GEN
Generator
An electrical generating source represented in a power-system drawing.
SLD / Schematic
Protection functions · 40
Field or loss-of-excitation protection
Detects an abnormal machine excitation condition using the implementation's field or electrical measurements.
SLD / Schematic · 40
What it represents
Detects an abnormal machine excitation condition using the implementation's field or electrical measurements.
In a drafting package, connect this reference to the machine measurements and excitation reference. The associated drawing should trace the excitation alarm or generator trip path; the number identifies the role and does not specify the terminal arrangement, ratings or operating settings.
How to read it
- Identify the machine measurements and excitation reference.
- Trace the excitation alarm or generator trip path.
Information to show or reference
- Label the machine measurements and excitation reference.
- Cross-reference the excitation alarm or generator trip path.
- Identify the device tag, manual revision and logic drawing that define this implementation.
A distinction that matters
Loss-of-excitation protection supervises a condition; device 41 switches the field circuit.
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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