[Qucs-help] Electrical Ground Fault Model

[Ruben S C. P.E. <cor...@am...>]

Hi:

I am writing an engineering manual for an electrical grounding seminar.  I was looking for a circuit simulator to calculate the steady state, 60 Hz, ground fault voltage drop at different locations of the electrical distribution system during a ground fault.

I modeled the system as follows.



I am interested in knowing the voltage at locations MCC and SE.  Can this be done:

I have several questions:

1.  I assume that the voltage source in your model assumes it delivers infinite current. That is., an ideal voltage source. This is not true in practical systems.  We have a Utility service feeding a transformer.  The utility provides a maximum short circuit current at a certain voltage.  The utility delivers voltage with a maximum current.  The transformer changes the voltage but has an internal impedance. In your model the transformer does not have primary or secondary voltage levels, only the voltage ratio.It ou can I model this utility - transformer combination?  

I assume that I entered the values of resistance in a correct way my specifying m Ohm representing milli Ohms.  Is this correct.?

It would be great I could use this program in my grounding seminars.  But if this program is not the adequate, do you know of circuit simulator program more  geared to power?  I have SKM software but I can’t draw single phase diagrams like the above and I can not use SKM for this grounding analysis.

Thanks.

Ruben S. Corvalan, P.E.
Principal
AmpSAFE, LLC
210..241.4276 Mobile
210.998.3110 Office 1
210.957.2663 Office 2
cor...@am...
19141 Stone Oak Pkwy.
Suite 104-210
San Antonio, TX 78258Ruben S. Corvalan, P.E.
Principal
AmpSAFE, LLC
210..241.4276 Mobile
210.998.3110 Office 1
210.957.2663 Office 2
cor...@am...
19141 Stone Oak Pkwy.
Suite 104-210
San Antonio, TX 78258