A 50-KVA 2400:240-V 60-Hz distribution transformer has a leakage impedance of 0.72 + j0.922 in the high-voltage winding and 0.0070+ j0.0090 2 in the low-voltage winding. At rated voltage and frequency, the impedance Z, of the shunt branch (equal to the impedance of R. and jXm in parallel) accounting for the exciting current is 6.32 + j43.7 52 when viewed from the low-voltage side. Draw the equivalent circuit referred to (a) the high-voltage side and (b) the low-voltage side, and label the impedances numerically.

3. A non-ideal 1-phase transformer has turns ratio 5:1 with 120Vac primary.  The primary impedance is 1 + j1 Ohms, and the secondary impedance is 0.2 + j0.2 Ohms.  Assume the core impedance (R0 and X0) can be neglected.  A resistive load of 12 Ohms is connected to the secondary.   What is the primary current magnitude? What is the secondary voltage magnitude? What is the efficiency of this transformer with this load?

2. Given three identical ideal single-phase transformers with each rated at 100KVA and 7kV/3.5kV, they are connected as a three-phase transformer bank. The three-phase transformer has high voltage side connected in delta and the low voltage side is connected in wye. A three-phase 200KVA, wye connected load is connected at the low voltage side of the transformer. Calculate the following: a. Rated line-to-line voltage on each side b. Line current on each side of the transformer

When the transformer is loaded in a balanced fashion up to its nominal rating (10 MVA), calculate the high side line-to-line phasor voltages (ab, bc, ca). and low side phasor voltages both line-to-line and line-to-neutral (ab, bc, ca, a, b,c). as a reference for calculations the low side A line to neutral voltage is 7620V at an angle of 0 degrees when the transformer is at rated power.  The transformer has the following characteristics: V: 138kV delta high side/ 13.2 kV wye low side 9% impedance X/R ratio of 20