Impedance of power cable
Impedance of power cable
(OP)
In the electrical specification of power cable, I found that the positive sequence impedance and zero impedance of 500 mm sq 132kV cable is lower than 500 mm sq 11kV cable. Is the impadance depends on conductor size or other parameters? Any expert can give me advise on this?






RE: Impedance of power cable
You should also check to see what temperature is used as a reference point for both resistances given. This can make a significant difference in resistance.
RE: Impedance of power cable
RE: Impedance of power cable
-Material
-Length
-Cross sectional area
-Temperature
Basic formula is R=P(L/A)
R=Resistance
p=Resistivity
L=Length (ft)
A=Cross sectional area (CM)
Resistivity (p) for copper at 20C is 10.37.
As Length increases resistance is increased. As temperature is increased resistance is also increased. Greater cross sectional area (bigger wire), resistance is decreased.
RE: Impedance of power cable
http://www.selinc.com/techpprs/underground.pdf
etc. for more info.
Notice that the zero sequence impedance depends on the grounding system of the cable.