# Calculated residual directional overcurrent

Canonical URL: https://eloragrid.ai/protection-functions/67r-calculated-residual-directional-overcurrent
Publisher: Elora Grid
Updated: 2026-10-13
Lookup label: 67R
Drawing use: SLD, Schematic
Reference families: IEEE / ANSI, Manufacturer

Applies directional overcurrent to calculated residual current in the cited Eaton application.

## 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.

## Important distinction

R in this Eaton mapping denotes calculated residual current; its input differs from the separately measured X element.

## Facts

- Function designation: 67R
- Base function: 67 — Directional overcurrent
- Published mapping: Eaton EGR family
- Suffix scope: Application or manufacturer specific; check the complete drawing legend and selected device manual.

## Public references

- [EGR-5000 generator protection: public function overview](https://www.eaton.com/us/en-us/catalog/electrical-circuit-protection/generator-relays.html) — Eaton. 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.