Hi.

As per one example in ETAP, Utility Information is given below

MVA 3phase is 1500 MVA
KV L-L is 34.5kV
Current Short Circuit is 25.1kA
computed as MVA 3phase / (1.732*kV L-L)

for this one I have no problem. The problem that confuse me is the MVA L-G, as per data given below

MVA 1phase is 1640 MVA
Current Short Circuit is 27.4kA
computed as MVA 1phase / (1.732*kV L-L)

Now the question is as follows:
1. How come that the MVA 1phase is 1640 MVA? MVA 1phase is just MVA 3phase /3 and suppose to be 1500/3 = 500 MVA.
2. Why is the formula for single phase short circuit above has sq rt of 3 (this is for 3 phase only)?

Hope you could help me