MGMC
Microgrid grid-connected mode coordinator
Coordinates the defined source and load controls while the utility interconnection is established.
Functional block
Electrical symbols.
Explore electrical symbols, functional blocks and circuit arrangements for switchgear, switchrooms, substations, switchyards and microgrids. Detailed explanations, drawing notes, public sources and original SVG/DXF illustrations.
Microgrids
MIRI
Microgrid intentional-island request interface
Receives the authorized request to prepare the defined microgrid for separation from the utility.
Functional block
MURC
Microgrid unintentional-island response coordinator
Applies the documented control response to an externally initiated loss of utility connection.
Functional block
MIMC
Microgrid islanded mode coordinator
Coordinates the defined local voltage, frequency and resource controls after the island state is established.
Functional block
MRPB
Microgrid reconnect preparation block
Checks the defined prerequisites before attempting the selected return to grid connection.
Functional block
MTI
Microgrid transition-state indication
Reports that the controller is between its defined stable operating modes.
Functional block
MMAS
Microgrid mode-command authority selector
Selects the authorized origin of operating-mode requests according to the control philosophy.
Functional block
MOMA
Microgrid operating-mode mismatch alarm
Detects disagreement between the requested mode and the established topology or resource state.
Functional block
MCMI
Microgrid controller manual-mode interface
Identifies the documented manual control authority and its assigned automatic restraints.
Functional block
MAE
Microgrid automatic-mode enable
Permits the defined automatic coordination when its required authority and health inputs are satisfied.
Functional block
MRA
Microgrid resource-role assignment
Assigns the selected resources to their documented grid-forming or following control roles.
Functional block
MGRS
Microgrid grid-forming reference selection
Selects the available source assigned to establish the island voltage and frequency reference.
Functional block
Showing 12 of 198
Read the drawing, not just the mark
Small details. Different meanings.
Understand symbols, equipment tags and function numbers—and know when a generic object needs a manufacturer drawing.
In plain English
What do electrical symbols tell you?
Electrical symbols are shorthand for equipment, functions and connections. They let you follow how a circuit works without drawing every physical detail.
A simple example
On a microgrid single-line diagram, a current-transformer symbol marks a measurement point and a breaker symbol marks where a circuit can be disconnected. Their labels identify the actual equipment.
What the drawings help you do
Follow the connected lines to trace power or control signals. Use the project legend to interpret symbols and the selected manufacturer's drawings for dimensions and terminal connections.
- Single-line diagram
- A simplified power-system drawing that often uses one line to represent a three-phase circuit.
- Legend
- The key explaining a drawing's symbols and labels.