+, - & 0 impedance of Power Cables?
+, - & 0 impedance of Power Cables?
(OP)
Please can somebody tell me if there are usually any differences between the positive/negative and zero sequence impendances for HV power cables?
I need to carry out a short circuit analysis for a HV network and the cable data I am provided with are the 'Maximum a.c resistance of conductor ohm/m', 'Maximum d.c. resistance of conductor ohm/m' and 'Equivalent star reactance of 3-phase circuit ohm/m'. Are these sufficient to determine the +ve, -ve and zero sequence impedances of the cables?
Many thanks
I need to carry out a short circuit analysis for a HV network and the cable data I am provided with are the 'Maximum a.c resistance of conductor ohm/m', 'Maximum d.c. resistance of conductor ohm/m' and 'Equivalent star reactance of 3-phase circuit ohm/m'. Are these sufficient to determine the +ve, -ve and zero sequence impedances of the cables?
Many thanks






RE: +, - & 0 impedance of Power Cables?
Impedances may be calculated using the techniques in the Westinghouse T&D Handbook. Fault study software often includes modules for calculating cable impedances.
RE: +, - & 0 impedance of Power Cables?
So if you have an earth fault (eg dig-in) which results in the core and screen being shorted together at the end of a cable which nominally only has its screen earthed at the source end, you will get one value of fault current. If the fault is a few metres further along, beyond the cable termination, it will be a different value as there will no longer be a sheath return path.
Bung
Life is non-linear...
RE: +, - & 0 impedance of Power Cables?
http://www.kerite.com/catalog/catalogfiles/impedance_da...
for those impedances