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General Discussion. IEEE Std 399-1990, IEEE Recommended Practice for Industrial and Commercial Power System Analysis, commonly known as the IEEE Brown Book, is published by the Institute of Electrical and Electronics Engineers (IEEE) as a reference source to give plant engineers a better understanding of the purpose for and techniques involved in power system studies. The IEEE Brown Book can also be helpful in system and data acquisition for an engineering consultant to perform necessary engineering studies prior to designing a new system or expanding an existing power system. Such information will help ensure high standards of power system reliability and maximize the utilization of capital investment.

The IEEE Brown Book has been prepared on a voluntary basis by engineers and designers functioning as a Working Group within the IEEE, under the Industrial and Commercial Power Systems Department of the Industry Applications Society. This Recommended Practice is not intended as a replacement for the many excellent texts available in this field. The IEEE Brown Book complements the other IEEE color book standards, and it emphasizes up-to-date techniques in system studies that are most applicable to industrial and commercial power systems.