IEEE P421.6/D4, July 2016
IEEE Draft Recommended Practice for the Specification and Design of Field Discharge Equipment for Synchronous Machines
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About This Item
IEEE P421.6/D4, July 2016 is a draft recommended practice focused on the specification and design of field discharge equipment for synchronous machines. It addresses a specialized part of power and industrial rotating-machine engineering, where controlled field discharge can affect shutdown behavior, protection, and equipment integrity. For engineers, purchasers, and technical reviewers, this standard helps define a clearer basis for design decisions and expected performance in synchronous machine applications.
About IEEE P421.6/D4, July 2016
This draft technical document sets out guidance for field discharge equipment used with synchronous machines, with attention to how the equipment should be specified and designed for reliable operation. IEEE P421.6/D4, July 2016 is relevant to the electrical and mechanical coordination of machine systems, where discharge paths, component ratings, and operating behavior can influence both protection and maintainability. It is intended to support more consistent engineering practice when selecting or evaluating field discharge solutions.
Where is IEEE P421.6/D4, July 2016 used?
IEEE P421.6/D4, July 2016 is commonly associated with synchronous generators and synchronous motors in power generation, industrial drives, and large electrical installations. It is useful wherever field circuits must be discharged in a controlled way after shutdown, fault clearing, or maintenance activity. The document may be applied by designers, equipment suppliers, and plant engineering teams working on machine auxiliaries, protection schemes, and related installation specifications for rotating electrical equipment.
Importance in practice
In practice, this standard matters because field discharge equipment must perform predictably to reduce risk during operation and servicing. Clear guidance helps support compliant design choices, improve consistency between equipment suppliers, and strengthen procurement and testing requirements. IEEE P421.6/D4, July 2016 also helps engineers compare solutions using a common technical basis, which can reduce integration issues and support safer, more dependable synchronous machine installations.
- Field discharge equipment specification
- Synchronous machine design guidance
- Protection and shutdown coordination
- Component rating and performance checks
- Consistent engineering and procurement criteria
- Publication Date: 2016
- Standard Status: Active
- Publisher: IEEE
- Subject: Power, Energy and Industry Applications; Components, Circuits, Devices and Systems
- Official IEEE: Doi link
- New Version Available: P421.6 (2017)
- Previous Version: P421.6 (2016)
- This Version: P421.6 (2016)
- Previous Version: P421.6 (2015)
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