67
Directional overcurrent
An overcurrent function with a documented direction criterion.
Protection functions
Protection functions · 67R
Calculated residual directional overcurrent
Applies directional overcurrent to calculated residual current in the cited Eaton application.
SLD / Schematic · 67R
What it represents
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.
How to read it
- Identify the phase-current inputs and residual polarising reference.
- Trace the calculated residual directional element and earth-fault trip.
Information to show or reference
- 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.
A distinction that matters
R in this Eaton mapping denotes calculated residual current; its input differs from the separately measured X element.
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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