*
Integrating instrument general symbol
General rectangle-with-band form for instruments that totalise a quantity over time, such as energy meters.
SLD / Schematic
Symbols · V²h
Volt-squared-hour meter
Integrating meter that totalises the square of voltage over time, used to assess voltage-dependent losses and stress.
In plain English
What does Volt-squared-hour meter mean?
A volt-squared-hour meter integrates the square of voltage over time. Quantities such as iron losses in transformers and the stress on some insulation vary roughly with voltage squared, so the register gives a measure of exposure that a simple time-at-voltage record would not.
A simple example
It is uncommon on modern drawings and is often provided as a calculated register inside a multifunction meter. The symbol does not tell you the reference voltage or whether the value is per phase or combined, so the meter documentation is needed to use the reading.
What the drawings help you do
Check whether the value is per phase or combined. Confirm whether this is a separate meter or a calculated register. A V²h meter integrates voltage squared; a kWh meter integrates power.
This particular reference
Integrating meter that totalises the square of voltage over time, used to assess voltage-dependent losses and stress. A V²h meter integrates voltage squared; a kWh meter integrates power.
- Winding
- A coil of conductor inside an electrical machine or transformer.
- Phase
- One of the related AC waveforms in a power system.
- Rating
- A value stating the conditions for which equipment is specified.
Read the source: IEC graphical symbols for diagrams
Schematic · V²h
What it represents
A volt-squared-hour meter integrates the square of voltage over time. Quantities such as iron losses in transformers and the stress on some insulation vary roughly with voltage squared, so the register gives a measure of exposure that a simple time-at-voltage record would not.
It is uncommon on modern drawings and is often provided as a calculated register inside a multifunction meter. The symbol does not tell you the reference voltage or whether the value is per phase or combined, so the meter documentation is needed to use the reading.
How to read it
- Check whether the value is per phase or combined.
- Confirm whether this is a separate meter or a calculated register.
Information to show or reference
- Show VT source
- State reference voltage
- Reference meter documentation
A distinction that matters
A V²h meter integrates voltage squared; a kWh meter integrates power.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
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
Put the reference into a drawing workflow.
Elora Grid helps electrical teams work with drawings, specifications and equipment information. Explore the drafting workflow or join the early-access waitlist.