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

WTG T4

Symbols

Full-converter wind turbine generator (Type 4)

In a Type 4 turbine the generator, commonly a permanent-magnet or wound-field synchronous machine and sometimes an induction machine, is fully decoupled from the network by a back-to-back converter rated for the whole turbine output. The machine-side converter rectifies variable-frequency generator output to a DC link and the grid-side converter produces network-frequency AC.

Drawing use: SLD
Application: Microgrid systems
Reference family: IEC / IEEE / ANSI

A distinction that matters

A Type 4 turbine routes all power through the converter; a DFIG routes only rotor slip power through it.

Full reference

G 3PH PM

Symbols

Permanent-magnet synchronous generator

A permanent-magnet synchronous generator provides an AC source using a permanent magnetic excitation system. Any converter between this source and the AC network must be shown separately.

Drawing use: SLD / Schematic
Application: Microgrid systems
Reference family: IEC / Manufacturer

A distinction that matters

Permanent-magnet excitation does not mean direct grid connection is appropriate for every machine.

Full reference

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