GEN
Generator
An electrical generating source represented in a power-system drawing.
SLD / Schematic
Protection functions · 12
Overspeed device
Responds when machine speed exceeds the documented operating criterion.
SLD / Schematic · 12
What it represents
Responds when machine speed exceeds the documented operating criterion.
In a drafting package, connect this reference to the speed sensor and shaft or machine identity. The associated drawing should trace the overspeed shutdown or alarm path; the number identifies the role and does not specify the terminal arrangement, ratings or operating settings.
How to read it
- Identify the speed sensor and shaft or machine identity.
- Trace the overspeed shutdown or alarm path.
Information to show or reference
- Label the speed sensor and shaft or machine identity.
- Cross-reference the overspeed shutdown or alarm path.
- Identify the device tag, manual revision and logic drawing that define this implementation.
A distinction that matters
Electrical frequency can relate to speed, but an 81 element is not universally equivalent to mechanical overspeed protection.
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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