A three phase stator is shown below. The positive polarity of the currents is shown in the image. b The windings are fed with the following balanced three phase currents: la-lmcos(wt) Ib-Imcos(wt-100°) Ic=Imcos(wt+100°) a) Where would you label the positive axes of all three phase windings in the image? b) Draw the magnetic field vectors produced by each single phase, and the total rotating magnetic field for wt = 0° and wt = 90° in the following figures. c) Is the rotating magnetic field clockwise or counter-clockwise?

A three phase stator is shown below. The positive polarity of the currents is shown in the image. b The windings are fed with the following balanced three phase currents: la-lmcos(wt) Ib-Imcos(wt-100°) Ic=Imcos(wt+100°) a) Where would you label the positive axes of all three phase windings in the image? b) Draw the magnetic field vectors produced by each single phase, and the total rotating magnetic field for wt = 0° and wt = 90° in the following figures. c) Is the rotating magnetic field clockwise or counter-clockwise?

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 3.1MCQ: The Ohms law for the magnetic circuit states that the net magnetomotive force (mmf) equals the...

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A three phase stator is shown below. The positive polarity of the currents is shown in the image. The windings are fed with the following balanced three phase currents: la-lmcos(wt) Ib-Imcos(wt-90°) Ic=Imcos(wt+90°) a) Where would you label the positive axes of all three phase windings in the image? b) Draw the magnetic field vectors produced by each single phase, and the total rotating magnetic field for wt = 0° and wt = 90° in the following figures. c) Is the rotating magnetic field clockwise or counter-clockwise?
A ferromagnetic core is shown in Figure PI-2. The depth of the core is 5 cm. The other dimensions of the core are as shown in the figure. Find the value of the current that will produce a flux of 0.005 Wb. With this current, what is the flux density at the top of the core? What is the flux density at the right side of the core? Assume that the relative permeability of the core is 1000. -10 cm- - 20 cm- 15 cm 400 turns 15 cm 15 cm Core depth 5 cm
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AC Machinery Fundamentals A three-phase delta-connected six-pole winding is installed in 36 slots on a stator. There are 150 turns of wire in each slot of the windings. All coils in each phase are connected in series. The flux per pole in the machine is 0.060 Wb, and the speed of rotation of the magnetic field is 1000 r/min. What are the resulting phase and terminal voltages?
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E-06, PC-05. Why are the iron cores of most induction coils laminated? To increase the core permeability. To reduce the core reluctance. To reduce the effects of eddy currents. Click Save and Submit to save and submit. Click Save All Answers to save all answers. MacBook Air 吕0 F2 F3 F4 F5 $4 & 4 5 O 6 7 7 W .. E R .... S » D S F G # 3
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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?
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