67
Directional overcurrent
An overcurrent function with a documented direction criterion.
Protection functions
Protection functions · 67YN
Multifrequency admittance earth-fault protection
Assesses earth-fault behaviour using the manufacturer's multifrequency admittance-based method.
SLD / Schematic · 67YN
What it represents
Assesses earth-fault behaviour using the manufacturer's multifrequency admittance-based method.
The drafting record should connect this function to the residual current and residual voltage channels and neutral-earthing reference, then trace the admittance earth-fault function and feeder tripping 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 (ABB Relion 620 function mapping). 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 residual current and residual voltage channels and neutral-earthing reference.
- Trace the admittance earth-fault function and feeder tripping output.
Information to show or reference
- Label the residual current and residual voltage channels and neutral-earthing reference.
- Cross-reference the admittance earth-fault function and feeder tripping output.
- Retain the complete suffix, selected device tag and manufacturer manual revision.
A distinction that matters
ABB's 67YN mapping identifies a multifrequency method; it is not simply another pickup stage of 67N.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Relion 620 series: published protection function and designation mappings
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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