Calculation of Impedance is reasonably involved. Other notes give an insight into the individual calculations.
With myCableEngienering, the calculation will typically follow the following procedure
Positive and zero sequence impedance calculated above, are in complex form. The real part of the impedance gives the resistance and the imaginary part the reactance.
Currently we do not calculate capacitive reactance. This will likely be added as the application grows and develops the need for this calculation.
Impedance equations are presented in details in Impedance. Depending on the type of cable, number of cores and system type the following equations are applied:
Equations Z1/Z0 - for a.c. cables (refer Impedance)
Note: for armoured cables, the armouring and earth are always considered as part of the earth return path. Excepting TN-C-S, earth return through a spare internal conductor is not considered.
Note: current return through a spare internal conductor for low voltage cables is on our features list to be added