Corner grounded delta and power system analysis programs
Corner grounded delta and power system analysis programs
(OP)
I am trying to compare the short circuit currents in a partial network "fed" by
1) the secondary (or tertiary) of a transformer connected in delta with one phase grounded ("corner grounded delta")
2) the secondary (or tertiary) of a transformer connected in a grounded wye (Yn)
There may be different types of faults, and the fault may be anywhere in the partial network, not necessarily at the transformer secondary.
It seems that the fault currents may be different in the two cases.
My question is, which of the well known power system analysis programs (SKM, EDSA, DigSilent, ETAP, etc) cover the case of the corner grounded delta?
1) the secondary (or tertiary) of a transformer connected in delta with one phase grounded ("corner grounded delta")
2) the secondary (or tertiary) of a transformer connected in a grounded wye (Yn)
There may be different types of faults, and the fault may be anywhere in the partial network, not necessarily at the transformer secondary.
It seems that the fault currents may be different in the two cases.
My question is, which of the well known power system analysis programs (SKM, EDSA, DigSilent, ETAP, etc) cover the case of the corner grounded delta?






RE: Corner grounded delta and power system analysis programs
RE: Corner grounded delta and power system analysis programs
RE: Corner grounded delta and power system analysis programs
RE: Corner grounded delta and power system analysis programs
RE: Corner grounded delta and power system analysis programs
Wow, thanks; that was a notable oversight on my part.
I wonder if you could estimate the fault by treating it as single phase to ground fault at the end of a cable fed by a single phase xfmr? I mean if you have a 480delta:208Vdelta corner ground, I wonder how close you would be if you told SKM that you have a 480V(A-B) to 208 single phase xfmr, and the faulted the end of your 208V cable. Of course, now you have to spend more $ to get the SKM single phase analysis module.
A related issue is that ground fault impedance for cable is largely a guesstimation. The typical impedance tables such as in the NEC and the IEEE Red book are for balanced three phase current (Z1). A few resources will list Zo for cable, but they are all over the map; there are just so many variables.
RE: Corner grounded delta and power system analysis programs