IEEE 421.1:1986 (R1996)

Revision Standard - Superseded.
Elements and commonly used components in excitation control systems and for excitation systems as applied to synchronous machines are defined. The primary purpose of the standard is to provide a vocabulary for writing excitation systems specifications, evaluating excitation system performance, specifying methods for excitation system tests, and preparing excitation system standards. It is also intended to serve as an educational aid for those becoming acquainted with excitation systems.

This standard defines elements and commonly used components in excitation control systems and contains definitions for excitation systems as applied to synchronous machines. The primary purpose is to provide a vocabulary for 1) Writing excitation systems specifications
2) Evaluating excitation system performance
3) Specifying methods for excitation system tests
4) Preparing excitation system standards
5) Serving as an educational means for those becoming acquainted with excitation systems