67
Directional overcurrent
An overcurrent function with a documented direction criterion.
Protection functions
Protection functions · 67X
Measured ground directional overcurrent
Applies directional supervision to the separately measured ground or neutral current element in the cited Eaton family.
SLD / Schematic · 67X
What it represents
Applies directional supervision to the separately measured ground or neutral current element in the cited Eaton family.
The drafting record should connect this function to the dedicated ground/neutral CT input and polarising references, then trace the measured directional 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.
How to read it
- Identify the dedicated ground/neutral CT input and polarising references.
- Trace the measured directional earth-fault trip.
Information to show or reference
- Label the dedicated ground/neutral CT input and polarising references.
- Cross-reference the measured directional earth-fault trip.
- Retain the complete suffix, selected device tag and manufacturer manual revision.
A distinction that matters
The X suffix has a product-specific measured-input meaning here; retain the relay manual reference rather than assuming a universal suffix rule.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
EGR-5000 generator protection: public function overview
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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