B. Open-Ended Question 6. A 45 hp, 50 Hz, 415 V delta connected induction motor has a full load efficiency of 0.80 and p.f0.60. The p.f is to be improved to 0.9 using static capacitors. Determine (i) rating of capacitor bank kVAR, (ii) capacitance of each unit, if they connected as (a) delta, and (b) star, in μF.
B. Open-Ended Question 6. A 45 hp, 50 Hz, 415 V delta connected induction motor has a full load efficiency of 0.80 and p.f0.60. The p.f is to be improved to 0.9 using static capacitors. Determine (i) rating of capacitor bank kVAR, (ii) capacitance of each unit, if they connected as (a) delta, and (b) star, in μF.
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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Transcribed Image Text:B. Open-Ended Question
6. A 45 hp, 50 Hz, 415 V delta connected induction motor has a full load efficiency of
0.80 and p.f0.60. The p.f is to be improved to 0.9 using static capacitors. Determine
(i) rating of capacitor bank kVAR,
(ii) capacitance of each unit, if they connected as (a) delta, and (b) star, in uF.
7. Figure 1 shows the electrical power system with rated capacity of S₁= S₂=25 MVA,
connected with two step-up transformers 11 kV/66 kV, respectively. The short
circuit fault at point 'p' occurs at the outlet of transmission line. Calculate the short
circuit current and three phase short circuit capacity occur at the point 'p'.
S₂=25 MVA
G₁
% Xg1 = 30
T₁
% XT1= 5
Transmission
line
11/66 kVA
S₂=25 MVA
T₂
CB
~) G₂ % Xg2 = 30
% XT2 = 8
11/66 kVA
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