1 1. Three non-inductive resistances, each of 100 Q, are connected in star to a three-phase, abc-sequence, 440-V supply. Three inductive coils, each of reactance100 Q connected in delta are also connected to the supply. Three wattmetersare connected as in Example 2.1.18. Calculate the reading indicated by eachwattmeter. 8:13Module 2 Unit 1 Anal...Q, = V3E¸I¸ sin 0̟= V3WEXAMPLE 2.1.18Calculate the average power indicated by each wattmeter and the total powerconsumed by the load. Phase sequence is EAB-EBc-ECA. Line-to-line voltage is 100 V.leellAaw,-j10nj102llbW2lellW3Property of and for the exclusive use of SLU. Reproduction, storing in a retrieval system, distributing, uploading or posting online, or transmitting in any form or by anymeans, electronic, mechanical, photocopying, recording, or otherwise of any part of this document, without the prior written permission of SLU, is strictly prohibited.237MODULE 2Polyphase CircuitsSolutionW = EI, cos 0W, = EI, cos 0̟/w Ea and IIN E and IW, = E I cos 0IN Ea and IeUsing Ean as the reference phasor, the phase voltages are:E =10020° v100E2 - 120° V100E, =Z120° vThe line voltages are:E = 100230° vE = 1002 - 90° vE, = 1002150° vBy nodal method, we determine the line currents.Aa-j10nBj102llbN► 102Property of and for the exclusive use of SLU. Reproduction, storing in a retrieval system, distributing, uploading or posting online, or transmitting in any form or by anymeans, electronic, mechanical, photocopying, recording, or otherwise of any part of this document, without the prior written permission of SLU, is strictly prohibited.238NERSIT

Given,Three non-inductive resistances are connected in star to a three- phase, abc-sequence.andThree…

1. Three non-inductive resistances, each of 100 Q, are connected in star to a three- phase, abc-sequence, 440-V supply. Three inductive coils, each of reactance 100 Q connected in delta are also connected to the supply. Three wattmeters are connected as in Example 2.1.18. Calculate the reading indicated by each wattmeter.

1. Three non-inductive resistances, each of 100 Q, are connected in star to a three- phase, abc-sequence, 440-V supply. Three inductive coils, each of reactance 100 Q connected in delta are also connected to the supply. Three wattmeters are connected as in Example 2.1.18. Calculate the reading indicated by each wattmeter.

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 3.7MCQ: Consider Figure 3.5. Match the following, those on the left to those on the right. (i) Im (a)...

See similar textbooks

Similar questions

SNINW- The incandescent bulbs rated respectively as P, and P, for operation at a specified mains voltage are connected in series across the mains as shown in the above figure. Then the total power supplied by the mains to the two bulbs are P, A V P2 PP2 (a) P,+ P2 (b) p? + P + P (c) (P,+ P2) (d) P, xP,
(b) Differentiate between single phase and three phase alternating current (A.C) supply for the following aspects with adequate comparisons and sketches: (i) Generation of single phase and three phase e.m.f.s (ii) Sine waveforms(iii) Advantages or disadvantages of both phases
b) A power station has the following daily load cycle as Figure Q1(b) below: Time in Hours 6-8 8-12 12-16 16 20 20-24| 24–6 Load in MW 90 40 60 20 20 20 Figure Q1(b): Daily Load Cycle i) Plot the load curve i) Plot the load duration curve i) Determine energy generated per day
50. A series resistance-capacitance (R-C) circuit is connected to 230-volt, 50 cycle AC source. The current through the resistor is 45.45 A and the power taken by the circuit is 5,000 watts. Compute the following: a. Ohmic value of the resistor b. Capacitive reactance E. capacitance in microfarad
1.3 A 240 volts 50 Hz single phase ac source supplies a series load consisting of a resistor (40 ohms), a reactor (127.324 mH) and a capacitor (318.3 µF). Suppose that the frequency of the source can be varied at will. 1.3.1 Determine the maximum load current. 1.3.2 Determine the source frequency for maximum load current. 1.3.3 What is the name of this frequency? 1.3.4 Determine the load power factor. 1.3.5 What is the name of the source
A wattmeter with a current coil connected to phase A, and the voltage between phase A and C gives a reading of 280 kW in a three-wire three-phase system. Three ampmeters arranged lines A, B and C indicate respectively 140, 110 and 130 Amps. The voltage of line measured by a voltmeter gives 2300 volts between any pair of lines. Make the corresponding diagram, indicating the connection of the instruments to finally calculate the active power of the system
Q2/ Find Yous for the power system all reactance on a common base. Bus 3 j0.25 j0.10 j0.25 Bus 2 j0.125 Bus 1 j0.40 j0.20 j0.10 Bus 4
Figure (El1) 12- For the electric circuit shown in the figure (E12), determine the value unar of (R) if the current trough the branch AB is zero and the total current is 1A. Note that all the values of resistors are in ohm. 1.5 B. R 10V Figure (E12) d by
Determine the maximum instantaneous positive voltage drop across R in the series AC/DC circult below. Vrms = 18.3 V Vdc = 17 V Enter your results in volts. Do not type the unit. Vrms R 1.0 kN Vdc .
plase answer five a quesion option corrctly 9.In AC circuits, power consumed is A.it depends on the supply voltage B.product of voltage and current C.it depends on the power factor (p.f.) of the circuit in addition to voltage and current D.it depends on the magnitude of the circuit current 10A potential transformer is a A.transformer used with an AC ammeter B.transformer used with an AC voltmeter C.transformer used with a DC voltmeter D.transformer used with a DC ammeter 11. Define Per Unit Quantity A/ Xp.u = x base / x actual per unit B/ Xp.u = X actual / x base per unit C/ Xp.u = x actual / x unit per unit 12./ VS= 1200<0º V ZL= 50 + j60 ohm ZS= j25ohm By taking Zbase = 100 ohm, find Vs (p.u), Zs(p.u), ZL(p.u) A. Vs (p.u) = 1 < 00 p.u Zs(p.u) = j0.20 p.u ZL(p.u) = 66.42<390 p.u B. Vs (p.u) = 1 < 00 p.u Zs(p.u) = j0.25 p.u ZL(p.u) = 42.96<730 p. C. Vs (p.u) = 1 < 00 p.u Zs(p.u) = j0.25 p.u ZL(p.u) = 0.781<50.20 p.u 13. Which of…
In the circuit in Figure 2, the capacitor connected to the a-b terminals of the transformer anda circuit consisting of resistance is defined as a load circuit. a)Find the average power spent by the load circuit? b) How much of the average power calculated in a) by the resistance in the load circuit and how muchspent by the capacitor? Comment on the results obtained?
1. A resistor, in series with a 138-microfarad capacitor, is connected to a 60-cycle source. If the voltage drop across the capacitor is 115 volts and the power taken by the circuit is 922 watts, calculate (a) the circuit current, (b) the ohmic value of the resistor, (c) the line voltage, (d) the circuit power factor. Please show complete solution and the circuit diagram. Please round off answers up to the 3rd decimal place. Thank you!