Page 32 - Power Quality in Electrical Systems

Chapter
2

Power-Quality Standards

This chapter offers some details on various standards
addressing the issues of power quality in electric systems.
Standards are needed so all end users (industrial,
commercial, and residential) and transmission and
distribution suppliers (the utilities) speak the same language
when discussing power-quality issues. Standards also define
recommended limits for events that degrade power quality.

IEEE Standards 519 and 1159
IEEE Standards are publications that provide acceptable design practice.
IEEE Standards addressing power quality include those defining accept-
able power quality (IEEE Standard 519) and another standard relating
to the measurement of power-quality “events” (IEEE Standard 1159). In
later chapters of this book, we’ll use several figures from the IEEE
Standards so the reader will have a flavor for the coverage. Both of these
standards focus on AC systems and their harmonics (that is, multiples of
the line frequency).
IEEE Standard 519 [2.1] (denoted IEEE Std. 519-1992) is titled “IEEE
Recommended Practices and Requirements for Harmonic Control in
Electrical Power Systems.” The abstract of this standard notes that
power conversion units are being used today in industrial and com-
mercial facilities, and there are challenges associated with harmonics
and reactive power control of such systems. The standard covers limits
to the various disturbances recommended to the power distribution
system. The 1992 standard is a revision of an earlier IEEE work pub-
lished in 1981 covering harmonic control.
The basic themes of IEEE Standard 519 are twofold. First, the utility
has the responsibility to produce good quality voltage sine waves.

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