TX
Power transformer
Equipment transferring electrical power between winding circuits.
SLD / Schematic
Symbols · AT 1PH
Single-phase autotransformer
A single-phase autotransformer uses a winding portion shared electrically by its input and output circuits.
SLD / Schematic · AT 1PH
What it represents
A single-phase autotransformer uses a winding portion shared electrically by its input and output circuits. Its drawing must make the common connection clear because it does not provide winding separation like a two-winding transformer.
How to read it
- Trace the common winding terminal and identify the supply and load tap positions.
- The preview is an original explanation of this function. Match the actual drawing convention to its legend and the selected equipment documentation.
Information to show or reference
- State input and output voltages
- Show common winding connection
- Reference tap and rating data
A distinction that matters
An autotransformer is not an isolating two-winding transformer.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Power, potential and autotransformer symbols
Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source graphic.
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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