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

PQM

GA objects

Power quality meter

A power quality meter measures electrical quantities and provides the power-quality monitoring functions documented for its model. Examples include waveform or disturbance recording and analysis of abnormal supply conditions. An ordinary energy meter should not be assumed to provide these functions.

Drawing use: GA / SLD / Schematic
Application: Metering & protection
Reference family: Manufacturer

A distinction that matters

Power-quality monitoring and energy registration overlap in some meters. A meter label or network connection alone does not prove the event capture, accuracy class or recording capabilities needed for a particular study.

Full reference

Symbols

Current transformer

A current transformer produces a secondary current related to the current in its primary conductor. A drawing uses the CT representation to show where current is measured and which metering or protection circuit receives that measurement. It does not, by itself, specify the CT ratio, accuracy class, burden or secondary connection.

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

A distinction that matters

A CT measures current. A VT measures voltage. Their secondary circuits and isolation/testing arrangements are different.

Full reference

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