identifies “Available reserve and requirement” at the input and “Reserve restoration by shedding” at the output. Reserve definitions must include resource constraints.","Identify each load group, priority, measured contribution and feedback. Shedding amounts, operating times and restoration conditions require the approved power-management design and the actual connected-load data. 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: Available reserve and requirement. Identify its source device or document and the state represented on the drawing.","Follow the named output: Reserve restoration by shedding. Cross-reference its destination and separate the command from confirmation that the equipment responded.","Reserve definitions must include resource constraints.","Identify each load group, priority, measured contribution and feedback. Shedding amounts, operating times and restoration conditions require the approved power-management design and the actual connected-load data."],"drawingChecklist":["Label the source and connection reference for available reserve and requirement.","Identify the destination and defined state of reserve restoration by shedding.","Record the equipment or control-document revision supporting this functional block.","Check this application limit in the project design: Reserve definitions must include resource constraints."],"distinction":"Reserve definitions must include resource constraints. 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":"Available reserve and requirement"},{"label":"Output / connection","value":"Reserve restoration by shedding"},{"label":"Lookup label","value":"MRLS is a library lookup label, not a standard device designation."}],"references":[{"sourceId":"pi26-mg-study","relevance":"Public technical context for microgrid load shedding and restoration. 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":["microgrid-controller","generic-electrical-load","microgrid-energy-based-load-shedding"],"artwork":"pi26-microgrid-reserve-based-load-shedding","publishedOn":"2026-11-03","updatedOn":"2026-11-03","provenance":"independent-public-research","representation":{"type":"functional-block","focus":"microgrids","family":"microgrid-loads","input":"Available reserve and requirement","output":"Reserve restoration by shedding"},"plainEnglish":{"title":"What this block does","introduction":"Requests load reduction when the defined operating reserve falls below its assigned requirement.","example":"In a microgrid island, the controller can disconnect lower-priority loads when a source is lost and later request restoration when the documented reserve and stability conditions permit it. For this reference, the drawing identifies “Available reserve and requirement” at the input and “Reserve restoration by shedding” at the output. Reserve definitions must include resource constraints.","drawings":"Start at the named input: Available reserve and requirement. Identify its source device or document and the state represented on the drawing. Follow the named output: Reserve restoration by shedding. Cross-reference its destination and separate the command from confirmation that the equipment responded.","terms":[{"name":"Input","meaning":"Available reserve and requirement"},{"name":"Output","meaning":"Reserve restoration by shedding"},{"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":["Available reserve and requirement","MRLS","Reserve restoration by shedding"],"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-loads"},"url":"https://eloragrid.ai/symbols/microgrid-reserve-based-load-shedding","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/microgrid-reserve-based-load-shedding.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 load shedding and restoration. 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."}]}