DYNA JOURNAL ENGINEERING

Key words:

Desequilibrio de tensión, Normas CEM, Distorsión, Calidad de la potencia eléctrica, Voltage unbalance, CEM standard, distortion, electric power quality.

Article type:

ARTICULO DE INVESTIGACION / RESEARCH ARTICLE

Section:

RESEARCH ARTICLES

Documents recently published by IEC and IEEE standard have adopted as a measure of voltage
unbalance the relationship between negative and positive sequence components. However, other imbalance indices are usual in practice, such as
voltage unbalance defined by the National Electrical Manufacturers Association, NEMA, in USA, or those based on the maximum deviations of average
voltages proposed by IEEE in its publications. This article analyzes the different definitions of voltage unbalance introduced in several standards over
the last decades. Thus, a comparative assessment of different definitions versus the imbalance factor adopted by IEC has been carried out. This index is considered the true imbalance in this text. To do this, several simulation and experimental setups have been designed. The results obtained have allowed the importance of adopting a definition to achieve a correct imbalance measure in the characterization of voltage asymmetry in electricity networks to be highlighted.