MGC
Microgrid controller
The supervisory controller that dispatches sources, storage and loads and manages islanding and reconnection of a microgrid.
SLD / Schematic
Functional block · MCEI
Microgrid common-alarm external interface
Functional block · Microgrids
An independently authored application reference. The drawing shows the named function or circuit relationship; use the project legend and selected equipment documentation for its drafting form and connections.
Browse this installation focusIn plain English
What this block does
Provides the defined alarm summary to an external supervisory system while preserving local detail.
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 “Assigned microgrid alarm group” at the input and “External common-alarm output” at the output. A summary alarm is not a diagnosis.
What the drawings help you do
Start at the named input: Assigned microgrid alarm group. Identify its source device or document and the state represented on the drawing. Follow the named output: External common-alarm output. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- Input
- Assigned microgrid alarm group
- Output
- External common-alarm output
- Application reference
- An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections.
Read the source: Microgrid control systems
Schematic · MCEI
What it represents
Provides the defined alarm summary to an external supervisory system while preserving local detail. 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 “Assigned microgrid alarm group” at the input and “External common-alarm output” at the output. A summary alarm is not a diagnosis.
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: Assigned microgrid alarm group. Identify its source device or document and the state represented on the drawing.
- Follow the named output: External common-alarm output. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- A summary alarm is not a diagnosis.
- 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 assigned microgrid alarm group.
- Identify the destination and defined state of external common-alarm output.
- Record the equipment or control-document revision supporting this functional block.
- Check this application limit in the project design: A summary alarm is not a diagnosis.
A distinction that matters
A summary alarm is not a diagnosis. 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.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Microgrid control systems
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.
About this graphic
This illustration was authored independently by Elora Grid to explain the concept. It is not reproduced from a customer drawing, an official standard graphic or a manufacturer CAD file. Its correspondence to an exact IEC or IEEE symbol identifier has not been certified.
SVG and DXF downloads contain this original artwork. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.
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