# Microgrid resource availability summary

Canonical URL: https://eloragrid.ai/symbols/microgrid-resource-availability-summary
Publisher: Elora Grid
Updated: 2026-11-03
Lookup label: MRAS
Drawing use: Schematic
Reference families: Manufacturer

Representation: Functional block
Installation focus: microgrids
Input: Resource readiness and topology
Output: Site resource availability

Combines the assigned resource readiness states into the defined site availability display.

## In plain English

### What this block does

Combines the assigned resource readiness states into the defined site availability display.

### A simple example

In a microgrid control room, the operator can see source availability, active constraints and current operating mode. A communication failure should remain distinguishable from an electrical resource failure. For this reference, the drawing identifies “Resource readiness and circuit arrangement” at the input and “Site resource availability” at the output. Available resources can have different operating capabilities.

### What the drawings help you do

Start at the named input: Resource readiness and circuit arrangement. Identify its source device or document and the state represented on the drawing. Follow the named output: Site resource availability. Cross-reference its destination and separate the command from confirmation that the equipment responded.

### Terms

- Input: Resource readiness and topology
- Output: Site resource availability
- Application reference: An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections.

Concept diagram: Resource readiness and topology → MRAS → Site resource availability
A reading guide. The entry's original illustration and input/output facts describe this application.

- [Microgrid control systems](https://selinc.com/services/microgrids-power-management/microgrid-control-systems/)


## What it represents

Combines the assigned resource readiness states into the defined site availability display. Microgrid supervision coordinates measurements, control authority and resource communication without replacing local protection. Each resource value needs a named measurement boundary, freshness condition and intended control use.
In a microgrid control room, the operator can see source availability, active constraints and current operating mode. A communication failure should remain distinguishable from an electrical resource failure. For this reference, the drawing identifies “Resource readiness and topology” at the input and “Site resource availability” at the output. Available resources can have different operating capabilities.
Identify signal ownership, quality flags, control priority and loss-of-data behavior. These functional references do not certify cyber security, closed-loop performance or equipment interoperability. 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: Resource readiness and topology. Identify its source device or document and the state represented on the drawing.
- Follow the named output: Site resource availability. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- Available resources can have different operating capabilities.
- Identify signal ownership, quality flags, control priority and loss-of-data behavior. These functional references do not certify cyber security, closed-loop performance or equipment interoperability.

## Information to show or reference

- Label the source and connection reference for resource readiness and topology.
- Identify the destination and defined state of site resource availability.
- Record the equipment or control-document revision supporting this functional block.
- Check this application limit in the project design: Available resources can have different operating capabilities.

## Important distinction

Available resources can have different operating capabilities. 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: Microgrids
- Input / boundary: Resource readiness and topology
- Output / connection: Site resource availability
- Lookup label: MRAS is a library lookup label, not a standard device designation.

## Public references

- [Microgrid control systems](https://selinc.com/services/microgrids-power-management/microgrid-control-systems/) — SEL. Public technical context for microgrid supervisory and communication interfaces. Active and reactive power, generation, load control, operating reserves and system supervision. 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.