4. A 120/240 volt 10kVA two-winding transformer is to be reconnected as a step-up 120/360 volt auto-transformer. What is the kVA rating of the new auto- transformer connection? (10 pts)
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- Three single-phase two-winding transformers, each rated 3kVA,220/110volts,60Hz, with a 0.10 per-unit leakage reactance, are connected as a three-phase extended autotransformer bank, as shown in Figure 3.36(c). The low-voltage winding has a 110 volt rating. (a) Draw the positive-sequence phasor diagram and show that the high-voltage winding has a 479.5 volt rating. (b) A three-phase load connected to the low-voltage terminals absorbs 6 kW at 110 volts and at 0.8 power factor lagging. Draw the per-unit impedance diagram and calculate the voltage and current at the high-voltage terminals. Assume positive-sequence operation.A single-phase step-down transformer is rated 13MVA,66kV/11.5kV. With the 11.5 kV winding short-circuited, rated current flows when the voltage applied to the primary is 5.5 kV. The power input is read as 100 kW. Determine Req1andXeq1 in ohms referred to the high-voltage winding.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) No
- (Question 2): Answer the following questions: 1. The equivalent circuit impedances of a 20-kVA, 800CV240-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) VDC=8000V VS.c=489V IDC=0.214 ISc=2.5A PDC=400W PS.C=240W Find the impedances of the approximate equivalent circuit referred to the primary side, and sketch that circuit. 2. Based on the following Simulink model, answer the following questions: Continu pover Geet Gebe Rator p n Lea N) Ceongre tre ma Main Aaitay wengs Curet nent Mean nuoed Torge N nuneng reA votag eaen+ wineng A Singe Pa Anonenous ne Spe samgcapacter Froms Le votag Lne Curet From? (a) For which type of single phase induction motors does this circuit represent? (b) Explain the purpose of C1 in induction motors? (c) How to reverse the direction of rotation of this motor ? (d)…4. A single-phase, 1000-kVA, 2400/8000-V, 60HZ distribution transformer has the following parameters: Resistance of the 2400-V winding: R1 = 2.75 2 Resistance of the 8000-V winding: R2 = 29.4 2 Leakage reactance of the 2400-V winding: X1= 1.8 Q Leakage reactance of the 8000-V winding: X2 = 20 2 Exciting admittance on the 2400-V side: 0.002 - j0.008 S %3| Draw the equivalent circuit referred to the high voltage side of the transformer. a. b. Draw the equivalent circuit referred to the low voltage side of the transformer. Show the numerical values of impedances on the equivalent circuits. 5. The transformer in Problem 4. is supplying a rated load of 1000-kVA at a rated secondary voltage of 8000 V and at 0.8 power factor lagging. Neglecting the transformer exciting current, determine the input terminal voltage of the transformer on the low-voltage side.Three transformers, are connected delta on the primary side and Wye on the secondary side, step the voltage down from 13,200 to 460 volts and deliver a 750 Kva, 0.8 power factor load. Calculate (a) the ratio of transformation of each transformer (b) the Kilovolt ampere and kilowatt load on each transformer (c) current delivered to the load (d) current in primary line wires (e) current in each secondary transformer winding (f) current in each primary
- 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 Ve = 489 V Ioc = 0.214 A Isc = 2.5 A Poc = 400 W Pyc = 240 W Find the impedances of the approximate equivalent circuit referred to the primary side, and sketch the circuit.CALCULATE REACTANCE( NEED ONLY HANDWRITTEN SOLUTION PLEASE OTHERWISE DOWNVOTE).QUESTION [3] A no-load and short-circuit test should be conducted on a 220V/110V, 280VA transformer. a. Draw the circuit diagram for the no-load test and include all measurements that should be made. Also write down the maximum voltage that you should apply to the primary winding and estimate the current drawn from the supply. (5) b. Draw a circuit diagram for the short-circuit test and include all measurements that should be made. Also write down the maximum current that should be allowed to flow in the primary winding and estimated the primary voltage that will cause this value of the current to flow. (5)
- A single-phase 100 kVA, 2400/240 V, two-winding transformer will be used as a step-down auto-transformer in a 2640/2400 V system. The connection diagram of the transformer is given below. Calculate the I1, I2 and Ix currents given in the figure. Compare the kVA values of the auto transformer with the kVA values of two-winding transformers.A 100 KVA, 2000/200V 1-phase 2-winding Transformer is to be used as an auto transformer for stepping up the voltage from 2000 V to 2200 V. At rated load, the 2-winding Transformer has 2.5% loss, 3% voltage regulation & 4% impedance for an auto transformer determine (a) Voltage & current rating (b) KVA rating (c) Effiiency (d) Percentage impedance (c) Voltage regulation (f) Short circuit current on each side.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 W