{"schemaVersion":1,"slug":"67g-directional-ground-overcurrent","name":"Directional ground-overcurrent","kind":"function","abbreviation":"67G","aliases":["directional earth overcurrent","ground directional element","ANSI 67G","IEEE 67G"],"category":"measurement-protection","drawingTypes":["SLD","Schematic"],"referenceFamilies":["IEEE / ANSI","Manufacturer"],"summary":"Supervises a ground-current quantity with direction determined by the selected relay's polarising method.","description":["Supervises a ground-current quantity with direction determined by the selected relay's polarising method.","The drafting record should connect this function to the ground-current input and voltage/current polarising references, then trace the ground directional element and breaker 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 (SEL generator protection feature table). Suffixes are not universal equivalences across products, and this reference supplies neither a protection setting nor certification of the selected scheme."],"readingNotes":["Identify the ground-current input and voltage/current polarising references.","Trace the ground directional element and breaker trip."],"drawingChecklist":["Label the ground-current input and voltage/current polarising references.","Cross-reference the ground directional element and breaker trip.","Retain the complete suffix, selected device tag and manufacturer manual revision."],"distinction":"Ground and neutral suffixes may identify different inputs; the selected relay's mapping decides how G differs from N.","facts":[{"label":"Function designation","value":"67G"},{"label":"Base function","value":"67 — Directional overcurrent"},{"label":"Published mapping","value":"SEL generator protection feature table"},{"label":"Suffix scope","value":"Application or manufacturer specific; check the complete drawing legend and selected device manual."}],"references":[{"sourceId":"pub-function-sel-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/67g-directional-ground-overcurrent","illustration":{"url":"https://eloragrid.ai/library/illustrations/67g-directional-ground-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-sel-generator","title":"Generator protection feature and function comparison","publisher":"Schweitzer Engineering Laboratories","url":"https://selinc.com/products/comparisons/generator-protection/","type":"manufacturer","scope":"Public mappings for generator functions, including phase distance, field/stator ground, thermal RTD, sequence-current and vector-shift applications. Product availability depends on model/options; no settings are provided here.","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."}]}