# Microgrid restoration stabilization hold

Canonical URL: https://eloragrid.ai/symbols/microgrid-restoration-stabilization-hold
Publisher: Elora Grid
Updated: 2026-11-03
Lookup label: MRSH
Drawing use: Schematic
Reference families: Manufacturer

Representation: Functional block
Installation focus: microgrids
Input: Stage measurements and timing
Output: Stage progression restraint

Maintains the defined stage while its specified electrical stabilization conditions are assessed.

## In plain English

### What this block does

Maintains the defined stage while its specified electrical stabilization conditions are assessed.

### A simple example

In a microgrid recovering from a blackout, an available grid-forming source can establish the assigned island reference before compatible generation and eligible load groups are introduced under the validated restoration strategy. For this reference, the drawing identifies “Stage measurements and timing” at the input and “Stage progression restraint” at the output. A time delay alone does not establish stability.

### What the drawings help you do

Start at the named input: Stage measurements and timing. Identify its source device or document and the state represented on the drawing. Follow the named output: Stage progression restraint. Cross-reference its destination and separate the command from confirmation that the equipment responded.

### Terms

- Input: Stage measurements and timing
- Output: Stage progression restraint
- Application reference: An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections.

Concept diagram: Stage measurements and timing → MRSH → Stage progression restraint
A reading guide. The entry's original illustration and input/output facts describe this application.

- [Avista Shared Energy Economy microgrid protection and control case study](https://selinc.com/api/download/135486/)


## What it represents

Maintains the defined stage while its specified electrical stabilization conditions are assessed. Black-start and restoration control coordinates the establishment of an electrical reference and the gradual return of assigned resources and loads. A dead system, an available starting source and a successful load restoration are distinct states.
In a microgrid recovering from a blackout, an available grid-forming source can establish the assigned island reference before compatible generation and eligible load groups are introduced under the validated restoration strategy. For this reference, the drawing identifies “Stage measurements and timing” at the input and “Stage progression restraint” at the output. A time delay alone does not establish stability.
Show the prerequisites and confirmation at each control boundary. These original explanatory blocks are not an operating procedure; energization, protection, transformer inrush and motor reacceleration require system-level validation. 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: Stage measurements and timing. Identify its source device or document and the state represented on the drawing.
- Follow the named output: Stage progression restraint. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- A time delay alone does not establish stability.
- Show the prerequisites and confirmation at each control boundary. These original explanatory blocks are not an operating procedure; energization, protection, transformer inrush and motor reacceleration require system-level validation.

## Information to show or reference

- Label the source and connection reference for stage measurements and timing.
- Identify the destination and defined state of stage progression restraint.
- Record the equipment or control-document revision supporting this functional block.
- Check this application limit in the project design: A time delay alone does not establish stability.

## Important distinction

A time delay alone does not establish stability. 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: Stage measurements and timing
- Output / connection: Stage progression restraint
- Lookup label: MRSH is a library lookup label, not a standard device designation.

## Public references

- [Avista Shared Energy Economy microgrid protection and control case study](https://selinc.com/api/download/135486/) — SEL. Public technical context for microgrid black-start and restoration controls. Storage, protection, black start, load restoration and coordinated island operation. 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.