# Multifrequency admittance earth-fault protection

Canonical URL: https://eloragrid.ai/protection-functions/67yn-multifrequency-admittance-earth-fault-protection
Publisher: Elora Grid
Updated: 2026-10-13
Lookup label: 67YN
Drawing use: SLD, Schematic
Reference families: IEEE / ANSI, Manufacturer

Assesses earth-fault behaviour using the manufacturer's multifrequency admittance-based method.

## 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.

## Important distinction

ABB's 67YN mapping identifies a multifrequency method; it is not simply another pickup stage of 67N.

## Facts

- Function designation: 67YN
- Base function: 67 — Directional overcurrent
- Published mapping: ABB Relion 620 function mapping
- Suffix scope: Application or manufacturer specific; check the complete drawing legend and selected device manual.

## Public references

- [Relion 620 series: published protection function and designation mappings](https://techdoc.relays.protection-control.abb/r/620-series-IEC-60870-5-103-Point-List-Manual/2.0-FP1-IEC/en-US/Functions-codes-and-symbols) — ABB. 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](https://ieeexplore.ieee.org/document/9984140) — IEEE. Device-number and suffix convention. This page is not a reproduction of the full licensed standard.

## Graphic scope

Independent original educational concept illustration by Elora Grid. Not a certified standards graphic or manufacturer footprint. Unitless; not to scale. Original artwork licence: https://creativecommons.org/licenses/by/4.0/. Publisher material is linked only.