IEEE 421.1:2007

Revision Standard - Inactive-Reserved.
This standard defines elements and commonly used components in excitation control systems and contains definitions for excitation systems as applied to synchronous machines. These definitions should be useful in the following areas: -- Writing excitation systems specifications -- Evaluating excitation system performance -- Specifying methods for excitation system tests -- Preparing related excitation system standards -- Serving as an educational means for those becoming acquainted with excitation systems -- Modeling excitation systems

This standard provides a common base for terminology in common usage related to excitation control systems. The definitions given in this standard are an adjunct to IEEE Std 100 dictionary in describing terms specifically related to excitation systems. With the advent of new excitation systems and changes in common terminology and usage there are revisions required to keep this standard relevant.