CT
Current transformer
A current-measurement transformer used with metering and protection equipment.
SLD / Schematic
Symbols · CT test
CT test terminal
A current-transformer terminal arrangement providing documented test and shorting facilities.
Schematic · CT test
What it represents
A CT test-terminal arrangement connects current-transformer secondary wiring to measurement or protection equipment and provides the test or short-circuit facilities specified for the selected assembly. Its representation must be read with the manufacturer circuit and operating documentation.
Test-disconnect terminals are not all interchangeable. CT applications require the correct shorting behaviour and accessory arrangement. This reference explains what to identify in a drawing, not a procedure for disconnecting or working on a live CT circuit.
How to read it
- Identify each CT secondary path and the associated test or shorting connections.
- Do not infer the operation of a test plug or link from a generic terminal mark.
Information to show or reference
- Reference the exact terminal assembly.
- Identify shorting links and test accessories.
- Cross-reference the CT and connected measurement device.
A distinction that matters
A generic disconnect terminal is not automatically suitable for a CT secondary circuit. Use an arrangement specified for the CT application.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Transformer terminals for measuring and test circuits
Manufacturer CT measuring, testing and leading-short-circuit terminal arrangements.
Disconnect and knife-disconnect terminal blocks
Contrast with generic disconnect-terminal products.
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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