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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.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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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.
Transcribed Image Text: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.
8:13 Module 2 Unit 1 Anal... Q, = V3E¸I¸ sin 0̟ = V3W EXAMPLE 2.1.18 Calculate the average power indicated by each wattmeter and the total power consumed by the load. Phase sequence is EAB-EBc-ECA. Line-to-line voltage is 100 V. le ell A a w, -j10n j102 ll b W2 le ll W3 Property 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 any means, electronic, mechanical, photocopying, recording, or otherwise of any part of this document, without the prior written permission of SLU, is strictly prohibited. 237 MODULE 2 Polyphase Circuits Solution W = EI, cos 0 W, = EI, cos 0̟ /w Ea and I IN E and I W, = E I cos 0 IN Ea and Ie Using Ean as the reference phasor, the phase voltages are: E = 100 20° v 100 E 2 - 120° V 100 E, = Z120° v The line voltages are: E = 100230° v E = 1002 - 90° v E, = 1002150° v By nodal method, we determine the line currents. A a -j10n B j102 ll b N ► 102 Property 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 any means, electronic, mechanical, photocopying, recording, or otherwise of any part of this document, without the prior written permission of SLU, is strictly prohibited. 238 NERSIT
Transcribed Image Text:8:13 Module 2 Unit 1 Anal... Q, = V3E¸I¸ sin 0̟ = V3W EXAMPLE 2.1.18 Calculate the average power indicated by each wattmeter and the total power consumed by the load. Phase sequence is EAB-EBc-ECA. Line-to-line voltage is 100 V. le ell A a w, -j10n j102 ll b W2 le ll W3 Property 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 any means, electronic, mechanical, photocopying, recording, or otherwise of any part of this document, without the prior written permission of SLU, is strictly prohibited. 237 MODULE 2 Polyphase Circuits Solution W = EI, cos 0 W, = EI, cos 0̟ /w Ea and I IN E and I W, = E I cos 0 IN Ea and Ie Using Ean as the reference phasor, the phase voltages are: E = 100 20° v 100 E 2 - 120° V 100 E, = Z120° v The line voltages are: E = 100230° v E = 1002 - 90° v E, = 1002150° v By nodal method, we determine the line currents. A a -j10n B j102 ll b N ► 102 Property 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 any means, electronic, mechanical, photocopying, recording, or otherwise of any part of this document, without the prior written permission of SLU, is strictly prohibited. 238 NERSIT
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