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Synchronism check
Checks documented synchronising conditions before a permitted connection.
Protection functions
Functional block · MSPB
Microgrid synchronising phase-error block
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
Calculates the defined phase-angle difference between the two assigned voltage references.
A simple example
In a microgrid reconnecting at its point of common coupling, a synchroniser can adjust the island reference while a separate permissive confirms the permitted relationship across the open breaker. For this reference, the drawing identifies “Two voltage phase references” at the input and “Synchronising phase error” at the output. Phase sequence and transformer displacement affect interpretation.
What the drawings help you do
Start at the named input: Two voltage phase references. Identify its source device or document and the state represented on the drawing. Follow the named output: Synchronising phase error. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- Input
- Two voltage phase references
- Output
- Synchronising phase error
- 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 Flex components and control design
Schematic · MSPB
What it represents
Calculates the defined phase-angle difference between the two assigned voltage references. Synchronising control compares two AC systems before their assigned connecting breaker closes. Voltage magnitude, frequency, phase relationship, breaker readiness and command authority are separate inputs to the closing decision.
In a microgrid reconnecting at its point of common coupling, a synchroniser can adjust the island reference while a separate permissive confirms the permitted relationship across the open breaker. For this reference, the drawing identifies “Two voltage phase references” at the input and “Synchronising phase error” at the output. Phase sequence and transformer displacement affect interpretation.
Identify the two measurement sides and the equipment receiving any adjustment request. Closing limits, breaker timing and loss-of-measurement behavior require the approved synchronising design. 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: Two voltage phase references. Identify its source device or document and the state represented on the drawing.
- Follow the named output: Synchronising phase error. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- Phase sequence and transformer displacement affect interpretation.
- Identify the two measurement sides and the equipment receiving any adjustment request. Closing limits, breaker timing and loss-of-measurement behavior require the approved synchronising design.
Information to show or reference
- Label the source and connection reference for two voltage phase references.
- Identify the destination and defined state of synchronising phase error.
- Record the equipment or control-document revision supporting this functional block.
- Check this application limit in the project design: Phase sequence and transformer displacement affect interpretation.
A distinction that matters
Phase sequence and transformer displacement affect interpretation. 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 Flex components and control design
Public technical context for microgrid synchronising interfaces. Microgrid power and control interfaces, synchronisation and source coordination. 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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