{"schemaVersion":1,"slug":"64f-field-ground-fault-protection","name":"Field ground-fault protection","kind":"function","abbreviation":"64F","aliases":["rotor field ground","field earth fault","ANSI 64F","IEEE 64F"],"category":"measurement-protection","drawingTypes":["SLD","Schematic"],"referenceFamilies":["IEEE / ANSI","Manufacturer"],"summary":"Detects an earth fault in a machine field circuit using the selected field-ground detection arrangement.","description":["Detects an earth fault in a machine field circuit using the selected field-ground detection arrangement.","The drafting record should connect this function to the field circuit, injection or sensing equipment and earth reference, then trace the field-ground alarm or trip output. 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 field circuit, injection or sensing equipment and earth reference.","Trace the field-ground alarm or trip output."],"drawingChecklist":["Label the field circuit, injection or sensing equipment and earth reference.","Cross-reference the field-ground alarm or trip output.","Retain the complete suffix, selected device tag and manufacturer manual revision."],"distinction":"Field-ground protection addresses the rotor excitation circuit; stator-ground function 64G addresses a different insulation system.","facts":[{"label":"Function designation","value":"64F"},{"label":"Base function","value":"64 — Ground detector protection"},{"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":["64-ground-detector-protection","current-transformer"],"artwork":"pub-function-box","publishedOn":"2026-10-13","updatedOn":"2026-10-13","provenance":"independent-public-research","url":"https://eloragrid.ai/protection-functions/64f-field-ground-fault-protection","illustration":{"url":"https://eloragrid.ai/library/illustrations/64f-field-ground-fault-protection.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."}]}