Delmar's Standard Textbook Of Electricity
7th Edition
ISBN: 9781337900348
Author: Stephen L. Herman
Publisher: Cengage Learning
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Chapter 28, Problem 2RQ
Two transformers rated at 100 kVA each are connected in an open-delta connection. What is the total output power that can be supplied by this bank?
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What happen when the two transformers are operated in parallel having un equal turn’s ratio?
In the circuit in Figure 2, the capacitor connected to the a-b terminals of the transformer anda circuit consisting of resistance is defined as a load circuit.
Find the average power spent by the load circuit?
2) 9.2Three - 25 KVA single-phase transformers are connected in delta – delta. One of the transformers has been defected. What is the maximum real power that the transformer bank can deliver at a power factor of 0.8?
Chapter 28 Solutions
Delmar's Standard Textbook Of Electricity
Ch. 28 - How many transformers are needed to make an...Ch. 28 - Two transformers rated at 100 kVA each are...Ch. 28 - How does the NEC specify that the high leg of a...Ch. 28 - An open-delta three-phase transformer system has...Ch. 28 - If a single-phase load is connected across the two...Ch. 28 - A three-phase transformer connection has a...Ch. 28 - A three-phase transformer connection has a...Ch. 28 - A three-phase transformer bank has the secondary...Ch. 28 - A three-phase transformer bank has the primary and...Ch. 28 - Referring to the transformer connection in...
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- Two 300-VA parallel-connected transformers can supply a maximum load of a. 150 VA b. 300 VA c. 450 VA d. 600 VAarrow_forwardQuestion 6 What is phase angle of voltage induced in primary and secondary windings of transformers due to mutual flux? Same Opposite Zero None of option A Moving to another question will save this response. AR e IT:7arrow_forwardIn the circuit in Figure 2, the capacitor connected to the a-b terminals of the transformer anda circuit consisting of resistance is defined as a load circuit. a)Find the average power spent by the load circuit? b) How much of the average power calculated in a) by the resistance in the load circuit and how muchspent by the capacitor? Comment on the results obtained?arrow_forward
- If you have 3-phase power and you need to step down (or up) in 3-phase voltage, how many single-phase transformers are needed? Explain.arrow_forwardExplain the efficiency of increasing the electrical power system of connecting transformers in parallelarrow_forwardShow how you would parallel connect the transformers to the source and the load in Figure 1 above. Windings 1 to 2, 3 to 4, and 5 to 6 are rated for 2.4 kV ac and windings 7 to 8, 9 to 10, and 11 to 12 are rated for 400 Vac. Upload a drawing/sketch showing the connections.arrow_forward
- 6. The figure below shows a single-line-diagram of part of a power system. For each transformer in the diagram state a suitable connection method, giving reasons for your suggested connection method. G1 G1 800MW 200MW 15kV 10kV T1-T4 88 T5-T6 250MVA each 125MVA each 330/15kV 88/10kV Line 1 Line 2 T7-T8 100MVA each 330/88kV T9 T10-T11 50MVA 50MVA each 88/66kV 88/11kV T12 2MVA 11/0.4kV Singe-phase loadsarrow_forwardWhat is the benefit of electrical transformers if there is a load and if there is no load?arrow_forwardTwo identical 460/230-V transformers are connected in parallel to a common load with impedance 10 + j6 ohms. The series impedance of the transformers referred to the secondary is 1.5 +j3 ohms. What is the current drawn by the load from the transformers if the voltage across it is 230 V?arrow_forward
- Three 20-kVA, 24000/277-V distribution transformers are connected in A-Y. The open-circuit test was performed on the low voltage side of this transformer bank, and the following data were recorded: Viine, OC = 480 V ljine, OC = 4.1 A P3p, Oc = 945 W The open-circuit test was performed on the low voltage side of this transformer bank, and the following data were recorded: Viine, sc = 1400 V line, SC = 1.8 A P39. SC = 912 W What is the magnetization reactance of this transformer, XM, in pu?arrow_forwardTRUE or FALSE: If two identical transformers are connected in parallel and not connected to any load, there will be no current that will circulate at the secondary windings.arrow_forwardiers? Explain. REVIEW QUESTIONS 1. Show how you would parallel connect the transformers to the source and the load in Figure 6-2. Windings 1 to 2 and 3 to 4 are rated for 2.4 kV ac and windings 5 to 6 and 7 to 8 are rated for 400 V ac. C. SOURCE R 2400V Figure 6-2. 2. The efficiency of a transformer which supplies a pure capacitive load isarrow_forward
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