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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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?
3. Two T-connected transformers are used to supply a balanced load of 100 kVA at 400 V from a balanced 11 kV, 3-phase supply. Determine (a) voltage and current rating of each coil (b) kVA rating of the main and teaser transformer.
The _____________________ of transformers are neglected to draw the reactance diagram.
a-Shunt branches
b -Series conductance
c-Series reactance
d-Static Loads
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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- Does an open- operation, the kVA rating compared to that of the original thr-phase bank is (a) 2/3 (b) 58 (c) 1arrow_forwardThree single phase transformers rated 25 KVA each are connected in delta delta to supply a balanced load of 75 KVA. One transformer is removed for repair, what is the KVA of each remaining transformer? A. 43.3 B. 50 C. 57.7 D. 34.3arrow_forwardThree single-phase transformers are connected into a three-phase bank. The primary is connected as a wye, and the secondary is connected as a delta. If 4160 V is connected to the primary, what is the phase voltage?arrow_forward
- Two 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_forwardTwo single-phase transformers in parallel supply a load of 500 A at 0.8 pf lagging and at 400 V. Their equivalent impedances referred to secondary windings are (2 + j3) ohms and (2.5 + j5) ohms. Compute the kVA load on each transformer.arrow_forwardTwo single-phase transformers having equal turns ratio supply, in parallel asecondary load of 750 A at 0.80 p.f. lagging. For each transformer the secondary are(0.10+j0.20) ohm and (0.05+j0.40) ohm, respectively. Determine the output currentfor each transformer.arrow_forward
- 10.a. Most of the power transformers that you will find in commercial and industrial applications are either three-phase orA. two-phaseB. single-phaseC. zero-phaseD. four-phase10.b. The percent regulation for a transformer whose secondary voltage goes from 150 V at no load to 140 V at full load isA. 10.7%B. 9.3%C. 6.7%D. 7.1%10.c. Three single-phase transformers are connected in ∆ - ∆. Each of these transformers has a secondary phase current of 10 A. The value of the secondary line current isA. 578 AB. 17.3 AC. 57.8 AD. 1.73 Aarrow_forwardIn two winding unloaded transformer, the flux linking the primary and secondary winding are 10mwb and 8 mWb respectively. What is the coupling coefficient?answer asaparrow_forwardThree single phase transformers are connected in a Delta-Delta configuration. Each transformer is rated 34kV/66kV. The transformers are connected to a 3 phase 34kV (L-L) supply and the balanced three phase load is 854KVA. What is the current magnitude in the secondary winding of each transformer? Explain the steps too pleasearrow_forward
- Draw three transformers for each of the different three-phase connections. That is, draw three transformers and then make the connection, eg star-star, then redraw three transformers and make another three-phase connection, and so on until all four combinations of three-phase connections are made.arrow_forwarda. Write a table consists of well- known power capacity of distribution transformers . b . Write a table consists of standard magnitudes of turn-ratios of current transformers . C.Discuss the above tables .arrow_forwardWhat are the methods of connections in the primary and secondary sides of 65 kVA, 11000 V/415 V, 50 Hz, 3-phase transformer states vector: Dyn. The winding connection is depicted in the below image.arrow_forward
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