421.6-2017 - IEEE Recommended Practice for the Specification and Design of Field Discharge Equipment for Synchronous Machines

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This document is intended to serve as basic reference for the specification and design of field discharge circuits for synchronous machines. It is also intended to provide detailed information about field discharge that complements standards “IEEE 421.4.-2004 Guide for Preparation of Excitation System Specification” and includes many aspects of the withdrawn standard “ANSI/IEEE C37.18.1979 Standard Enclosed Field Discharge Circuit Breakers”. This document shows the most employed field discharge circuits and defines the main design criteria and conditions for the main components of field discharge circuit for synchronous machines.

Sponsor Committee	PE/EDPG - Energy Development & Power Generation
Status	Active
Board Approval	2017-03-23
History	Published Date:2017-06-09

Additional Resources Details

PAR	Approved PAR

Working Group Details

Working Group	ESCS - WG 421.6 - Excitation Systems and Controls Subcommittee (ESCS) -WG 421.6
Working Group Chair	Robert Thornton-Jones
Sponsor Committee	PE/EDPG - Energy Development & Power Generation
Society	IEEE Power and Energy Society
IEEE Program Manager	Malia Zaman
Existing Standards	Superseded 421.1-1986 - IEEE Standard Definitions for Excitation Systems for Synchronous Machines Elements and commonly used components in excitation control systems and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.
	Superseded 421.3-1997 - IEEE Standard for High-Potential Test Requirements for Excitation Systems for Synchronous Machines High-potential test voltages for excitation systems used with synchronous machines are established. Test voltages are established based on whether equipment is connected to the exciter power circuit or is electrically isolated from the exciter power circuit.
	Superseded 421.4-2004 - IEEE Guide for the Preparation of Excitation System Specifications This guide is intended to provide to the specification writer the information to prepare a specification for the purchase of an excitation system. This guide is presented in narrative form with descriptions of functions typical of excitation systems. Narrative is provided describing types of excitation systems and information required for sizing the excitation system.
	Active 421.2-2014 - IEEE Guide for Identification, Testing, and Evaluation of the Dynamic Performance of Excitation Control Systems This guide includes criteria, definitions, and test procedures for evaluating the dynamic performance of excitation control systems for synchronous machines as applied by electric utilities.