PPT Slide
Section 12.9: The Nonideal Transformer and its Equivalent Circuits cont.
Examples 12.6 and 12.7 cont.
Calculate the transformer’s voltage regulation and efficiency when it serves its rated KVA load at 0.8 lagging power factor
Ep = aEs = 2427/0.35° V. so that the magnetizing reactance’s current is:
Im = Ep/j1.55 KW = 1.56/-89.65° A. and the core-loss resistor’s current is:
IC = Ep/10 KW = 0.2427/0.35° A. so that (by KCL) the primary current is:
Ip = Is/a + Im + IC = 63.65A./-37.86° A.
So the resulting equivalent circuit is … (next slide)