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Introduction
1-1. Purpose
This manual provides guidance and assistance to design engineers in the development of electrical designs for new hydroelectric power plants. The manual should be used when preparing electrical designs for hydroelectric power plants for civil works facilities built, owned, or operated by the Corps of Engineers. Treatment of electrical systems for pumped storage plants is not covered in the manual, although much of the information is applicable to  pumped storage plant systems and subsystems.

1-2. Applicability
This manual is applicable to all civil works activities having
responsibilities for the design of hydroelectric power
plants.


1-3. References
Required and related publications are listed in
Appendix A.


1-4. Scope
a. Generator rating. The manual presents good engineering practice in designing electrical systems for hydroelectric power plants employing generating units of up to approximately 300 MW in rating.
b. Plant features. The manual deals with the electrical features of hydroelectric power plants, and covers the generating equipment, station service, various switchyard and transmission line arrangements, details of lighting, communication and control, and protective devices for plant equipment and related auxiliaries. Generators and power transformers are treated under their respective headings, but other equipment, materials, and devices are discussed under the distinct functional systems in which they are used.
c. Specification preparation. Information is presented to facilitate the preparation of specifications for major items of equipment using pertinent approved guide specifications, and specifications for suggested plant design features which take into consideration the numerous ancillary and control details that are required to carry out the intended plant function. Where alternate designs of functional systems are discussed, a preferred design isindicated to secure a degree of uniformity in plants of similar size and character. These preferred designs should be followed unless unusual conditions make them unsuitable or unreasonably expensive.


1-5. Codes
Portions of the codes, standards, or requirements published by the associations or agencies listed below are applicable to the work. A complete listing of codes, standards, and guides is contained in Appendix A,“References.”
Institute of electrical and Electronics Engineers
(IEEE)
American National Standards Institute (ANSI)
Electric Power Research Institute (EPRI)
Illuminating Engineering Society (IES)
National electrical Manufacturers Association
(NEMA)
National Fire Protection Association (NFPA)
Underwriters Laboratory (UL)