Zero seq. and positive seq. impedance of single phase line
Zero seq. and positive seq. impedance of single phase line
(OP)
The positive seq. impedance and the zero seq. impedance for a single phase line are the same.??
recently i got some data for the line impedances for distribution lines. A single phase line has been tapped off from a 3-phase line. The single phase line's zero sequence impedance is not the same as its positive seq. impedance, which I thought is usually the case.
recently i got some data for the line impedances for distribution lines. A single phase line has been tapped off from a 3-phase line. The single phase line's zero sequence impedance is not the same as its positive seq. impedance, which I thought is usually the case.






RE: Zero seq. and positive seq. impedance of single phase line
RE: Zero seq. and positive seq. impedance of single phase line
Fortescue demonstrated that any set of N unbalanced phasors — that is, any such "polyphase" signal — could be expressed as the sum of N symmetrical sets of balanced phasors known as symmetrical components.
Conclusion:
It is applied only to three-phase(polyphase) system
RE: Zero seq. and positive seq. impedance of single phase line
RE: Zero seq. and positive seq. impedance of single phase line
RE: Zero seq. and positive seq. impedance of single phase line
You cannot separate single phase from 3-phase even you are interested in Z0 on a single phase lateral. It is still from a 3-phase system. There is no much difference between a 3-phase and a single phase in terms of zero sequence impedance calculation if you stand at the fault location looking back into the system. You may have a larger Z1 (single phase lateral taking off from a 3phase transformer), but the Z0 will be determined by your first upstream 3-phase transformer's winding configuration.