2. Find the primary apparent power and the transformer turns ratio for the system below. 43.3kV иш ли eff=0.96 m 300V www ши m ли 20hp pf=0.8

Electric Motor Control
10th Edition
ISBN:9781133702818
Author:Herman
Publisher:Herman
Chapter3: Magnetic Starters
Section: Chapter Questions
Problem 30SQ
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2. Find the primary apparent power and the transformer turns ratio for the system
below.
43.3kV
m
كلات
w
m
m
mm
eff=0.96
300V
ли
m
ကာ
m
20hp
pf=0.8
Transcribed Image Text:2. Find the primary apparent power and the transformer turns ratio for the system below. 43.3kV m كلات w m m mm eff=0.96 300V ли m ကာ m 20hp pf=0.8
Expert Solution
Step 1

Given data:

input voltage V= 43.3 kV =(VL=Vph)

Since in delta line voltage is same as phase voltage.

V2= 300 volts 

Load rating PL= 20 hp

=20×745.7=14914 watts

Load power factor cosΦL= 0.8

Transformer efficiency=0.96

Asked to find 

1. Primary apparent power

2. Transformer turns ratio

 

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