25
Synchronism check
Checks documented synchronising conditions before a permitted connection.
Protection functions
Protection functions · 15
Speed or frequency matching device
Adjusts or supervises the difference between two speed or frequency references.
SLD / Schematic · 15
What it represents
Adjusts or supervises the difference between two speed or frequency references.
In a drafting package, connect this reference to the two references being compared. The associated drawing should trace the governor or matching command; the number identifies the role and does not specify the terminal arrangement, ratings or operating settings.
How to read it
- Identify the two references being compared.
- Trace the governor or matching command.
Information to show or reference
- Label the two references being compared.
- Cross-reference the governor or matching command.
- Identify the device tag, manual revision and logic drawing that define this implementation.
A distinction that matters
Matching speed or frequency is one aspect of synchronisation and does not replace the complete synchronism check.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
ANSI device-number and suffix reference table
Public manufacturer number/name association. Drafting explanations are independently written.
IEEE C37.2-2022: power-system device function numbers
Normative device-number publication; exact edition wording and compliance require the licensed standard.
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. DXF uses unscaled drawing units; a GA envelope supplies no product dimensions, clearances or fabrication information. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.
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