Determine the necessary transformer turn ratio for transferring maximum powerto a 160 load from a source that has an output impedance of 10 kQ. Also calculatethe voltage across the load if the terminal voltage of the source is 10V r. m. s.Sol : For maximum power transfer, the impedance of the primary should be equalto the output impedance of the source.

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Answered: Determine the necessary transformer…

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

Chapter6: Power Flows

Section: Chapter Questions

Problem 6.61P

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For an ideal 2-winding transformer, an impedance Z2 connected across winding 2 (secondary) is referred to winding 1 (primary) by multiplying Z2 by (a) The turns ratio (N1/N2) (b) The square of the turns ratio (N1/N2)2 (c) The cubed turns ratio (N1/N2)3
(a) An ideal single-phase two-winding transformer with turns ratio at=N1/N2 is connected with a series impedance Z2 across winding 2. If one wants to replace Z2, with a series impedance Z1 across winding 1 and keep the terminal behavior of the two circuits to be identical, find Z1 in terms of Z2. (b) Would the above result be true if instead of a series impedance there is a shunt impedance? (c) Can one refer a ladder network on the secondary (2) side to the primary (1) side simply by multiplying every impedance byat2 ?
For an ideal transformer, the efficiency is (a) 0 (b) 100 (c) 50
A three phase power transformer having a line voltage ratio of 400 V to 33 kV is connected in star-delta. The C.T.s on 400 V side have current ratio as 1000/5. What must be the C.T. ratio on 33 kV side. Assume current on 400 V side of transformer to be 1000 A. C.T. secondaries in delta p 5A oooo oooo 5√3 A -0000 0000 0000 0000 Star-delta transformer 0000 5√3 A vooo னள். m reeee p C.T. secondaries in star 5√3 A 0000
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primary of a certain transformer takes 1 a at a power factor of 0.4 when it is connected acrossa 200-v, 50-hz supply and the secondary is on open circuit. the number of turns on the primary istwice that on the secondary. a load taking 50 a at a lagging power factor of 0.8 is now connectedacross the secondary. what is now the value of primary current ?
5. A power-supply transformer has a secondary voltage if the primary is connected to a 120 V rms source? 6. Determine the peak and average power delivered to RL in figure. turns ratio of 5:1. What is the 2:1 120 V rms 220 N ell lelll
The high-voltage side of a step-down transformerhas 800 turns, and the low-voltage side has 100 turns. A voltage of 240 VAC is applied to the high side, andthe load impedance is 3Ω (low side). Finda. The secondary voltage and current.b. The primary current.c. The primary input impedance from the ratio ofprimary voltage to current.d. The primary input impedance.
A 100 Kva transformer has 400 turns on the primary and 80 turns on the secondary. The primary and secondary resistances are 0.3 ohm and 0.01 ohm respectively , and the corresponding leakage reactances are 1.1 ohms and 0.035 ohm respectively. The supply voltage is 2200 V. The % VR and the secondary terminal voltage for full load 0.8 pf leading are: -1.44 and 330.29 V O 1.54 and 4467.7 V -1.54 and 446.77 V
7 Given Zc-j309 , R₁ = 390 , RL = 6401 2 and a = 0.39, what is the magnitude of the source voltage Vs (in V rms) in the primary of the ideal transformer? Vs R₁ www 1:a 40 Zc Zc Answer: Use up to 2 digits after the decimal point if necessary in your answer below. Tune hor RL VL=28020 Vms

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