Introductory Circuit Analysis
13th Edition
ISBN: 9780133923919
Author: Boylestad, Robert L.
Publisher: Pearson Education
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Chapter 23, Problem 11P
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A 4500/16000V, 1500 kVA, 50 Hz transformer has the following parameters: R1 = 0.03 Ω, R2 = 0.44 Ω, R0 = 1688 Ω X1 = 0.092 Ω, X2 = 1.34 Ω, X0 = 256 Ω The transformer is supplying full- load at power factor of 0.8 lagging. Using exact equivalent circuit, find the input curren
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secondary being open circuit. If the power absorbed is 72 watts, determine (a) the iron loss current,
(b) the power factor on no-load, and (c) the magnetizing current.
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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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- A transformer has 440 primary windings and 22 secondary windings. The potential difference across the primary coil is 100 V. The secondary coil is connected across a 125-ohm resistor. Find (a) secondary current (b) primary current. Hint: Use conservation of power. (c) effective load resistance of the SECONDARY COIL, which is connected across a 125 ohm resistor.arrow_forwardThe primary and secondary windings of a 500 kVA transformer have resistances of 0.44 Ω and 0.0027 Ω, respectively. The rated primary and secondary voltages are 11013 V and 473 V, respectively and the core loss is 2.9 kW. Assuming the power-factor of the load to be 0.8, calculate the output at which the efficiency is a maximum. Give your answer in kVA correct to 2 decimal places.arrow_forwardThe primary and secondary windings of a 40 kVA, 6600/250 V single-phase two-winding transformer have resistances of 10 Ω and 0.02 Ω, respectively. The leakage reactance of the transformer referred to the primary is 35 Ω. Calculate the percent full-load regulation at unity power-factor. Neglect the no-load current. Give your answer correct to three decimal placesarrow_forward
- A 200 KVA transformer has an efficiency of 98% at full load. If the maximum efficiency occurs at three quarters of full load, calculate the efficiency at half load. Assume p.f. of 0.8 at all loads. [ Ans: 97.9%]arrow_forward. For the iron-core transformer (k == 1) in Fig. 23.58: + E = 40 V √=60H/ N₁ = 20 HANN HA MARE, LA N. = 120 a. Find the magnitude of the induced voltage E. b. Find the maximum fluxarrow_forwardA 1000 VA, 230/115 V transformer has been tested with the following results:Open-circuit test Short-circuit testP WI AV Vocococ300.45230P WI AV Vscscsc42.38.719.1Find (i) the equivalent circuit parameters referred to the low-voltage side of the transformer,(ii) Full load voltage regulation at 0.85 power factor lagging load.arrow_forward
- Q29. A 800 kVA transformer has a primary winding resistance of 0.8Ω and a secondary winding resistance of 0.003 Ω. The iron loss is 2.8 kW and the primary and secondary voltages are 4.5kV and 310V respectively. If the power factor of the load is 0.84 determine the efficiency of the transformer for full loadarrow_forwardThe maximum efficiency at Full-load and Unity power factor of a 1-phase, 25 kVA, 2000/1000V, 50Hz transformer is 98%. Determine its efficiency at 1/4th of full loadarrow_forwarda 3.88/16 kV , 1427 kVA, 50 Hz transformer has the following parameters: R1 = 0.042 ; R2 = 0.37; RC = 1711 X1 = 0.083; X2 = 1.26 ; XM = 262 NB: units of all the above parameters (resistance & reactance) are in ohm The transformer is suppling full-load at a power factor of 0.82 lagging. Using the exact equivalent circuit of the real transformer, find the core loss power in kW.arrow_forward
- A 15-kVA, 2400/240-V, 60 Hz single phase transformer has the following equivalent circuit parameters:R1 = 2.5 Ω R2 = 0.025 Ω X1 = 7 Ω X2 = 0.07 ΩRc = 32 kΩ Xm = 11.5 kΩIf the transformer is supplying a 10-kW, 0.8 PF lagging load at rated voltage, calculate the primary voltageand current.arrow_forwardA 800 kVA transformer has a primary winding resistance of 0.8Ω and a secondary winding resistance of 0.003 Ω. The iron loss is 2.8 kW and the primary and secondary voltages are 4.5kV and 310V respectively. If the power factor of the load is 0.84 determine calculate the efficiency of the same transformer for one third of the loadarrow_forwardA 210 / 400V , 8KVA, 50Hz single-phase transformer has a copper loss of 155W at full load, unity power factor with an efficiency of 95%. Determine the output power and iron loss.arrow_forward
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