64
Ground detector protection
Identifies an earth or ground fault using the circuit arrangement specified for the device.
Protection functions
Protection functions · 64F
Field ground-fault protection
Detects an earth fault in a machine field circuit using the selected field-ground detection arrangement.
SLD / Schematic · 64F
What it represents
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.
How to read it
- Identify the field circuit, injection or sensing equipment and earth reference.
- Trace the field-ground alarm or trip output.
Information to show or reference
- 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.
A distinction that matters
Field-ground protection addresses the rotor excitation circuit; stator-ground function 64G addresses a different insulation system.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Generator protection feature and function comparison
Public primary-source function or application mapping used to identify this designation; wording and drafting notes are original.
IEEE C37.2-2022: power-system device function numbers
Device-number and suffix convention. This page is not a reproduction of the full licensed standard.
About this graphic
This illustration was authored independently by Elora Grid to explain the concept. It is not reproduced from a customer drawing, an official standard graphic or a manufacturer CAD file. Its correspondence to an exact IEC or IEEE symbol identifier has not been certified.
SVG and DXF downloads contain this original artwork. DXF uses unscaled drawing units; a GA envelope supplies no product dimensions, clearances or fabrication information. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.
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