Understand the difference.

Compare the meaning, drawing context and source references of two entries. A similar graphic or shared abbreviation does not establish equivalence.

V²h

Symbols

Volt-squared-hour meter

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.

Drawing use

Schematic

Application

Metering & protection

Reference family

IEC

A distinction that matters

A V²h meter integrates voltage squared; a kWh meter integrates power.

Full referenceAdd to legend

*

Symbols

Integrating instrument general symbol

Integrating instruments add up a quantity over time, and IEC-style diagrams draw them as a rectangle with a narrow band across the top. The unit inside, such as kWh, kvarh or Ah, tells the reader what is being totalised, and extra marks in the band can show multi-rate or demand features.

Drawing use

SLD / Schematic

Application

Metering & protection

Reference family

IEC

A distinction that matters

The integrating form totalises; the indicating circle shows an instantaneous value.

Full referenceAdd to legend

Original educational previews. Follow the source references on each full entry for the appropriate standard or selected product.