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IEEE 666

2007 Edition, March 22, 2007

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Design Guide for Electric Power Service Systems for Generating Stations

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(This foreword is not a part of IEEE Std 666-1991, IEEE Design Guide for Electric Power Service Systems for Generating Stations.)

This document is primarily tutorial in nature as it is intended to provide guidance and direction in the design of electric power service systems for electric power generation plants. The guidance and direction given in this document is, for the most part, general in nature, and is applicable to all types and sizes of electric power generating plants.

This guide does not provide unique and specific design direction and guidance for special systems in the various types of electric power generating plants, but rather provides the basic framework upon which any required unique and specific designs can be built. An electric power service system consists of a main auxiliary power distribution network, which may supply many subsystems such as electric trace heating systems, dc systems, Class 1E power systems, etc. It is recommended that the reader consult industry standards that address these specific subsystems in more detail as appropriate during the design process.

This design guide was prepared by the Auxiliaries Systems Working Group of the Station Design Subcommittee of the Energy Development and Power Generation Committee of the IEEE Power Engineering Society.


While this design guide applies to all types of power generating stations, it is particularly applicable to stations in which the electric power service system is required to perform continuously. When electric power for auxiliaries is supplied from the power grid, the service system begins at the point where the tap from the power grid terminates, either at a station service bus or at the terminals of the transformer that supplies the bus.

When service to auxiliaries is from independent generators or electric storage batteries that are not normally operated as power supplies to the power grid, the station service system includes the generators and storage batteries. The service system includes all of the electric power using devices it serves, such as motors, resistance heaters, rectifiers, etc.

This guide contains a listing of typical power plant auxiliaries and criteria for their power service and examples of single-line diagrams for a typical plant. It also includes tables of typical power service parameters to illustrate the range of typical values for each parameter, and it identifies the approximate effect of the minimum and maximum value of each parameter on the load. Each section, as appropriate, has a bibliography of industry codes and standards and other reference documents that provide detailed guidance in the design and specification of station service system components.