# Microgrid energy-accounting measurement boundary

Canonical URL: https://eloragrid.ai/symbols/microgrid-energy-accounting-measurement-boundary
Publisher: Elora Grid
Updated: 2026-11-03
Lookup label: MEMB
Drawing use: Schematic
Reference families: Manufacturer

Representation: Functional block
Installation focus: microgrids
Input: Named energy measurements
Output: Separated energy quantities

Identifies the metering boundary used to distinguish generation, load, import and storage energy.

## In plain English

### What this block does

Identifies the metering boundary used to distinguish generation, load, import and storage energy.

### 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 “Named energy measurements” at the input and “Separated energy quantities” at the output. Metering and control boundaries can differ.

### What the drawings help you do

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

### Terms

- Input: Named energy measurements
- Output: Separated energy quantities
- Application reference: An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections.

Concept diagram: Named energy measurements → MEMB → Separated energy quantities
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

Identifies the metering boundary used to distinguish generation, load, import and storage energy. 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 “Named energy measurements” at the input and “Separated energy quantities” at the output. Metering and control boundaries can differ.
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: Named energy measurements. Identify its source device or document and the state represented on the drawing.
- Follow the named output: Separated energy quantities. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- Metering and control boundaries can differ.
- 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 named energy measurements.
- Identify the destination and defined state of separated energy quantities.
- Record the equipment or control-document revision supporting this functional block.
- Check this application limit in the project design: Metering and control boundaries can differ.

## Important distinction

Metering and control boundaries can differ. 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: Named energy measurements
- Output / connection: Separated energy quantities
- Lookup label: MEMB 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.