International Electrotechnical Commission

ENvoltage unbalance factor, u 
defined as the ratio of the modulus of the negative-sequence to the positive-sequence components of the voltage at fundamental frequency, expressed as a percentage


NOTE 1 Phase-to-phase voltages may also be used instead of line to neutral voltages.

NOTE 2 For simplicity in this report u has been used to denote the voltage unbalance factor instead of u2.

An equivalent formulation is given in IEC 61000-4-30:

TC/SC:77ATerms     Info     Publications
Published in:IEC 61000-3-14, ed. 1.0 (2011-10) Terms     Info
Reference number:3.29.5

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