{"schemaVersion":1,"slug":"90-regulating-device","name":"Regulating device","kind":"function","abbreviation":"90","aliases":["voltage regulator","automatic voltage regulator","AVR","ANSI 90","IEEE device 90"],"category":"measurement-protection","drawingTypes":["SLD","Schematic"],"referenceFamilies":["IEEE / ANSI"],"summary":"Adjusts equipment to maintain the controlled electrical or operating quantity.","description":["Adjusts equipment to maintain the controlled electrical or operating quantity.","In a drafting package, connect this reference to the reference value, feedback measurement and control mode. The associated drawing should trace the regulating actuator, excitation or tap-changing interface; the number identifies the role and does not specify the terminal arrangement, ratings or operating settings."],"readingNotes":["Identify the reference value, feedback measurement and control mode.","Trace the regulating actuator, excitation or tap-changing interface."],"drawingChecklist":["Label the reference value, feedback measurement and control mode.","Cross-reference the regulating actuator, excitation or tap-changing interface.","Identify the device tag, manual revision and logic drawing that define this implementation."],"distinction":"Device 90 is a general regulating role; identify whether this instance controls voltage, taps or another quantity.","facts":[{"label":"ANSI / IEEE function number","value":"90"},{"label":"Drawing context","value":"The reference value, feedback measurement and control mode"},{"label":"Application scope","value":"Protection or apparatus-control role; exact implementation is defined by the equipment documentation."}],"references":[{"sourceId":"pub-function-sel-numbers","relevance":"Public manufacturer number/name association. Drafting explanations are independently written."},{"sourceId":"ieee-functions","relevance":"Normative device-number publication; exact edition wording and compliance require the licensed standard."}],"related":["power-transformer","52-ac-circuit-breaker"],"artwork":"pub-function-box","publishedOn":"2026-10-13","updatedOn":"2026-10-13","provenance":"independent-public-research","url":"https://eloragrid.ai/protection-functions/90-regulating-device","illustration":{"url":"https://eloragrid.ai/library/illustrations/90-regulating-device.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"pub-function-sel-numbers","title":"ANSI device-number and suffix reference table","publisher":"Schweitzer Engineering Laboratories","url":"https://selinc.com/pt/products/tables/ansi/","type":"manufacturer","scope":"Public Portuguese-language base-number and application-suffix table. Used to cross-check public number associations. Application-specific and historical labels need the selected drawing legend; this table is not a substitute for the licensed IEEE standard.","checkedOn":"2026-10-13","reuse":"link-only","relevance":"Public manufacturer number/name association. Drafting explanations are independently written."},{"id":"ieee-functions","title":"IEEE C37.2-2022: power-system device function numbers","publisher":"IEEE","url":"https://ieeexplore.ieee.org/document/9984140","type":"standard","scope":"Device function numbers, acronyms and contact designations. The full publication may require access through IEEE.","checkedOn":"2026-10-13","reuse":"link-only","relevance":"Normative device-number publication; exact edition wording and compliance require the licensed standard."}]}