Q1) I. A 100 kVA, three-phase ideal transformer has 4950 turns on the primary and 180 turns on the secondary winding. The primary is connected to 11000-volt. Calculate: Power Loss ,Secondary e. m. f., maximum flux in the core, Primary and Secondary currents on full-load.

Q1) I. A 100 kVA, three-phase ideal transformer has 4950 turns on the primary and 180 turns on the secondary winding. The primary is connected to 11000-volt. Calculate: Power Loss ,Secondary e. m. f., maximum flux in the core, Primary and Secondary currents on full-load.

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 3.28MCQ

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Concept explainers

Three-Phase Transformers

Three-segment transformers are a type of transformer used to transform voltages of electrical systems into three ranges. Two type transformers are shell-type transformer and core type transformer. In brief, it could be described because of the exquisite kinds of configurations.

Transformer

Ever since electricity has been created, people have started using it in its entirety. We see many types of Transformers in the neighborhoods. Some are smaller in size and some are very large. They are used according to their requirements. Many of us have seen the electrical transformer but they do not know what work they are engaged in.

Question

Q1) I. A 100 kVA, three-phase ideal transformer has 4950
turns on the primary and 180 turns on the secondary winding.
The primary is connected to 11000-volt. Calculate: Power Loss
, Secondary e. m. f., maximum flux in the core, Primary and
Secondary currents on full-load.

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Q1) I. A 100 kVA, three-phase ideal transformer has 4950 turns on the pr imary and 180 turns on the secondary winding. The primary is connected to 11000-volt. Calculate: Power Loss , Secondary e. m. f., Secondary currents on full-load. max imum flux in the core , Primary and I. What' s the effect of (Q) on the power transformer when becomes (zero), and why? II. A balanced star-connected load of (4 + j3) 2 per phase is connected to a balanced 3-phase 380 V supply. Find the Tine current, power factor, power and total volt-amperes .
10. In a transformer, the leakage flux of each wind- ing is proportional to the current in that winding because (a) Ohm's law applies to magnetic circuits (b) leakage paths do not saturate (c) the two windings are electrically isolated (d) mutual flux is confined to the core. 11. In a two-winding transformer, the e.m.f.per turn in secondary winding is always.........the induced e.m.f. power turn in primary. (a) equal to K times (b) equal to 1/K times (c) equal to (d) greater than. 12. In relation to a transformer, the ratio 20: 1 indi- cates that (a) there are 20 turns on primary one turn on secondary (b) secondary voltage is 1/20th of primary voltage (c) primary current is 20 times greater than the secondary current. (d) for every 20 turns on primary, there is one turn on secondary.
BListen Tron Joss in a transformer: Cais dependent on load current. b) is a function of the resistance of the primary and the secondary windings. Cis a function of eddy currents and hysteresis effects in the transformer core. d) ) can be reduced by ¼ by reducing the current by 2.
1.a. For performing dielectric-strength tests on insulating materials, two transformers are connected in aA. parallel combination.B. cascade arrangement.C. polyphase arrangement. 1.b. In large power transformers, the unequal voltage distribution caused by voltage surges in the winding isprevented by the use ofA. static shields.B. series capacitors.c. low-voltage arresters.
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