A delta wye transformer connection is shown in schematic form in Figure 2, This transformer is a step- down arrangement from 4.2kV, line-line, to 480V, line-ine, both RMS. See Figure 3. The resistor on the wye side is drawing 100 A. A b B Figure 2 Transformer Hookup iba lac icb Figue 3: Sngle-Phe Loaded Tranbmer Cnnecetion a) How much power is being drawn on the wye side from each of the three transformer secondaries? b) What is the turn's ratio between the physical transformers that make up the three-phase transformer bank? c) What are the three currents in the primary side of each of the three transformers? Show them in a reasonably proportioned vector diagram. Show the voltages as well across those transformer windings Now the situation is reversed asshowninFigure4. This, too, is a 4.2kV (line-line, RMS) to 480 V transformer, but this time the wye side is on the high voltage and the delta is on the low voltage. A single resistor, drawing 100 A, is connected across two of the terminals of the 600 V secondary. Initially the wye side of the transformer is ungrounded. 1 What is the physical turn's ratio of these transformers? 2. Assuming that the wye side of the transformer is connected to a voltage source, draw currents in the primary windings IA, IB and iC, in relationship to the voltages on the wye side. 3. Show that the sum of real and reactive powers on the wye side matches the same quantities on the delta side. 4. Now the wye side of the transformer is grounded. What changes? ele rele

6. For the air core transformer circuit shown below, determine the currents la and lb in the direction shown. Express each answer in polar form. R1-302 www la ZI1=150 E=10/0 M=j20 Ze= n Z12=j62 lb R2=50 la Ib

Three single phase transformers are connected in a Delta-Wye configuration.  Each transformer is rated 13kV/64kV.  The transformers are connected to a 3 phase 13kV (L-L) supply and the balanced three phase load is 788KVA. What is the current magnitude in the secondary winding of each transformer? explain the steps too please

Excercies: 1. Two transformers A and R to a load of (2+jh5) Their impedanas in secondary terms Coltjo.6)5r EA = 200 Lov output and Power factor of each transformer are Connected in parallel ZA = (o15t+j 0.8)2 and zR= Their noload termind nltages are and Es = 21010V Fnd the poer are %3D 11 2. Two trans formes A andB of ratings 500KVA and 25okVA supplying a load kVA of 750 at a8 Pf lagging. Their open circuit voltayes are 400V and 410V respecctively. Transformer A has 1% rsistance and 5/ reactance and transformer B hay s resistance and 4 reactance. Fnd (a) Cross-curnt in the seondaries load shared by each transforcmer. are on no-load,b) the 2.