CT
Current transformer
A current-measurement transformer used with metering and protection equipment.
SLD / Schematic
Symbols · CT PRI
Current transformer with primary conductor indication
This CT representation explicitly identifies the primary conductor passing through the measurement location.
SLD / Schematic · CT PRI
What it represents
This CT representation explicitly identifies the primary conductor passing through the measurement location. It helps readers distinguish the power path from the instrument-transformer secondary connections.
How to read it
- Preserve the primary direction and polarity reference where directional protection uses the measurement.
- 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
- Mark primary conductor
- Cross-reference secondary polarity
- Identify connected meter or relay
A distinction that matters
A conductor passing through a CT window is not an electrically connected secondary winding.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Current transformer symbol variants
Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source graphic.
Indoor current and voltage transformers
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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