{"schemaVersion":1,"slug":"67r-calculated-residual-directional-overcurrent","name":"Calculated residual directional overcurrent","kind":"function","abbreviation":"67R","aliases":["calculated residual directional","calculated ground directional","ANSI 67R","IEEE 67R"],"category":"measurement-protection","drawingTypes":["SLD","Schematic"],"referenceFamilies":["IEEE / ANSI","Manufacturer"],"summary":"Applies directional overcurrent to calculated residual current in the cited Eaton application.","description":["Applies directional overcurrent to calculated residual current in the cited Eaton application.","The drafting record should connect this function to the phase-current inputs and residual polarising reference, then trace the calculated residual directional element and earth-fault trip. Keep the complete designation and equipment tag together so that the SLD, relay logic and terminal schedule describe the same implementation.","The cited mapping is a public manufacturer example (Eaton EGR family). Suffixes are not universal equivalences across products, and this reference supplies neither a protection setting nor certification of the selected scheme."],"readingNotes":["Identify the phase-current inputs and residual polarising reference.","Trace the calculated residual directional element and earth-fault trip."],"drawingChecklist":["Label the phase-current inputs and residual polarising reference.","Cross-reference the calculated residual directional element and earth-fault trip.","Retain the complete suffix, selected device tag and manufacturer manual revision."],"distinction":"R in this Eaton mapping denotes calculated residual current; its input differs from the separately measured X element.","facts":[{"label":"Function designation","value":"67R"},{"label":"Base function","value":"67 — Directional overcurrent"},{"label":"Published mapping","value":"Eaton EGR family"},{"label":"Suffix scope","value":"Application or manufacturer specific; check the complete drawing legend and selected device manual."}],"references":[{"sourceId":"pub-function-eaton-generator","relevance":"Public primary-source function or application mapping used to identify this designation; wording and drafting notes are original."},{"sourceId":"ieee-functions","relevance":"Device-number and suffix convention. This page is not a reproduction of the full licensed standard."}],"related":["67-directional-overcurrent","current-transformer"],"artwork":"pub-function-box","publishedOn":"2026-10-13","updatedOn":"2026-10-13","provenance":"independent-public-research","url":"https://eloragrid.ai/protection-functions/67r-calculated-residual-directional-overcurrent","illustration":{"url":"https://eloragrid.ai/library/illustrations/67r-calculated-residual-directional-overcurrent.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-eaton-generator","title":"EGR-5000 generator protection: public function overview","publisher":"Eaton","url":"https://www.eaton.com/us/en-us/catalog/electrical-circuit-protection/generator-relays.html","type":"manufacturer","scope":"Public generator-relay application reference. Detailed protection function mapping is also published in the E-Series brochure; naming does not establish the selected device configuration.","checkedOn":"2026-10-13","reuse":"link-only","relevance":"Public primary-source function or application mapping used to identify this designation; wording and drafting notes are original."},{"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":"Device-number and suffix convention. This page is not a reproduction of the full licensed standard."}]}