Attached is a short circuit fault report that was done for a particular bus in our facility. I seem to be able to understand most of the report but wanted some help clarifying what some of the items on the report meant.
The first one under each fault analysis is the "Ini Sym RMS fault current" of 23927A. Is this esentially the maximum RMS fault current that occurs during a particular fault? Is this the RMS fault current that appears initially in the first cycle or half cycle?
The second value is the "Asym Rms interrupting Amps". Is this the asymmetrical fault current that occurs during a fault as a result of the DC offset? Is this vaule of current what is obtained by multiplying the Sym RMS fault current by 1.6 to account for the DC offset?
Lastly there is a "Ini RMS faulted current" that shows the fault current on each phase. I'm assuming that this is the same as the first Ini sym RMS fault current listed above, but including values for each of the phases.
Since motor contribution is not included in this fault report I'm guessing thats the reason why the system branch flows show 0 (branches are all downstream of faulted bus) Had motor contribution been included then then I'm assuming that system branch flows would show current flowing into fault as a result of motor contribution.
The first one under each fault analysis is the "Ini Sym RMS fault current" of 23927A. Is this esentially the maximum RMS fault current that occurs during a particular fault? Is this the RMS fault current that appears initially in the first cycle or half cycle?
The second value is the "Asym Rms interrupting Amps". Is this the asymmetrical fault current that occurs during a fault as a result of the DC offset? Is this vaule of current what is obtained by multiplying the Sym RMS fault current by 1.6 to account for the DC offset?
Lastly there is a "Ini RMS faulted current" that shows the fault current on each phase. I'm assuming that this is the same as the first Ini sym RMS fault current listed above, but including values for each of the phases.
Since motor contribution is not included in this fault report I'm guessing thats the reason why the system branch flows show 0 (branches are all downstream of faulted bus) Had motor contribution been included then then I'm assuming that system branch flows would show current flowing into fault as a result of motor contribution.