Side-by-side reference

Understand the difference.

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

First referenceCompare with

Symbols

Power transformer

A power-transformer representation identifies equipment transferring electrical power between winding circuits. The generic mark can show the relationship between windings, but voltage levels, winding connections, vector group, rating and earthing information require additional annotations and equipment references.

Drawing use: SLD / Schematic
Application: Power distribution
Reference family: IEC / IEEE / ANSI

A distinction that matters

A transformer used for voltage measurement is a VT or PT. Its function and secondary circuit differ from those of a power transformer.

Full reference

VT / PT

Symbols

Voltage transformer

A voltage transformer provides a secondary voltage related to the voltage on its primary winding. VT and PT, for potential transformer, are common terms encountered in power drawings. Its representation identifies a measurement function; winding connections, fuses, earthing and secondary circuits need their own documented detail.

Drawing use: SLD / Schematic
Application: Metering & protection
Reference family: IEC / IEEE / ANSI

A distinction that matters

A VT supplies a voltage measurement; a power transformer supplies a power circuit. A shared transformer-like outline does not make their functions interchangeable.

Full reference

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