The presence of bridge rectifiers leads to the appearance of higher harmonics of n=6k [+ or -] 1 order (k is the natural number k = 1, 2, 3, 4, ...) in the AC network, which leads to an increase in the calculated current by an amount taken into account by the distortion coefficient v or the harmonic factor
[THD.sub.I] in accordance with the requirements of International Standards IEEE 519-1992 or IEC 61000-3-12:2012 [5-7].
The harmonic factor
[k.sub.wv] of sinusoidal winding is given in , The equations below show a procedure to calculate the v-th harmonic factor
of sinusoidal two-phase winding
The average minimum value of a voltage harmonic factor
was 1.1%, which is probably the harmonic level in MV and HV networks.
A = the harmonic factor
of the fundamental frequency signal at frequency f.sub.1.;
Since the eigenvalues of [B.sup.-1]C are the rational harmonic factors
, the eigenvalues of G are the rational harmonic factors
other than [xi].