RC
Rogowski coil current sensor
Air-cored coil around a conductor whose output voltage is proportional to the rate of change of current.
SLD / Schematic
Symbols · RVD
Resistive voltage divider sensor
Low-power voltage sensor using a resistive divider to give a small voltage signal proportional to primary voltage.
In plain English
What does Resistive voltage divider sensor mean?
A resistive voltage divider sensor is a low-power instrument transformer in which a high-value resistor chain steps the primary voltage down to a small signal. It has no iron core, so it does not cause ferroresonance, and one sensor can cover a wide range of primary voltages.
A simple example
The output is a low-energy signal that must go to an input designed for it, and the cable between sensor and relay is part of the measurement. The symbol does not show the division ratio, correction factors or connector type, which must match the relay configuration.
What the drawings help you do
Confirm the relay input is configured for the sensor ratio. Keep the supplied sensor cable unless the manufacturer allows changes. A resistive divider sensor gives a low-level signal; a conventional VT gives a standard secondary voltage capable of supplying burden.
This particular reference
Low-power voltage sensor using a resistive divider to give a small voltage signal proportional to primary voltage. A resistive divider sensor gives a low-level signal; a conventional VT gives a standard secondary voltage capable of supplying burden.
- Winding
- A coil of conductor inside an electrical machine or transformer.
- Normally open / normally closed
- The contact state in the normal condition defined for the drawing.
- Coil
- A wound conductor that can produce a magnetic field when energised.
Read the source: Medium-voltage indoor sensors: Rogowski coil and voltage divider low-power instrument transformers · Indoor current and voltage transformers
SLD / Schematic · RVD
What it represents
A resistive voltage divider sensor is a low-power instrument transformer in which a high-value resistor chain steps the primary voltage down to a small signal. It has no iron core, so it does not cause ferroresonance, and one sensor can cover a wide range of primary voltages.
The output is a low-energy signal that must go to an input designed for it, and the cable between sensor and relay is part of the measurement. The symbol does not show the division ratio, correction factors or connector type, which must match the relay configuration.
How to read it
- Confirm the relay input is configured for the sensor ratio.
- Keep the supplied sensor cable unless the manufacturer allows changes.
Information to show or reference
- State division ratio
- Reference correction factors
- Show connector and cable
A distinction that matters
A resistive divider sensor gives a low-level signal; a conventional VT gives a standard secondary voltage capable of supplying burden.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Medium-voltage indoor sensors: Rogowski coil and voltage divider low-power instrument transformers
Public manufacturer page describing low-power instrument transformers based on Rogowski coils and voltage dividers.
Indoor current and voltage transformers
Public manufacturer overview of indoor current and voltage instrument transformers.
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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