GEN
Generator
An electrical generating source represented in a power-system drawing.
SLD / Schematic
Protection functions · 93
Field-changing contactor
Changes the machine excitation connection or arrangement as part of a controlled field sequence.
SLD / Schematic · 93
What it represents
Changes the machine excitation connection or arrangement as part of a controlled field sequence.
In a drafting package, connect this reference to the field circuits and alternative excitation connections. The associated drawing should trace the field-change coil, contacts and interlocks; the number identifies the role and does not specify the terminal arrangement, ratings or operating settings.
This designation is useful when reading machine and legacy control drawings. Retain the documented function on an existing drawing and consult the original equipment manual before assigning it to a new design.
How to read it
- Identify the field circuits and alternative excitation connections.
- Trace the field-change coil, contacts and interlocks.
Information to show or reference
- Label the field circuits and alternative excitation connections.
- Cross-reference the field-change coil, contacts and interlocks.
- Identify the device tag, manual revision and logic drawing that define this implementation.
A distinction that matters
Field-changing 93 switches an excitation arrangement; field application 56 initiates application of the field.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
SecoGear medium-voltage switchgear application and technical guide, DET-882
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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