Procedures for demonstrating the adequacy of new Class 1E transformers, located in a mild environment of a nuclear power generating station, to perform their required safety functions under postulated service conditions are presented. Single- and three-phase transformers rated 601 V to 15,000 V for the highest voltage winding and up to 2500 kVA (self-cooled rating) are covered. Because of the conservative approach used in the development of this standard for new transformers, the end-point criteria cannot be used for in-service transformers.
- Sponsor Committee
- PE/TR - Transformers
Learn More - Status
- Superseded Standard
- Superseded by
- 638-1994
- Board Approval
- 1992-03-19
- History
-
- ANSI Approved:
- 1999-07-21
- Published:
- 1992-06-22
- Reaffirmed:
- 2006-03-30
Additional Resources
- Erratas
- 638-1992_errata.pdf
Working Group Details
- Society
- IEEE Power and Energy Society
Learn More - Sponsor Committee
- PE/TR - Transformers
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