# Voltage and power directional relay

Canonical URL: https://eloragrid.ai/protection-functions/92-voltage-and-power-directional-relay
Publisher: Elora Grid
Updated: 2026-10-13
Lookup label: 92
Drawing use: SLD, Schematic
Reference families: IEEE / ANSI

Combines voltage and power directional criteria in the specified control or protection arrangement.

## What it represents

Combines voltage and power directional criteria in the specified control or protection arrangement.
In a drafting package, connect this reference to the voltage and current measurement references. The associated drawing should trace the permitted or blocked operating action; the number identifies the role and does not specify the terminal arrangement, ratings or operating settings.
This designation is useful when reading machine and legacy control drawings. Retain the documented function on an existing drawing and consult the original equipment manual before assigning it to a new design.

## How to read it

- Identify the voltage and current measurement references.
- Trace the permitted or blocked operating action.

## Information to show or reference

- Label the voltage and current measurement references.
- Cross-reference the permitted or blocked operating action.
- Identify the device tag, manual revision and logic drawing that define this implementation.

## Important distinction

This specialist combined reference requires a scheme description; it should not replace separate modern function labels without justification.

## Facts

- ANSI / IEEE function number: 92
- Drawing context: The voltage and current measurement references
- Application scope: Specialist or legacy machine-control use; interpret with the equipment legend.

## Public references

- [ANSI device-number and suffix reference table](https://selinc.com/pt/products/tables/ansi/) — Schweitzer Engineering Laboratories. Public manufacturer number/name association. Drafting explanations are independently written.
- [IEEE C37.2-2022: power-system device function numbers](https://ieeexplore.ieee.org/document/9984140) — IEEE. Normative device-number publication; exact edition wording and compliance require the 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.