Introductory Circuit Analysis
13th Edition
ISBN: 9780133923919
Author: Boylestad, Robert L.
Publisher: Pearson Education
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Chapter 23, Problem 26P
For the multiple-load transformer in Fig. 23.43, where
- Determine the load voltages and currents.
- Calculate Z1.
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The parameters of a 1000/250V, 50HZ single phase transformer are: R1=1.3 N, X1=2.8 N, R2=0.11 N, X2=0.2 N, R,=250 N, X,=900 N. If the load voltage is 220V, load power is 10kW, and load power factor is 0.8 lagging. Find by using the exact equivalent circuit: (i) Input current, (ii) The input voltage and power factor, (iii) The magnetizing current, (iv) The copper losses, (v) The voltage regulation.
A 4800- Vrms transmission line feeds a distribution transformer with 1200 turns on the primary and 28 turns on the secondary . When a 10-Ohm load is connected across the secondary . Find ?
a ) the secondary voltage
A 6.9 kV/600 V, multi-tap, single-phase distribution transformer is connected to the far end of a distribution line for which the rear end voltage is maintained at 6.9 kV. The equivalent impedance of the transformer referred to low voltage side is 0.05 + j0.25 Ω per phase. The impedance of each line is 1 + j2 Ω. It is required to maintain a terminal voltage of 600 V when the line current of 300 A at 80% pf lagging is delivered to the load. What approximate percentage tapping is required in the primary side? Neglect the changes in impedance due to changes in turns ratio.
A. 94 %
B. 92 %
C. 90 %
D. 88 %
Chapter 23 Solutions
Introductory Circuit Analysis
Ch. 23 - For the air-core transformer in Fig. 23.57: Find...Ch. 23 - Repeat Problem 1 if k is changed to 1. Repeat...Ch. 23 - RepeatProblem1fork=0.3,NP=300turns,andNS=25turns.Ch. 23 - For the iron-core transformer (k = 1) in Fig....Ch. 23 - RepeatProblem4forNP=240andNS=30.Ch. 23 - Find the applied voltage of an iron-core...Ch. 23 - If the maximum flux passing through the core of...Ch. 23 - For the iron-core transformer in Fig. 23.59: Find...Ch. 23 - Find the input impedance for the iron-core...Ch. 23 - Find the voltage Vg, and the current Ip if the...
Ch. 23 - If VL=240V,ZL=20resistor,Ip=0.05AandNs=50 find the...Ch. 23 - If Np400,Ns=1200andVg=100V,findthemagnitudeofIp...Ch. 23 - For the circuit in Fig. 23.60, find the...Ch. 23 - For the transformer in Fig. 23.61, determine the...Ch. 23 - For the transformer in Fig. 23.61, if the...Ch. 23 - Prob. 16PCh. 23 - Discuss in your own words the frequency...Ch. 23 - Determine the total inductance of the series coils...Ch. 23 - Determine the total inductance of the series coils...Ch. 23 - Determine the total inductance of the series coils...Ch. 23 - Write the mesh equations for the network in Fig....Ch. 23 - Determine the input impedance to the air-core...Ch. 23 - An ideal transformer is rated...Ch. 23 - Determine the primary and secondary voltages and...Ch. 23 - For the center-tapped transformer in Fig. 23.42,...Ch. 23 - For the multiple-load transformer in Fig. 23.43,...Ch. 23 - Prob. 27PCh. 23 - Write the mesh equations for the network of Fig....Ch. 23 - Write the mesh equations for the network of Fig....Ch. 23 - A current transformer has a secondary with 250...Ch. 23 - Generate the schematic for the network in Fig....Ch. 23 - Prob. 32PCh. 23 - Using a transformer from the library find the load...
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