# GIS pressure-relief operated interface

Canonical URL: https://eloragrid.ai/symbols/gis-pressure-relief-operated-interface
Publisher: Elora Grid
Updated: 2026-11-03
Lookup label: GPOI
Drawing use: Schematic
Reference families: Manufacturer

Representation: Functional block
Installation focus: switchyards
Input: Relief-device operation contact
Output: Compartment relief indication

Receives the assigned compartment pressure-relief device status at station supervision.

## In plain English

### What this block does

Receives the assigned compartment pressure-relief device status at station supervision.

### A simple example

In a switchyard marshalling kiosk, gas compartment, operating mechanism and cabinet-service indications are collected for the station controller. Their equipment tags identify the actual compartment or mechanism being monitored. For this reference, the drawing identifies “Relief-device operation contact” at the input and “Compartment relief indication” at the output. The output does not define an access procedure.

### What the drawings help you do

Start at the named input: Relief-device operation contact. Identify its source device or document and the state represented on the drawing. Follow the named output: Compartment relief indication. Cross-reference its destination and separate the command from confirmation that the equipment responded.

### Terms

- Input: Relief-device operation contact
- Output: Compartment relief indication
- Application reference: An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections.

Concept diagram: Relief-device operation contact → GPOI → Compartment relief indication
A reading guide. The entry's original illustration and input/output facts describe this application.

- [Modular switchgear monitoring](https://www.hitachienergy.com/in/en/products-and-solutions/high-voltage-switchgear-and-breakers/monitoring-and-controlled-switching/modular-switchgear-monitoring-msm)


## What it represents

Receives the assigned compartment pressure-relief device status at station supervision. Yard equipment supervision carries the condition and support-system information of primary equipment into station alarms. A monitor's declared alarm, measurement and self-fault output need separate point names.
In a switchyard marshalling kiosk, gas compartment, operating mechanism and cabinet-service indications are collected for the station controller. Their equipment tags identify the actual compartment or mechanism being monitored. For this reference, the drawing identifies “Relief-device operation contact” at the input and “Compartment relief indication” at the output. The output does not define an access procedure.
Keep primary-device identity, compartment boundaries and monitor health visible. A monitoring illustration does not establish a leak rate, operating threshold or remaining equipment life. The functional block is an independent explanation of this named application. Equipment-specific ratings, terminal connections and operating conditions must be established in the project documentation.

## How to read it

- Start at the named input: Relief-device operation contact. Identify its source device or document and the state represented on the drawing.
- Follow the named output: Compartment relief indication. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- The output does not define an access procedure.
- Keep primary-device identity, compartment boundaries and monitor health visible. A monitoring illustration does not establish a leak rate, operating threshold or remaining equipment life.

## Information to show or reference

- Label the source and connection reference for relief-device operation contact.
- Identify the destination and defined state of compartment relief indication.
- Record the equipment or control-document revision supporting this functional block.
- Check this application limit in the project design: The output does not define an access procedure.

## Important distinction

The output does not define an access procedure. This reference describes the named application; it does not establish a new IEC graphical symbol, an ANSI device-function number or an exact manufacturer connection diagram.

## Facts

- Representation: Functional block
- Installation focus: Switchyards
- Input / boundary: Relief-device operation contact
- Output / connection: Compartment relief indication
- Lookup label: GPOI is a library lookup label, not a standard device designation.

## Public references

- [Modular switchgear monitoring](https://www.hitachienergy.com/in/en/products-and-solutions/high-voltage-switchgear-and-breakers/monitoring-and-controlled-switching/modular-switchgear-monitoring-msm) — Hitachi Energy. Public technical context for switchyard equipment condition interfaces. Gas, operating mechanism and circuit-breaker condition monitoring. The application text and educational graphic are independently authored; the publisher does not certify this representation.

## 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.