CT
Current transformer
A current-measurement transformer used with metering and protection equipment.
SLD / Schematic
Symbols · Hz
Frequency meter
A frequency meter indicates the frequency of its measured input.
SLD / Schematic · Hz
What it represents
A frequency meter indicates the frequency of its measured input. The source of that input must be clear when multiple buses or generators are present.
How to read it
- Trace the measurement to the correct bus or VT circuit.
- 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
- Name measured source
- State input range
- Reference auxiliary supply
A distinction that matters
A frequency meter displays a quantity; an underfrequency relay applies an operating threshold.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
AutoCAD Electrical: Instrumentation and sensors
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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