C 2. Comparing the transformer cores of core-form and shell-form transformers shows that the A. shell form is used exclusively in small low-voltage transformers. BR B. core form allows more flexible coil grouping.< C. shell form provides lower reactance without increasing the transformer size. B2/AS CM D. core form makes possible wider coils and better oil circulation. -

C 2. Comparing the transformer cores of core-form and shell-form transformers shows that the A. shell form is used exclusively in small low-voltage transformers. BR B. core form allows more flexible coil grouping.< C. shell form provides lower reactance without increasing the transformer size. B2/AS CM D. core form makes possible wider coils and better oil circulation. -

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter3: Power Transformers

Section: Chapter Questions

Problem 3.11MCQ: For a short-circuit test on a 2-winding transformer, with one winding shorted, can you apply the...

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In developing per-unit circuits of systems such as the one shown in Figure 3.10. when moving across a transformer, the voltage base is changed in proportion to the transformer voltage ratings. (a) True (b) False
If we increase the load than core loss and copper loss will... Decrease Increase Remain same
P2-Draw the equivalent circuit of a single-phase transformer and explain how the core losses are almost invariant to the load (current). How do they depend on the terminal voltages of the transformer? Also, using the equivalent circuit explain how the copper losses depend on the load current.
What conclusions we come up with after doing open circuit test on single phase transformer.
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The eddy current and hysteresis losses of a 4400-V, 60-Hz, 10 distribution transformer are 280 W and 560 W, respectively. Determine the core loss when the transformer is connected across a 4600-V, 50-Hz source. Your answer
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A transformer has primary and secondary turns of 1250 and 125 respectively. It has core cross-sectionof 36 cm2 and its rms flux density is to be limited to 1.4 T (to prevent core saturation). Whatmaximum 50 Hz voltage can be applied on the primary side and the corresponding open-circuitsecondary voltage?The core has a mean length of 150 cm and its relative permeability can be assumed to be 8000. Whatwould be the rms exciting current when the transformer’s primary winding is excited at a voltage ascalculated above? Also calculate the magnetizing susceptance as seen from primary and secondarysides.If the transformer were to be excited at 60 Hz, 1. What should be the maximum primary voltage for thecore flux density limit not to be exceeded? 2. What would be the magnetizing susceptance as seen oneach side in this case?
A method for determining the equivalent network of a nonideal transformer consists of two tests: the open-circuit test and the short-circuit test. The open-circuit test, shown in figure (a), is usually done by applying rated voltage to the primary side of the transformer while leaving the secondary side open. The current into the primary side is measured, as is the power dissipated. The short-circuit test, shown in figure (b), is performed by increasing the primary voltage until rated current is going into the transformer while the secondary side is short-circuited. The current into the transformer, the applied voltage, and the power dissipated are measured. The equivalent circuit of a transformer is shown in figure (c), where rw and Lw represent the winding resistance and inductance, respectively, and rc and Lc represent the losses in the core of the transformer and the inductance of the core. The ideal transformer is also included in the model. With the open-circuit test, we may…
3. The low-voltage winding of a 3000/200-V, 50-Hz, a single-phase transformer has 80 turns and is installed on a core with an efficient cross-sectional area of 150 cmz. Make a calculation on: a. the high-voltage winding's number of turns b. the value of the maximum flux density in the core
3. A single phase, 50-Hz transformer has 80 turns on the primary winding and 400 turns on the secondary winding. The net cross-sectional area of the core is 200 cm. If the primary winding is connected to 240-V, 50-Hz supply, determine (a) the emf induced in the secondary winding, and (b) the maximum flux density in the core 2000 1
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