IEEE 421.1-2007
Standard Definitions for Excitation Systems for Synchronous Machines

Standard No.

IEEE 421.1-2007

Release Date

2007

Published By

Institute of Electrical and Electronics Engineers (IEEE)

Status

Be replaced

Replace By

IEEE 421.1-2021

Latest

IEEE 421.1-2021

Scope

This standard defines elements and commonly used components in excitation systems and contains definitions for excitation systems applied to synchronous machines. An included annex contains one-line block diagrams of some typical excitation systems. These are presented to illustrate the defined terminology referenced in this standard and clarify the understanding of the excitation control system.

IEEE 421.1-2007 history

• 1970 IEEE 421.1-2021 IEEE Standard Definitions for Excitation Systems for Synchronous Machines
• 2007 IEEE 421.1-2007 Standard Definitions for Excitation Systems for Synchronous Machines
• 1986 IEEE 421.1-1986 Definitions for excitation systems for synchronous machines