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Where did they get -120 degrees and -240 degrees?

Where did they get -120 degrees and -240 degrees?

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
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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Question
Where did they get -120 degrees and -240 degrees?
Rol Step 2 given that R -2y = 10 +3ja 2x8 = 12+jo₂₁ ZBR = 8 +35_22_ V₁ = 440V, f = 50HZ W₁ m W2 Y B Here, VRY = 1440L0° VYB = 440-120° VBR = 4401 - 240° 2PY ZYB 223
Transcribed Image Text:Rol Step 2 given that R -2y = 10 +3ja 2x8 = 12+jo₂₁ ZBR = 8 +35_22_ V₁ = 440V, f = 50HZ W₁ m W2 Y B Here, VRY = 1440L0° VYB = 440-120° VBR = 4401 - 240° 2PY ZYB 223
(b) An unbalanced delta connected load consisting of the phase impedances Zar (10+33) 52, Zva (12+10) 2 and Zax (8+13) 2 is connected to a 3-phase, 440 V, 50 Hz supply. Draw the circuit diagram including the implementation of a 2 wattmeter power measurement. Using the information above: Calculate the 3 load phase currents (JRY. IYB and Jan.). (ii) Draw a scaled phasor diagram indicating all phase and line voltages and the three load phase currents. Using the scaled phasor diagram or otherwise determine the 3 line currents (/. ly and IB). (iii)
Transcribed Image Text:(b) An unbalanced delta connected load consisting of the phase impedances Zar (10+33) 52, Zva (12+10) 2 and Zax (8+13) 2 is connected to a 3-phase, 440 V, 50 Hz supply. Draw the circuit diagram including the implementation of a 2 wattmeter power measurement. Using the information above: Calculate the 3 load phase currents (JRY. IYB and Jan.). (ii) Draw a scaled phasor diagram indicating all phase and line voltages and the three load phase currents. Using the scaled phasor diagram or otherwise determine the 3 line currents (/. ly and IB). (iii)
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