IEEE 421-1972
- IEEE Standard Criteria and Definitions for Excitation Systems for Synchronous Machines
- standard by IEEE, 12/08/1972
- Category: IEEE
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- Superseded.This document presents criteria, essential elements, and new and revised definitions forexcitation systems as applied to electric utility synchronous machines with particular emphasisgiven to the application of solid-state devices and to terminology common to feedback controlsystems.
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