U/I
Voltage measuring transducer
Transducer that converts a VT secondary or direct voltage into an isolated analogue signal for remote measurement.
Schematic
Symbols · 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.
In plain English
What does Active-power transducer mean?
An active-power device that turns a measured quantity into a signal takes current and voltage inputs and produces a DC current or voltage signal proportional to watts, often bipolar so that export and import give opposite signs. It is used where a governor, load controller or older SCADA needs an analogue power signal.
A simple example
The output range, including how negative power is represented, must match the receiving input. The symbol shows the conversion but not the element configuration, response time or the scaling between rated power and output signal.
What the drawings help you do
Check how reverse power is represented at the output. Confirm element configuration matches the system wiring. An active-power device that turns a measured quantity into a signal outputs a signal; an active power indicator displays the value.
This particular reference
Measuring device that turns a measured quantity into a signal that converts CT and VT inputs into a DC signal proportional to active power for SCADA or control. An active-power device that turns a measured quantity into a signal outputs a signal; an active power indicator displays the value.
- DC
- Direct current: electricity flowing in one direction.
- Signal
- Electrical information passed between devices, rather than necessarily the main power supply.
- Rating
- A value stating the conditions for which equipment is specified.
Read the source: Analog current signal isolation · IEC graphical symbols for diagrams
Schematic / SLD · P/I
What it represents
An active-power transducer takes current and voltage inputs and produces a DC current or voltage signal proportional to watts, often bipolar so that export and import give opposite signs. It is used where a governor, load controller or older SCADA needs an analogue power signal.
The output range, including how negative power is represented, must match the receiving input. The symbol shows the conversion but not the element configuration, response time or the scaling between rated power and output signal.
How to read it
- Check how reverse power is represented at the output.
- Confirm element configuration matches the system wiring.
Information to show or reference
- State full-scale power
- State output range
- Show CT and VT inputs
A distinction that matters
An active-power transducer outputs a signal; an active power indicator displays the value.
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 analogue measuring signals and their isolation.
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.
Explore related references
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Active-power indicator
An active-power indicator displays real power derived from its specified measurement inputs.
SLD / Schematic
ISO I-I
Analog current signal isolator
A current signal isolator transfers a documented analog current input to an output while providing the specified electrical separation.
SLD / Schematic
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