O A) A rectifiers shown in fig.3. If the output current assumed to be ripple free. (a) Draw the output voltage and current through each SCR, for thyristor firing angle a = (45°& 75°) (b) Determine the average value of the output voltage and current if the line voltage is Vms = 400 V and R= 100 ohms when a 30°, a = 90°, and a = 135°. (c) How is the average load voltage affected if thyristor T2 failed to open circuit? %3D %3D %3D %3D

Electric Motor Control
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Q3) A) A rectifiers shown in fig.3. If the output current assumed to be ripple free.
(a) Draw the output voltage and current through each SCR, for thyristor firing
angle a = (45°& 75°)
(b) Determine the average value of the output voltage and current if the line voltage
is Vms = 400 V and R= 100 ohms when a = 30°, a = 90°, and a = 135°.
(c) How is the average load voltage affected if thyristor T2 failed to open circuit?
a
Van
T2
Vbn
io
Vcn
T3
Vo
Fig.3
B) A 3 phase full converter shown in fig.4 supply an inductive load with ripple free
current. By assuming VyB= Vml sin wt and a360° the following load voltage is
obtained . Find x1,X2 and x3
P1
P2
P3
R
Y
Vo
B
N2
Ng
Fig.4
X2
X3
2n
2n
ot
Output voltage wave form
...
Transcribed Image Text:Q3) A) A rectifiers shown in fig.3. If the output current assumed to be ripple free. (a) Draw the output voltage and current through each SCR, for thyristor firing angle a = (45°& 75°) (b) Determine the average value of the output voltage and current if the line voltage is Vms = 400 V and R= 100 ohms when a = 30°, a = 90°, and a = 135°. (c) How is the average load voltage affected if thyristor T2 failed to open circuit? a Van T2 Vbn io Vcn T3 Vo Fig.3 B) A 3 phase full converter shown in fig.4 supply an inductive load with ripple free current. By assuming VyB= Vml sin wt and a360° the following load voltage is obtained . Find x1,X2 and x3 P1 P2 P3 R Y Vo B N2 Ng Fig.4 X2 X3 2n 2n ot Output voltage wave form ...
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