P/I
Active-power transducer
Measuring transducer that converts CT and VT inputs into a DC signal proportional to active power for SCADA or control.
Schematic / SLD
Symbols · U/I
Voltage measuring transducer
Transducer that converts a VT secondary or direct voltage into an isolated analogue signal for remote measurement.
In plain English
What does Voltage measuring transducer mean?
A voltage measuring device that turns a measured quantity into a signal converts a voltage into a standard analogue signal such as 4-20 mA, with electrical separation without a direct conducting path between input and output. It is fed from a VT secondary or, at low voltage, directly from the busbar through fuses, and it supplies a PLC, SCADA or regulator input.
A simple example
The symbol does not show whether the output follows RMS or average value, or the live zero of the output range. If the device that turns a measured quantity into a signal is self-powered from the measured voltage, its output fails when the voltage collapses, which matters when it is used to detect loss of supply.
What the drawings help you do
Check whether the device that turns a measured quantity into a signal has a separate auxiliary supply. Confirm the output range and live zero. A voltage device that turns a measured quantity into a signal provides a signal to other equipment; a voltmeter displays the reading locally.
This particular reference
device that turns a measured quantity into a signal that converts a VT secondary or direct voltage into an isolated analogue signal for remote measurement. A voltage device that turns a measured quantity into a signal provides a signal to other equipment; a voltmeter displays the reading locally.
- Signal
- Electrical information passed between devices, rather than necessarily the main power supply.
- Rating
- A value stating the conditions for which equipment is specified.
- Schematic
- A drawing showing function and connections rather than physical appearance.
Read the source: Analog current signal isolation · IEC graphical symbols for diagrams
Schematic · U/I
What it represents
A voltage measuring transducer converts a voltage into a standard analogue signal such as 4-20 mA, with galvanic isolation between input and output. It is fed from a VT secondary or, at low voltage, directly from the busbar through fuses, and it supplies a PLC, SCADA or regulator input.
The symbol does not show whether the output follows RMS or average value, or the live zero of the output range. If the transducer is self-powered from the measured voltage, its output fails when the voltage collapses, which matters when it is used to detect loss of supply.
How to read it
- Check whether the transducer has a separate auxiliary supply.
- Confirm the output range and live zero.
Information to show or reference
- Show input fusing
- State input and output ranges
- Reference receiving input
A distinction that matters
A voltage transducer provides a signal to other equipment; a voltmeter displays the reading locally.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Analog current signal isolation
Public context for isolated analogue measuring signals.
IEC graphical symbols for diagrams
IEC context for graphical symbols used in diagrams; no IEC graphic is reproduced.
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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