-5. Draw the connection diagram for two parallel transformers with (A-A) connected?
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- For a short-circuit test on a 2-winding transformer, with one winding shorted, can you apply the rated voltage on the other winding? (a) Yes (b) NoConsider the three single-phase two-winding transformers shown in Figure 3.37. The high-voltage windings are connected in Y. (a) For the low-voltage side, connect the windings in , place the polarity marks, and label the terminals a, b, and c in accordance with the American standard. (b) Relabel the terminals a, b, and c such that VAN is 90 out of phase with Va for positive sequence.9. How does the concept of magnetic saturation impact the performance of transformers and inductors?
- Two 11,000/2,200-V, 1-phase transformers are connected in parallel to supply a total load of 200 at 0.8 p.f. lagging at 2,200 V. One transformer has an equivalent resistance of 0.4 ohms and equivalent reactance of 0.8 ohms referred to the low-voltage side. The other has equivalent resistance of 0.1 ohms and a reactance of 0.3 ohms. Determine the current and power supplied by each transformer.Example 2-2. The equivalent circuit impedances of a 20-kVA, 8000/240-V, 60-Hz transformer are to be determined. The open-circuit test and the short-circuit test were performed on the primary side of the transformer, and the following data were taken: Open-circuit test (on primary) Short-circuit test (on primary) Voc = 8000 V Vsc = 489 V loc = 0.214 A Isc = 2.5 A Voc = 400 W Ps = 240 W2- Draw and explain the phasor diagram for two transformers in parallel.
- Consider the three single-phase two-winding transformers shown in Figure. 3. The high-voltage windings are connected in Y. (a) For the low-voltage side, connect the windings in A, and label the terminals a, b, and c in accordance with the American standard. (b) Relabel the terminals a', b', and c' such that VAN is 90° out of phase with V₂'b' for positive sequence. DI H₂ Figure. 3: Three-Winding TransformerDraw the equivalent circuit for a 3000/400-V, l-phase transformer on which the following test results were obtained. Input to high voltage winding when I.v. winding is open-circuited: 3000 V, 0.5 A, 500 W. Input to 1.v. winding when h.v. winding is short- circuited: 11 V, 100 A, 500 W.If the secondary side of a dual-voltage single phase transformer, as per figure 1, were to be connected in series, the rated output current would be equal to the -A- current rating of the individual coils, B- sum of the current rating of the individual coils, C- either "a" or "b", D- neither "a" nor "b". If secondary side of the a dual-voltage single phase transformer, as per figure 1, were to be connected in paralle, the rated output current would be equal to the A- current rating of the individual coils, B- sum of the current rating of the individual coils, C- either "a" or "b", D- neither "a" nor "b". The poles of a magnet tend to be____________. A - at the ends of the magnet, B- in the middle of the magnet, C -all around the magnet, D- none of the above.

