Q4. A 3-phase, 11kV/33 kV, star-delta connected power transformer is protected by differential protection. The CTs on the LV side have a current ratio of 400/5.determine the ratio of CTs on the HV side of transformer.
Q: A Transformer with 10:1 ratio and rated at 50-kVA, 2400/240-V, 50-Hz is used to step down the…
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Q: True or False? Consider a 3 phase transformer with same line to line voltage ratio. The delta…
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Q: INVESTIGATE the CT ratio and spill current setting of differential protection of transformer for the…
A: Transformer is delta star 36/16 kV 11 MVA CT secondary current=1A
Q: An ideal transformer is the one having no losses with some resistance in the winding. Select one:…
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Q: A single-phase transformer rated 75kVA, 8000/240V is given the short circuit test. With the…
A: Rated current in primary side =75*1038000=9.375 amp Short circuit test is done with secondary side…
Q: A 600kVA three phase transformer has iron losses of 900W and full load copper losses of 8100W. Find…
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Q: A12 Efficiency of DC machine is high as compared to the transformer. (TRUE/FALSE)
A: In all electrical machines transformer will have higher efficiency. Because there are no rotational…
Q: A 20-ohm resistance is connected across the secondary winding of a single-phase power transformer…
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Q: A transformer is rated 20k V/200KV, 350MVA and has an internal impedance of j6.42 as seen from the…
A: Data given for transformer are: 20kV/200kV, 350MVA and Z=j6.4Ω The impedance referred to secondary…
Q: Autotransformer has common winding for both primary and secondary. Select one: True False
A: Auto transformer is a type of transformer. It consists of single or only one winding.
Q: It is possible to connect A-Y transformer in parallel with another A-Y transformer? True O False
A: Is it possible to connect delta star transformer with another delta star transformer in parallel
Q: Q4-A single-phase, 10-kVA, 440/110-V, two- winding transformer is connected as an autotransformer to…
A: Solve as below
Q: Q4:A/The primary and secondary windings of a 30 kVA 76000/230, V, 1-phase transformer have…
A: This question belongs to electrical machine . It is based on the short circuit test of transformer .…
Q: A transformer is to be used to match an 8-Ωloudspeaker to a 500-Ω audio line. What is the…
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Q: A 1000-VA 380 / 110 V conventional transformer is to be used to supply power from a 490-V source to…
A: From the given data of normal transformer, KVA=1000 VAVP=380 VVS=110 V To the Auto-transformer…
Q: A4 An electrical engineer is required to select a Star-Star connected transformer or Delta-Star…
A: This question is belongs to applications of transformers
Q: With neat diagram explain auto transformer and write any two advantages
A: The autotransformer is the device that has only one winding that works both as the primary and the…
Q: Q2: a) Determine the efficiency of three-phase 400 kVA, 11kV/ 380 V transformer at over-loading…
A: The efficiency of a three-phase transformer is determined as shown below
Q: A) A single-phase transformer with a ratio of 440/110-V takes a no-load current of 5A at 0.2 power…
A: In the single phase transformer. What is primary current Ip = Io + IS ' Where Is' is secondary…
Q: In the open circuit test of a single phase transformer from the experiment 4, the secondary winding…
A: In this question we will find that given statement is true or false ..
Q: Three single phase transformers, each rated at 12kVA, 120/240V, 60Hz, are connected to form a…
A: Given data : Each rating of transformer =12 KVA Power factor =0.8 lagging
Q: 3. WRITE IN DETAIL ABOUT TRANSFOERMER, WHAT IS STEP DOWN TRANSFORMER USED FOR? with the help of…
A: A transformer is a static device, which converts electrical power from one circuit to the other…
Q: (a) As an Engineer you have been contracted by a power distribution company to investigate the…
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Q: For a 10 MVA, 132 kV/6.6 kV power transformer with delta-star connections, obtain the number of…
A: We have an power transformer with, MVA = 10 MVA HV Side Voltage = 132 KV LV Side Voltage = 6.6 KV…
Q: Q4: A 2.5 kVA, 200V/40V single-phase transformer has the primary resistance and reactance of 3 and…
A: To find the equivalent impedance of single phase transformer referred to the primary and secondary…
Q: 1. An ideal transformer with N, 2400 and N2 = 400 is connected with an imped %3D across winding 2,…
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Q: An ideal transformer can be used as impedance transformer. Select one :- True. False
A: We need to tell about given statement
Q: In an open-circuit test of a 10KVA 2400/240V 60-cycle distribution transformer, the low side volts,…
A: As per our policy i have attempted first three subparts Given data: V=67 VI=4.17 APF=0.80
Q: Q4: A 2.5 kVA, 200V/40V single-phase transformer has the primary resistance and reactance of 3 and…
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Q: Quiz2: We wish to connect a 6 kVA, 120/240 V transformer as an autotransformer to a 120 V source to…
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Q: 1. A single-phase step-down transformer is rated at 10 kVA, 208V/120 V. a. Compute the rated…
A: We can draw the circuit as a) Rated primary current IPrated=SVPrated=10000208=48.1A Rated secondary…
Q: A 10-kVA, 450/120V, 50-Hz transformer has the following circuit parameters: R, = 0.12 n, R, = 8.533…
A: As per Bartleby guidelines, since you have posted a question with multiple sub-parts, we will solve…
Q: Q4) A transformer is rated 20k V/200k V, 350MVA and has an internal impedance of j6.42 as seen from…
A: Rating of the transformer= 20kV/200kV, 350MVA
Q: Example 1: A single-phase, 100-kVA, 1000:100-V, 60-Hz transformer has the following test results:…
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Q: Q4: (A) A 10 MVA, 132 kV transformer is connected to the end of a transmission line of surge…
A: consider the given question,
Q: Example 19. Starting from the ideal transformer, obtain the approximate equivalent circuit of a…
A: The Turns ratio of the transformer = 6 The resistance and Reactance on the primary side are R1 =…
Q: Q4. A 3-phase, 11kV/33 kV, star-delta connected power transformer is protected by differential…
A: To draw the circuit
Q: Q4. A 100KVA, 200/4000V Y-A transformer has per phase in per-unit system Regpa"0.3, Xegga"0.4,…
A: Given: A 100 kVA, 200/4000 V Y-Δ transformer has per phase in the per-unit system Req.pu=0.3…
Q: Primary of Current Transformer is having less number of turns. Select one: True False
A: In this question , we will define turns in primary of current transformer..
Q: A 250kVA, single phase transformer is designed to have a resistance of 1.5% and maximum efficiency…
A: Consider the resistance is 1.5% The kVA is 250 The load is 160 kW The power factor is 0.8 W
Q: The primary and secondary windings of a 500-kVA, 11-kV/415-V, single-phase transformer have…
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Q: When two winding transformer is not connected to the load, primary balancing current flows in the…
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Q: As an Engineer you have been contracted by a power distribution company to investigate the causes of…
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Q: 82 Q.30: For the ideal transformer circuit shown, when V=16cos3t Volt, find the average power…
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Q: Q4) Calculate the value of the impedance seen by the source if the step-up transformer turns ratio…
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Q: The maximum efficiency of a 200KVA, 6000/230volt, 50HZ, single phase transformer occurs at half load…
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Q: The single-phase equivalent circuit parameters appearing on the high voltage (primary) windings side…
A: Given,primary winding internal resistance, R1=0.65Ωprimary winding leakage reactance,…
Q: The primary and secondary voltages of an auto-transformer are 500 V and 400 V respectively. Show…
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- In a 100-kVA, 6,000/400-V, Y-Y, 3-ph, 50-Hz transformer, the copper loss is measured at 5000 W during half-load. Apparently, the maximum efficiency also occurs at ¾ full-load, find the efficiencies of the transformer at full-load and at half-load both at 0.8 pfA transformer with a 10:1 ratio and rated at 60kVA, 2200/220V, 60Hz is used to step down the voltage of a distribution system. The low tension voltage is to kept constant at 220V. (a) What load Impedance connected to the low-tension side will be loading the transformer fully at 0.8 power factor (lag) ? (b) What is the value of this impedance referred to the high tension side?1. A single-phase step-down transformer is rated at 10 kVA, 208V/120 V. a. Compute the rated current of each winding. b. If a 2 Ω load resistance is connected across the 120 V winding, what are the currents in the high-voltage and low-voltage windings? c. What is the equivalent load resistance referred to the 208 V side? d. What is the lowest load resistance that is allowed by the transformer rating?
- Example: A single-phase, 100-kV A, 1000:100-V, 60-Hz transformer has the following test results: Open-circuit test (HV side open): 100 V, 6 A, 400 W Short-circuit test (LV side shorted): 50 V, 100 A, 1800 W * Draw the equivalent circuit of the transformer referred to the high- voltage side. Label impedances numerically in ohms and in per unit. » Determine the voltage regulation at rated secondary current with 0.6 power factor lagging. Assume the primary is supplied with rated voltage * Determine the efficiency of the transformer when the secondary current is 75% of its rated value and the power factor at the load is 0.8 lagging with a secondary voltage of 98 V across the load 55 EMI Transformers Dr Thamir Hassan ATYIA Tikrit University16. An ideal transformer is the one having no losses with some resistance in the winding. Select one: True FalseA Transformer with 10:1 ratio and rated at 50-kVA, 2400/240-V, 50-Hz is used to step down the voltage of a distribution system. The low-tension voltage is to be kept constant, if the transformer has: R = 2.2 0, R2 = 0.014 Q, X, = 4.1 0, X2 = 0.03 0, then, a. What load impedance connected to low-tension side will be loading the transformer fully. b. Calculate the equivalent resistance as referred to primary. c. Calculate the equivalent reactance as referred to primary. d. Calculate the equivalent impedance as referred to primary. e. Calculate the total Cu loss.
- A 5000-VA, 480/120-V conventional two-winding transformer is to be used to supply power from a 600-V source to a 480-V load operating as an auto-transformer. Consider the transformer to be ideal and assume that all insulation can handle 600 V. Determine the kilovolt-ampere rating of the auto-transformer.A 120:480-V, 10-kVA step-up two-winding transformer is to be used as an autotransformer to supply a 120-V circuit from a 600-V source (a step-down autotransformer). When it is tested as a two-winding transformer at rated load, unity power factor, its efficiency is 97.9 %. 1.Show the connection diagram of the transformer converted as an autotransformer and identify which is the series winding Nse and the common winding Nc.A 2,300/240-V, 60-Hz, 4.6-kVA transformer isdesigned to have an induced emf of 2.5 V/turn.Assuming an ideal transformer, finda. The numbers of high-side turns Nh and low-sideturns Nl .b. The rated current of the high-voltage side Ih.c. The transformer ratio when the device is used as astep-up transformer.
- I just need help with 3 and 5 Using the parameters from the Typical Transformer Values Sheet for a 12.4kV/600V, 100 kVA transformer operating at its rated voltage on the secondary side with its rated load with a PF of 0.8 lagging. Determine for each of the transformer models – deluxe, medium, and economy: Draw the circuit diagram. - DONE Find: The magnitude of voltage at the input to the primary side, ==== 12.4kV The power factor on the primary side, ==== .98 pf The reactive power absorbed by the transformer, The efficiency of the transformer, ===== 81% The voltage regulation of the transformer.A 25-kVA, 4000/400-V, 60-Hz transformer has the following parameters:R, = 18 Q, X, = 25 0, R, = 180 mQ, X, = 250 mQ, R,, = 15 kQ, andX,, = 25 kQ. If the open-circuit and short-circuit tests are performed onthis transformer, what are the readings of the instruments in each case? From the data given in above, determine the rating of the transformerat maximum efficiency. What is the maximum efficiency of thetransformer at unity power factor? What is the efficiency at full load andunity power factor?A 1000-VA 380 / 110 V conventional transformer is to be used to supply power from a 490-V source to a110-V load. Consider the transformer to be ideal, and assume that all insulation can handle 490 V. (a) Sketch the transformer connection that will do the required job (b) Find the kVA rating of the transformer in the configuration. (c) Find the maximum primary and secondary currents under these conditions