Q. No. 2. The line-to-line voltages at the terminals of a balanced load consisting of three 20 2 Y- connected resistors are 20020°, 1004255.5° and 2004151° V, as shown in Figure 2 below. (a) Find the line currents from the symmetrical components of the line voltages if the neutral of the load is not connected to earth (isolated). (b) Find the power expanded in three 20 Q resistors from the symmetrical components of currents and voltages. (c) Check your answer for power. 20 20 C Figure 2 for Q. No. 2. Three Y-connected 20 SN Resistors.

Q. No. 2. The line-to-line voltages at the terminals of a balanced load consisting of three 20 2 Y- connected resistors are 20020°, 1004255.5° and 2004151° V, as shown in Figure 2 below. (a) Find the line currents from the symmetrical components of the line voltages if the neutral of the load is not connected to earth (isolated). (b) Find the power expanded in three 20 Q resistors from the symmetrical components of currents and voltages. (c) Check your answer for power. 20 20 C Figure 2 for Q. No. 2. Three Y-connected 20 SN Resistors.

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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7. A 4157-Vms, three-phase supply is applied to a balanced Y-connected three-phase load consisting of three identical impedances of 48236.87° Q. Taking the phase to neutral voltage Van as reference, calculate a) The phasor currents in each line b) The total active and reactive power supplied to the load [50Z-36.87' A, 50Z-156.87° A, 50Z-276.87° A, 288 kW, 216 kvar]
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Referring to the circuit shown in Figure 1 below, solve the following problems: - i) Calculate the total impedance, ZT. ii) Determine the total current, Ir supplied by the generator iii) Determine the value of current at load impedance, I1, I2 and I3. iv) Calculate total real power, PT and reactive power, Qr supplied by the generator. v) Draw a power triangle of this circuit vi) Calculate the power factor of this circuit.
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(c) In the Y-A system shown in Figure Q2(c), the source is a positive sequence with VRN = 24020° V and phase impedance, Zp = (2 – j3) N. Determine; VRN R Zp VYN Y N Zp ZP VBN B Figure Q2(c) (i) All line voltages, VRY, VYB, and VBr-. (ii) All line currents, IR, Iy and Ig. (iii) Total real power absorbs by the loads.
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