EP 1130-2-510
13 Dec 96
CHAPTER 6 - REWIND OF HYDROELECTRIC GENERATORS AND GENERATOR
MOTORS
6-1. Purpose. This chapter establishes guidance on replacement of generator stator windings,
generators, or other comparable large scale electro-mechanical components of a USACE
hydroelectric power generating facility.
6-2. Background.
a. This guidance is designed to assist hydropower managers in providing higher authority
with a uniform and consistent rationale for replacing a generator or generator/motor winding. It
also provides the framework for justifying the replacement of a generator stator winding as part of
a major rehabilitation program.
b. The goal of this rewind procedure is to develop a decision document that justifies a
generator winding replacement before a catastrophic failure. That decision depends on adequately
describing the condition of the winding and displaying the economic justification to support the
decision.
6-3. Guidance.
a. Replacement of generator stator windings shall be based upon the factors found in
Appendixes K, L and M. Each unit will be considered on its individual merits. Brief reports shall
be prepared that contain this evaluation. Consideration shall be given to uprating the unit,
whenever replacement of the winding is contemplated. Appendix N is a partial listing of technical
standards.
b. The factors identified in subparagraphs (1) and (2) shall be addressed in the report as a
basis to support the need for a generator rewind. The additional factors in subparagraph 3 shall
be addressed to support generator uprating, if recommended, and shall be included in the report.
If generator uprating is not recommended, the report shall address the factor or factors which
makes an uprating not feasible. In accordance with ER 1110-2-109, Hydroelectric Design Center
will prepare the engineering and design features of the reports and other engineering
documentation.
(1) Background Information. Provide a tabulation of pertinent data for the existing
generator, turbine, transformer and other associated equipment. See Appendix K.
(2) Rewind Evaluation. Provide an analysis of the need for any proposed rewind that
considers the condition of the existing winding and the impact of forced rewind if a scheduled
rewind is not accomplished. The analysis should be developed around Appendices L and M.
(3) Potential for Uprating. If uprating is recommended, an analysis shall be prepared to
demonstrate that an uprating is justified based on the following factors:
(a) Compatibility of new winding with existing generator circuit breaker, excitation
equipment, transformer, buswork, structural, etc.
6-1
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