IEEE 666-2007

Revision Standard - Inactive-Reserved.

This guide applies to station service systems that supply electric power to auxiliary loads for electric power generating stations.

The discussions and recommendations in this guide provide the practices, criteria, and range of system parameters that relate to the service system requirements and assist in the application of existing engineering documents.

This guide is not a handbook of design data; however, it explains what is good power service systems for generating stations.

Revision of IEEE Std 666-1991

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 auxiliary loads 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 auxiliary loads 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 auxiliary loads and criteria for their power service
• examples of single-line diagrams for a typical plant
• tables of typical power service parameters to illustrate the range of typical values for each parameter
• identification of the approximate effect of the minimum and maximum value of each parameter on the load

Each clause, as appropriate, has a bibliography of U.S. industry codes and standards and other reference documents that provide detailed guidance in the design and specification of station service system components.

The purpose of this revision is to update the guide in general, including:

• General update of references and correction of typo errors, and review the impact of the latest revisions of other standards on this document;
• Evaluate and consider expanding the level of details in the guide;
• Address comments received since the guide was published in 1991;
• Add clarifying text where indentified to be needed;
• Expand information in sections where more state of the art data is available.