Here's some info in close regards to your posted items:
***Zero-phase-sequence Reactances and Capacitances***
The Inductive and Capacitive Reactances explained here are also known as "Positive-phase-sequence Reactances", and are used in the conventional balanced-load flow problems of 3Ø circuits.
When Earth return currents (due to faults or other causes) must be calculated, Negative-phase-sequence and Zero-phase-sequence Impedances must be determined.
Negative-phase-sequence quanities are the same as Positive-phase-sequence. Precise determination of the Zero-phase-sequence quanities is impossible, because of the variability of the Earth-return path(s). Methods have been developed, which give sufficient results.
(§"Symmetrical Components" - Wagner, C.F., and Evans, R.D.)
Zero-sequence Impedance is a function of Conductor Size, spacing, position with respect to grounded areas, electrical characteristics, and the resistivity of the Earth-return circuit.
I have some formulas, which if needed (and are simple to convert to a format which posts well in the thread) can be made available.
It seems (to me) the items referenced in the IEEE article, are more directed towards Transmission circuits than towards Premisis Wiring and circuits (circuits at the customer's end). Just curious if you were aware of that and if it (the article) actually is covering Transmission circuits.
I am not trying to say the information is of no use - only that it might not apply to very many of your projects - unless those projects happen to be long distance Transmission circuits, in which case the information fully applies! (just ignore this paragraph if you wish!...Dohhh!)
As mentioned by "Winnie" (Jonathan Edelson), these terms typically are covered when Harmonics come into play. Normal areas of application using terms such like "Zero-phase-sequence" and/or "Positive/Negative-phase-sequence" in Harmonic scenarios include Motors, Motor Feeders, SCA (Short Circuit Amperes) calcs and OCPD sizes, Harmonic Filter designs, and level of THD (Total Harmonic Distortion).
Other areas include Inverters, Rectifiers, Transformers, Skin Effect calcs, GFCI / GFPE sense coil designs, and Power Factor correction.
You have posted a good topic for discussion, and I hope others with more pertant data will chime in here! Just wish I could post more info, so let me know in what type of design / application are you planning to apply considerations of "_X_ -phase sequence" to, or if it's just a "General / Whaddaheckisdat" question.
Does any of this make helpful sense towards your question, or have I just posted irrelevant data?
Scott35
