Q5 (Large Single Phase Resistive load connected to 3 phase supply) Single Phase Resistive Load eg Electric Arc Furnace Additional C and L to give balanced LINE currents VRN Vey V Xe = 3.R XL = - T3.R In this example: R=0.250 Therefore: Zc=-j0.43 Zz=j0.43 Calculate the load phase currents: 4.4 cm 44030° VRY IRY = ZRY = 1760Z30° 0.2520° A 2.56cm V YB IYB = ZYB 440Z - 90° = 102320" 0.43Z-90° 2 om 440Z150° VBR IBR = ZBR = 1023260° 0.43290° V BR VBN -lyB IRY VRY IBR [36 120 + VRN Talvo 360 Scale: 1cm=400A -IRY VRB VYN VYB
Q5 (Large Single Phase Resistive load connected to 3 phase supply) Single Phase Resistive Load eg Electric Arc Furnace Additional C and L to give balanced LINE currents VRN Vey V Xe = 3.R XL = - T3.R In this example: R=0.250 Therefore: Zc=-j0.43 Zz=j0.43 Calculate the load phase currents: 4.4 cm 44030° VRY IRY = ZRY = 1760Z30° 0.2520° A 2.56cm V YB IYB = ZYB 440Z - 90° = 102320" 0.43Z-90° 2 om 440Z150° VBR IBR = ZBR = 1023260° 0.43290° V BR VBN -lyB IRY VRY IBR [36 120 + VRN Talvo 360 Scale: 1cm=400A -IRY VRB VYN VYB
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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Question
How did they get Zc=j0.43 and Zl=j0.43? How did they get the diagram break down simply?

Transcribed Image Text:Q5 (Large Single Phase Resistive load connected to 3 phase supply)
Single Phase Resistive Load
eg Electric Arc Furnace
Additional C and L
to give balanced
LINE currents
R
VRN
Vey
Xe = 3.R
C.
XL =
-3.R
In this example:
R=0.250
Therefore:
Zc=-j0.43
Zz=j0.43
Calculate the load phase currents:
4.4 cm
440430°
VRY
IRY =
ZRY
= 1760Z30°
0.2520°
A 2.56cm
V YB
IYR =
ZYB
440Z - 90°
= 102320"
0.43Z - 90°
2 cm
440Z150°
VBR
IBR =
ZBR
= 1023Z60°
0.43290°
VBR
VRY
VBN
-lyB
IBR
IRY
[36
120
360
+ VRN
Scale:
-IRY
1cm=400A
VRB
VYN
VYB

Transcribed Image Text:A large single phase load (represented by a resistance of 0.25Q) is to
be connected to a three phase 440V/50HZ system. Determine he
necessary (delta connected) Capacitance and Inductance reactances
to give balanced line currents. Calculate the resultant load phase
currents and from a scaled phasor diagram plot and estimate the
three line currents, and the total power (W) taken from the supply.
Q5
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