Zero Sequence Impedance in Cables

When the R and X Positive Sequence Impedances are entered in a cable library, the R and X Zero Sequence cells also get populated.



What equations/formula are used to calculate these values?

FRZERO_NONMAG = 1.5898f;
FXZERO_NONMAG = 2.5442f;
FRZERO_MAG = 3.1515f;
FXZERO_MAG = 2.4617f;

If DuctMaterial is "Non-Magnetic"
Rzero = FRZERO_NONMAG*Rpos;
Rzero = FXZERO_NONMAG*Xpos;

If DuctMaterial is "Magnetic"
Rzero = FRZERO_ MAG *Rpos;
Rzero = FXZERO_ MAG *Xpos;
Creation date: 2/13/2017 10:44 AM     Updated: 3/13/2017 11:18 AM