lisah,
You need to understand the per unit system. You can pick up by reading any power engineering text book.
Vbase = 415 volts -> Voltage = 415 volts or 1.0 pu
KVAbase = 100 kva -> Power = 330 kva or 3.3 pu @80% pf
Ibase = KVAbase/Vbase/1.732 = 0.14 kA
Ipu = KVApu/Vpu = 3.3/1.0 = 3.3 pu...
In the DC world, when we calculate power loss, we use
Loss = R * I^2
In the AC world, we would like use the same formula. Therefore the concept of r.m.s was invented, such that we can do
Loss = R * I(r.m.s)^2
In certain sence, r.m.s is an equivalent current for loss calculation. Since...
