Zero sequence resistance and reactance 1

[alwaink]

How do you calculate zero sequence resistance and reactance for an Electrical Submersible Pump (ESP) power cable?

As someone indicated, to calculate for zero sequence resistance, I'd have to include the resistance of one of the phases, plus three times the resistance of the cable outer shield (insulation resistance):

Rm = Km x log10(D/d),
where Km = insulation factor (PPE=50,000, EPDM=20,000)
D = diameter of the insulated conductor
d = diameter of copper conductor

But I can't figure out how to obtain zero sequence reactance. Can anyone help? I'd really appreciate it.

 

[Bung]

It's not a simple job. It is installation dependent too, just to make life interesting. Best is to measure it, 2nd best is to get the cable manufacturer to give you the design figures and if your installation method is the same as theirs, all is well. Third best is to guess based on the Z1 value - take X0 as around 5 - 9 times X1, R0 as 1 - 3 times R1. Or you could calculate it using the cable parameter calculation aids in things like EMTP, if you know all the cable conductor, insulation and laying details.



Bung
Life is non-linear...