TEXTBOOK OF ELECTRICITY W/MINDTAP >BI<
6th Edition
ISBN: 9781305812505
Author: Herman
Publisher: Cengage Learning
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Textbook Question
Chapter 29, Problem 1PP
Refer to transformer shown in Figure 29–14 and find all the missing values.
| Primary | Secondary | Load |
| EP _______ | EP ________ | EP ________ |
| IP ________ | IP _________ | IP ________ |
| EL 4160 V | EL 440 V | EL ________ |
| IL ________ | IL _________ | IL ________ |
| Ratio | Z = 3.5 Ω |
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The copper loss of a certain transformer at full-load is 220W. Then the copper loss at half full-load will be__________________.
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Refer to the transformer shown in Figure 5-13 to answer the following questions.
1. Assume that a voltage of 208 volts is applied across terminals B and E. How much voltage is across each of the following terminals? A–B ____ A–C ____ A–D ____ A–E ____ B–C ____ B–D ____B–E ____ C–D ____ C–E ____ D–E ____
2.Assume a voltage of 120 volts is connected across terminals B and E, and that a load impedance of 20 V is connected across terminals A and C. What is the secondary and primary current? IP ____ IS ____
3.What is the turns ratio of the winding between points B and E as compared to the winding between points D and E?
4.Assume that a voltage of 480 volts is connected across terminals A and E. What is the voltage across terminals C and D?
5.The transformer shown in Figure 5-13 is supplying 325-volt amperes to a load. The primary voltage is 240 volts. What is the primary current?
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What is the connection of this transformer bank? Note: answer must be all caps with -
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XI
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| xo
Chapter 29 Solutions
TEXTBOOK OF ELECTRICITY W/MINDTAP >BI<
Ch. 29 - How many transformers are needed to make an...Ch. 29 - Two transformers rated at 100 kVA each are...Ch. 29 - How does the NEC specify that the high leg of a...Ch. 29 - An open-delta three-phase transformer system has...Ch. 29 - If a single-phase load is connected across the two...Ch. 29 - A three-phase transformer connection has a...Ch. 29 - A three-phase transformer connection has a...Ch. 29 - A three-phase transformer bank has the secondary...Ch. 29 - A three-phase transformer bank has the primary and...Ch. 29 - Referring to the transformer connection in...
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- Belonging to a phase measured from a 220/48 V phase transformer, no-load (no load) operation and short-circuit test. values are given in the table below. Low voltage by applying rated voltage to the high voltage (primary) winding. voltage (secondary) winding ends were left unloaded and the results of the no-load operation test were obtained. low voltage By applying nominal current to the windings, the high voltage windings are short-circuited and short-circuit test results are obtained. has been done. In addition, the transformer with 5 V direct voltage applied to the high voltage winding is 2.2 A direct current. attracts. Calculate all equivalent circuit elements moved to the high voltage side. Boşta çalışma testi Gerilim 220 V Güç 80 W Akım 0,44 A Kısa devre testi Gerilim 12 V Güç Akım 65 W 16,1 Aarrow_forwardWrite in Briefly about circuit breaker, current transformer and voltage transformerarrow_forward: In the figure QUESTION-2 ( given left, a high voltage AC testing transformer is shown. Please write the names of each numbered section of the trafo and briefly describe 2 the role of each 5 component.arrow_forward
- 15. Primary winding of transformer is made-up of __________________________ material. a. insulated copper conductor b. Cold Rolled Grain Oriented (CRGO) conductor c. Cold Rolled Grain Oriented (CRGO) Silicon Steel d. insulated CRGO conductorarrow_forwardIn a typical unit substation the majority of the connections to ground are made in the_. A. High- voltage section B. Transformer section C. low- voltage section D. None of the above.arrow_forwardFill in the blanks with a suitable describing for the following 1. Active component of no load current of transformer is _____________ 2. The resistance of series field windings is __________ and it's have ____________ number of turns 3. Leakage flux of transformer is ___________ 4. Starting torque is __________ in D.C. series motor 5. PID controller is _________arrow_forward
- h.1. In an alternating-current system, the maximum size for a copper grounding electrode conductor isA. 250 kcmil.B. 3/0.C. 500 kcmil.D. 4/0. h.2. The figure shows a fault condition in an ungrounded electrical system. Which of the following will occurbecause of the fault in this system?A. Only the overcurrent protector at Point A will trip open.B. The ground fault will heavily damage the service.C. Nothing will happen until a second ground fault occurs.D. The overcurrent protection will trip, shutting off all the line side power.arrow_forwardLOCAL 5652 UNION LABEL USW UNITED STEELWORKERS 6. Which one of the following types of construction is used for potential transformers? A. Window-type B. Wound-type C. Bushing-type D. Bar-typearrow_forwardA transformer takes a current of 0.9 A and power absorbed 82 W, when its primary is connected to a 240V, 50Hz supply under secondary is open circuited. No load power factor cos ∅ is____________________________________. (a) 0.379 (b) 0.74 (c) 0.2 (d) 0.9arrow_forward
- Seconday winding of transformer is made-up of __________________________ material. insulated copper conductor Cold Rolled Grain Oriented (CRGO) Silicon Steel insulated CRGO conductor Cold Rolled Grain Oriented (CRGO) conductorarrow_forward- Transformers and Special Locations 7.a. Dry-type transformers are available in what configuration(s)?A. Single-phase or auto-phaseB. Poly-phase onlyC. Single- or poly-phaseD. Single-phase only7.b. How many separate and distinct electrical systems does an essential electrical system consist of?A. FiveB. ThreeC. FourD. Sixarrow_forward2. Two different transformers details are tabulated below. Calculate the missed values in the table. Secondary terminal voltage of the second transformer is 487.5V when loaded. Determine the regulation of the transformer. N, | N2 V: 1 1 Transformer V, Flux Area L(60000 VA SOHZ) ? 100 100v ? ? 25cm 1.6KV II.(6000VA 50HZ 100 100 500 ? 0.04505Wb flux density 1.50T)arrow_forward
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