Q4 (Unbalanced Delta)R12-j39+j0 Zt VANVay V=400VV,NVYNBNY8+j5VRY400230"IRY == 44.4230"920"ZRY4002-909.43432VYRIya =42.42-122"4004150°VaRIBR =ZaR= 32.2Z16412.42-14°Draw scaled phasor diagram to determine line currents IR, ly and la-lyBIRYVRY-lBRVRNw1Scale:1cm=10Aw2VRBVYN-IRYVyBMeasured from the scaled phasor diagram: IR = 71210°Ir = 842-137"Is = 442100°The total real power (W) in the three phase load can be calculated as follows:PTotal = IRY.RRY+ IYE.RYa+ IsR.RBRProtat = 44.4 x9 +42.4 x8+32.2 x12PTotal = 17.7kW +14.4kW +12.4kWPTotal = 44.5kWThe total real power (W) can be calculated using the 2 Wattmeter method as follows:PTotal =Using values measured from the phasor diagram:PTotal = 400x71x Cos 40° + 400x84 x Cos 47°PTotal = 21.7 kW + 22.9kWPTotat = 44.6kWie PRETTY CLOSE!!!!how did they get the scaled phasordiagram? how did they get the scales?break down simply really confused.

It is asked to explain about drawing phasor diagram.

Answered: how did they get the scaled phasor…

Engineering

Electrical Engineering

how did they get the scaled phasor diagram? how did they get the scales? break down simply really confused.

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

Q4 (Unbalanced Delta)
R
12-j3
9+j0 Z
t VAN
Vay V=400V
V,
N
VYN
BN
Y
8+j5
VRY
400230"
IRY =
= 44.4230"
920"
ZRY
4002-90
9.43432
VYR
Iya =
42.42-122"
4004150°
VaR
IBR =
ZaR
= 32.2Z164
12.42-14°
Draw scaled phasor diagram to determine line currents IR, ly and la
-lyB
IRY
VRY
-lBR
VRN
w1
Scale:
1cm=10A
w2
VRB
VYN
-IRY
VyB
Measured from the scaled phasor diagram:

IR = 71210°
Ir = 842-137"
Is = 442100°
The total real power (W) in the three phase load can be calculated as follows:
PTotal = IRY.RRY+ IYE.RYa+ IsR.RBR
Protat = 44.4 x9 +42.4 x8+32.2 x12
PTotal = 17.7kW +14.4kW +12.4kW
PTotal = 44.5kW
The total real power (W) can be calculated using the 2 Wattmeter method as follows:
PTotal =
Using values measured from the phasor diagram:
PTotal = 400x71x Cos 40° + 400x84 x Cos 47°
PTotal = 21.7 kW + 22.9kW
PTotat = 44.6kW
ie PRETTY CLOSE!!!!
how did they get the scaled phasor
diagram? how did they get the scales?
break down simply really confused.

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