Solve for the efficiency at three-eight load at 0.85 power factor of a 10-kVA single phase transformer with the full load copper loss and core losses are 152 and 128 watts, respectively.
Q: Consider Figure 1 of the text. For an ideal phase-shifting transformer, the impedance is unchanged…
A: Referring to the given hints, the impedance of the secondary side seen from the primary side:
Q: A three-phase generator step-up transformer i
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Q: A 250 MVA, 11/400 kV 3-phase power transformer has a leakage reactance of 0.05 pu on the base of 250…
A: Given values are - Rating=250MVAVLVH=11400Xpu=0.05
Q: (a) A 220 / 400V, 13KVA, 50Hz single phase transformer has at full load, a copper load of 140W. If…
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Q: A 200 – MVA, 15/200 kV single-phase power transformer has a per – unit resistance of 1.2 percent…
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Q: Problem-13 A50-kVA, 13,800/208-V, 4-Y distribution transformer has a resistance of 1 percent and a…
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Q: A 3300/230 V, 50-kVA, transformer is found to have impedance of 4% and a Cu loss of 1.8% at…
A: Given data, A 3300/230 V, 50-kVA transformer percentage impedance = 4% and Cu loss = 1.8% at…
Q: A 12-kVA, 240/120-V conventional transformer is to be reconnected as auto-transformer to supply…
A: Connect the auto transformer winding as below
Q: 2. A 3-phase, 6,600/415-V, 2,000-kVA transformer has a per unit resistance of 0.02 and a per unit…
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Q: The diagram for a single phase 60 MVA transformer is given below. Convert it to a Step-down…
A: Design the step down autotransformer Single phase transformer have 60MVA 50/100kV Find the all…
Q: If the open circuit voltage is 227V and the full load voltage is 207V, then the percentage…
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Q: A 40000-KVA, 25000-V/600-kV, single phase transformer has the following series impedances: Z1=…
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Q: Consider that three single-phase transformers are connected as Delta in the primary and Wye in the…
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Q: An 11,000/230-V, 150-kVA, 50-Hz, 1-phase transformer has a core loss of 1.4 kW and full-load Culoss…
A: In this question , transformer cu loss and iron loss given..Output KVA given..We have to find out…
Q: A single phase transformer with 50 kVA, 2400V/240V, 50 Hz; Idle operating voltage 2400V, idle…
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Q: a) What is the complex power drawn and delivered by the transformer? (b) Draw a per-phase equivalent…
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Q: - When a 100-kVA single-phase transformer was tested in this way, the following data were obtained:…
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Q: You have been tasked with comparing the transformer from ABC Ltd. with a 65 kVA, 11000 V/415 V, 50…
A: Given R1=10 ΩR2 =0.05 ΩX1 =20 ΩX2 =0.12 ΩXm =20 kΩRc = 200 kΩS =65 kVApower factor =0.8V2V1=11000415
Q: A 3000V/4400V, single-phase transformer takes a no-load current of 0.5A and the iron loss is 200W.…
A: We will solve this question by using the no-loaad conditions of the transformer.
Q: 1. Consider a three-phase transformer with a rating of 700 MVA and a secondary voltage of 145 kv.…
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Q: For a conceptual single-phase phase-shifting transformer, the primary voltage leads the secondary…
A: Note: As per our policy, I have attempted the first three subquestions. Given data: E1=E2+308E2=277…
Q: Q/ An 11,000/230-V, 150-kVA, 50-Hz, 1- phase transformer has a core loss of 1.4 kW and full-load…
A: Given, Full load KVA=150KVA frequency, f=50Hz core loss=1.4kW full load copper loss = 1.6kW
Q: 4. A 3-phase transformer, ratio 33/6.6-kV, A/Y, 2-MVA has a primary resistance of 89 per phase and a…
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Q: The per-unit system calculations method allows to: Select one: O a. eliminate the need for explicit…
A: Most of human energy requirement is meet by generating electrical energy. Once electrical energy is…
Q: A 10-kVA, 480/120-V conventional transformer is to be reconnected as auto-transformer to supply…
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Q: 9. While conducting short short circuit test in a transformer, which side is short circuited?
A: We are authorized to answer one question at a time, since you have not mentioned which question you…
Q: 14. In a 50-kVA, 11-kV/400-V, single-phase transformer, the iron and copper losses are 500 W and 600…
A: Given data, KVA rating S = 50 KVA Voltage rating 11 KV / 400 V Iron loss Pi=500 W Copper loss,…
Q: a) Discuss why a starldelta or delta/star configuration of a three-phase transformer is optimal for…
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Q: Consider a single phase transformer of rating 150 KVA, 1500/150, 50 Hz. Let the series resistance…
A: Given: Z1=R1+jX1=0.2+j0.45 ΩZ2=R2+jX2=0.002+j0.0045 ΩKVA=150
Q: In a 1-phase transformer of 20 KVA, 2000/200 volts, the iron and copper losses are 400 W and 500 W…
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Q: 1. (a) The diagram for a single phase 60 MVA transformer is given below. Convert it to a Step-down…
A: Given 2-winding transformer details are V1/V2=50/100 kV.S=60 MVA The input and output currents of…
Q: Determine: A2rdg, A3rdg, IL(ave), PL(ave), & turn ratio of transformer
A: For a given circuit, Vp(rms) =220 V f=50 Hz A1 =400 mA load resistance RL =120 Ω
Q: A 150 kVA, 2500/250 V, 50 Hz, single phase transformer has a no-load current of 0.75 A and a core…
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Q: Q4(b) A 200-MVA 15/200-kV single-phase power transformer has a per-unit resistance of 1.2 percent…
A: Firstly the exact equivalent model of a transformer is as shown below:
Q: PROBLEM A 3300V/440V, single-phase transformer takes a no-load current of 0.8A and the iron loss is…
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Q: Q1: What is the influence of transformer connections in single-phase transformers connected for 3-…
A: According to the Bartleby guidelines “Since you have asked multiple question, we will solve the…
Q: For an ideal 2-winding transformer, the armpere-turns of the primary winding, N1/1, is equal to the…
A: For the magnetic circuit, the magneto-motive force is given as:
Q: Q/ The efficiency of a 400-kVA, single-phase, 60-Hz transformer is 98.77% when delivering full-load…
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Q: Consider a 3-phase transmission line operating at 66 KV and connected through a 1000 KVA transformer…
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Q: In a 25-kVA, 2000/200 V, single-phase transformer, the iron and full-load copper losses are 350 and…
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Q: 4- When a 100-kVA single-phase transformer was tested in this way, the following data were obtained:…
A: The efficiency of a transformer is a measurement of the performance factor of the windings. This…
Q: A 600 kVA, 1-phase transformer has an efficiency of 92 % both at full-load and half- load at unity…
A: Given, Output kVA rating = 600 kVA Efficiency, η=92 % (both at full-load and half-load) Power…
Q: Justify if in a Yy transformer (without neutral wire on the supply side) there are homopolar…
A: Here it is mentioned that in a three Yy transformer there are homopolar components of fluxes,…
Q: A transformer on no-load has a core-loss of 20 W, draws a current of 1 A (rms) and has an induced…
A: According to guidelines we need to solve only the first question. According to the question we have…
Q: a) Discuss two (2) advantages and disadvantages of using three single-phase transformers instead of…
A: NOTE: Since you have asked multiple questions, we will solve the first question for you. If you want…
Q: A single-phase transformer, working at unity power factor has an efficiency of 90 % at both…
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Q: A 200 – kVA transformer with impedance of 5 percent and the power factor of the load is 85 percent.…
A: Given, A transformer with KVA rating, S=200 kVA Impedance, Z=5% Power factor, cosϕ=85%=0.85 Primary…
Q: (b) In a transformer test, data from short circuit and open circuit tests of a 75-kVA, 4600-230V,…
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Q: The label values of the single-phase transformer whose electrical equivalent circuit is given…
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Q: (a) The per unit voltage regulation when the transformer delivers full-load current at a power…
A: A transformer is an electrical machine which is used in AC circuit to either step up or step down…
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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) NoAn ideal transformer has no real or reactive power loss. (a) True (b) FalseA 23/230-kV step-up transformer feeds a three-phase transmission line, which in turn supplies a 150-MVA,0.8 lagging power factor load through a step-down 230/23-kV transformer. The impedance of the line and transformers at 230kVis18+j60. Determine the tap setting for each transformer to maintain the voltage at the load at 23 kV.
- A single-phase, 50-kVA,2400/240-V,60-Hz distribution transformer has the following parameters: Resistance of the 2400-V winding: R1=0.75 Resistance of the 240-V winding: R2=0.0075 Leakage reactance of the 2400-V winding: X1=1.0 Leakage reactance of the 240-V winding: X2=0.01 Exciting admittance on the 240-V side =0.003j0.02S (a) Draw the equivalent circuit referred to the high-voltage side of the transformer. (b) Draw the equivalent circuit referred to the low-voltage side of the transformer. Show the numerical values of impedances on the equivalent circuits.Three single-phase, two-winding transformers, each rated 450MVA,20kV/288.7kV, with leakage reactance Xeq=0.10perunit, are connected to form a three-phase bank. The high-voltage windings are connected in Y with a solidly grounded neutral. Draw the per-unit equivalent circuit if the low-voltage windings are connected (a) in with American standard phase shift or (b) in Y with an open neutral. Use the transformer ratings as base quantities. Winding resistances and exciting current are neglected.Consider an ideal transformer with N1=3000andN2=1000 turns. Let winding 1 be connected to a source whose voltage is e1(t)=100(1| t |)volts for 1t1ande1(t)=0 for | t |1 second. A2- farad capacitor is connected across winding 2. Sketch e1(t),e2(t),i1(t),andi2(t) versus time t.
- The ideal transformer windings are eliminated from the per-unit equivalent circuit of a transformer. (a) True (b) FalseThe ratings of a three-phase three-winding transformer are Primary(1): Y connected 66kV,15MVA Secondary (2): Y connected, 13.2kV,10MVA Tertiary (3): A connected, 2.3kV,5MVA Neglecting winding resistances and exciting current, the per-unit leakage reactances are X12=0.08 on a 15-MVA,66-kV base X13=0.10 on a 15-MVA,66-kV base X23=0.09 on a 10-MVA,13.2-kV base (a) Determine the per-unit reactances X1,X2,X3 of the equivalent circuit on a 15-MVA,66-kV base at the primary terminals. (b) Purely resistive loads of 7.5 MW at 13.2 kV and 5 MW at 2.3kV are connected to the secondary and tertiary sides of the transformer, respectively. Draw the per- unit impedance diagram, showing the per-unit impedances on a 15-MVA,66-kV base at the primary terminals.For an ideal 2-winding transformer, the ampere-turns of the primary winding, N1I1 is equal to the ampere-turns of the secondary winding, N2I2 (a) True (b) False
- In per-unit equivalent circuits of practical three-phase transformers, under balanced thr-phase operation, in which of the following connect ions would a phase-shifting transformer come up? (a) Y-Y (b) Y- (c) -For developing per-unit equivalent circuits of single-phase three-winding transformer, a common Sbase is selected for all three windings and voltage bases are selected in proportion to the rated voltage of the windings (a) True (b) FalseA bank of three single-phase transformers, each rated 30MVA,38.1/3.81kV, are connected in Y- with a balanced load of three 1, Y-connected resistors. Choosing a base of 90MVA,66kV for the high-voltage side of the three-phase transformer. spify the base for the low-voltage side. Compute the per-unit resistance of the load on the base for the low-voltage side. Also, determine the load resistance in ohms referred to the high-voltage side and the per-unit value on the chosen base.