CT
Current transformer
A current-measurement transformer used with metering and protection equipment.
SLD / Schematic
Symbols · I HIGH
Maximum-current monitoring relay
A maximum-current relay changes its output when the measured current meets a configured high-current condition.
SLD / Schematic · I HIGH
What it represents
A maximum-current relay changes its output when the measured current meets a configured high-current condition. Its schematic separates measurement, auxiliary power and relay outputs.
How to read it
- Determine whether the input is direct current, a CT secondary or a conditioned signal.
- 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
- Identify measured input
- Reference threshold and delay
- Show output destination
A distinction that matters
A maximum-current monitoring element is not a complete feeder protection scheme by itself.
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: Current monitoring relays
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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