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-rw-r--r--3816/CH8/EX8.4/8_4.pngbin0 -> 29362 bytes
-rw-r--r--3816/CH8/EX8.4/8_4.sce40
-rw-r--r--3816/CH8/EX8.5/8_5.pngbin0 -> 51591 bytes
-rw-r--r--3816/CH8/EX8.5/8_5.sce30
-rw-r--r--3816/CH8/EX8.7.a/8_7a.pngbin0 -> 22441 bytes
-rw-r--r--3816/CH8/EX8.7.a/8_7a.sce16
-rw-r--r--3816/CH8/EX8.7/8_7.pngbin0 -> 25393 bytes
-rw-r--r--3816/CH8/EX8.7/8_7.sce31
-rw-r--r--3816/CH8/EX8.8/8_8.pngbin0 -> 27734 bytes
-rw-r--r--3816/CH8/EX8.8/8_8.sce21
-rw-r--r--3816/CH8/EX8.9/8_9.pngbin0 -> 30271 bytes
-rw-r--r--3816/CH8/EX8.9/8_9.sce23
12 files changed, 161 insertions, 0 deletions
diff --git a/3816/CH8/EX8.4/8_4.png b/3816/CH8/EX8.4/8_4.png
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diff --git a/3816/CH8/EX8.4/8_4.sce b/3816/CH8/EX8.4/8_4.sce
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+clc;
+clear;
+V=3.3;
+f=50;
+P=10;
+S=0.03;
+I=4;//Magnetizing current
+Lc=30;//core loss
+Zsl=0.18+(1.6*%i);//stator leakage impedance
+Zrl=0.4+(1.6*%i);//Rotor stan still leakage impedance
+W=27*10^2;
+Vph=1.9;//Rated phase voltage
+Ibsc=W/(3*Vph);//Bus bar short circuit current level
+Zs1=(Vph/Ibsc)*%i;//The effective system impedance
+disp('When the machines running at slip 0.03:')
+Z1=((real(Zsl)+(real(Zrl)/S))+(imag(Zsl)+imag(Zrl))*%i);
+disp(Z1,'The total impedance is:')
+I2o=1900/Z1;
+I2=real(I2o);
+disp(I2,'I2=')
+P2=3*I2^2*((real(Zrl))/S);
+disp(P2,'P2=')
+Pm=P2*(1-S);
+disp(Pm,'Pm=')
+Me=P2/62.8;
+disp(Me,'Me=')
+Io=(P/Vph)-(40*%i);
+disp(Io,'Io=')
+I1=Io+I2o;
+disp(I1,'I1=')
+pf1=cosd(-27)
+disp(pf1,'Power factor=')
+disp('During the starting torque with ON-line switching:')
+Z2=(Zrl+Zsl);//The impedance value is increased to 3.65
+Z2=3.65;
+disp(Z2,'Z2=')
+I2=(Vph*10^3)/Z2;
+disp(I2,'I2=')
+Ms=3*I2^2*(real(Zrl)/62.8);
+disp(Ms,'Ms=')
diff --git a/3816/CH8/EX8.5/8_5.png b/3816/CH8/EX8.5/8_5.png
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index 000000000..b41812a44
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+++ b/3816/CH8/EX8.5/8_5.png
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diff --git a/3816/CH8/EX8.5/8_5.sce b/3816/CH8/EX8.5/8_5.sce
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index 000000000..c631fa0cf
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+clc;
+clear;
+Sfl=0.05;//slip of full load current
+disp('during direct switching')
+Vmp=1;
+Imp=6*Vmp;
+Ila=6*Vmp;
+Ta=0.3*Imp;
+disp(Ta,Ila,Imp,Vmp,'The motor phase voltage,motor phase current line current and torque during direct switching are:')
+disp('During stator resistance switching:')
+Vmpb=0.33;
+Impb=6*Vmpb;
+Ilb=6*Vmpb;
+Tb=0.3*Impb;
+disp(Tb,Ilb,Impb,Vmpb,'The motor phase voltage,motor phase current line current and torque during stator resistance switching are:')
+disp('During auto transformer starting with the motor current limied to 2pu')
+Vmpc=0.33;
+Impc=6*Vmpc;
+Ilc=6*Vmpc;
+Tc=0.3*Impc;
+disp(Tc,Ilc,Impc,Vmpc,'The motor phase voltage,motor phase current line current and torque during auto transformer starting with the motor current limied to 2pu switching are:')
+disp('During star delta starting:')
+Vmpd=0.58;
+Impd=6*Vmpd;
+Ild=6*Vmpd;
+Td=0.3*Impd;
+disp(Td,Ild,Impd,Vmpd,'The motor phase voltage,motor phase current line current and torque during star delta starting are:')
+disp('For full load torque ')
+Ilat=(0.75^2);
+disp('times the full load current',Ilat,'The line current is:')
diff --git a/3816/CH8/EX8.7.a/8_7a.png b/3816/CH8/EX8.7.a/8_7a.png
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index 000000000..257857162
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diff --git a/3816/CH8/EX8.7.a/8_7a.sce b/3816/CH8/EX8.7.a/8_7a.sce
new file mode 100644
index 000000000..fce834af5
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+++ b/3816/CH8/EX8.7.a/8_7a.sce
@@ -0,0 +1,16 @@
+clc;
+clear;
+V=420;
+f=50;
+P=6;
+Z=1+(2*%i);//Both stator and rotor referred leakage impedance
+J=3;//Total inertia of the drive
+S1=1.96;
+S2=1;
+r1=1;
+r2=1;
+x1=4;
+ti=((((r1^2)+(x1^2))/(2*r2))*((S2^2)-(S1^2)))+(2*r1*(S2-S1))+(r2*log(S2/S1));
+Ws=2*%pi*(1000/60);
+t=J*(105^2)*(-ti/(V^2));
+disp(Ws,t,'The total time and speed is:')
diff --git a/3816/CH8/EX8.7/8_7.png b/3816/CH8/EX8.7/8_7.png
new file mode 100644
index 000000000..c9a83ed61
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diff --git a/3816/CH8/EX8.7/8_7.sce b/3816/CH8/EX8.7/8_7.sce
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index 000000000..e3d5f74a7
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+clc;
+clear;
+W=375;
+V=3;
+f=50;
+P=10;
+r2=0.39;//Rotor resistance
+X1=5.75;//Leakage reactance
+Rsr=4.65//Stator to rotor turns ratio
+Sfl=0.022;//Full load slip
+Ws=62.8;//Synchronous speed
+Wfl=125;//Full load output
+Tfl=Wfl/(Ws*0.978);//Full load torque
+Tpo=(1730^2)/(2*X1*Ws);//Pull out torque
+disp('Constant torque')
+q=Tfl/Tpo;
+R2=0.5*(X1/q)*(1+(1-(q^2)));
+R=R2-r2;
+Sp2=0.5*(Wfl/0.978);
+pf=0.5;
+Rrt=R/(Rsr^2);
+disp(Rrt,'Actual resistance in rotor turn:')
+disp('Torque proportional to speed squared')
+Sp3=2.04*((0.5/0.978)^2);
+q1=Sp3/Tpo;
+R2o=0.5*(X1/q1)*(1+(1-(q1^2)));
+R1=R2o-r2;
+Sp4=16.6;
+pf1=0.5;
+Rrt2=R1/(Rsr^2);
+disp(Rrt2,'Actual resistance in rotor turn:')
diff --git a/3816/CH8/EX8.8/8_8.png b/3816/CH8/EX8.8/8_8.png
new file mode 100644
index 000000000..01e0dbdc6
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diff --git a/3816/CH8/EX8.8/8_8.sce b/3816/CH8/EX8.8/8_8.sce
new file mode 100644
index 000000000..12f58f0f7
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+++ b/3816/CH8/EX8.8/8_8.sce
@@ -0,0 +1,21 @@
+clc;
+clear;
+W=1000;
+P=10;
+T=573;//Full load torque
+Ke=9;//Kinetic energy stored
+Sfl=0.10;//Slip for full load torque
+Mo=5;//idling torque
+M1=40;//instantaneous torque
+Tfl=16.7;//Rated full load torque
+S=0.1;//Rated full load torque is developed at 0.1
+K=167;
+M=K*S;
+alpha=7;
+t=[0:0.1:5];
+J=Ke*(10^6)*(1/2)*(60^2);
+Ws=62.8;//Synchronous speed
+M=((M1-Mo+(alpha*((J*Ws)/K)))*(1-exp((-K)/(J*Ws))*t))+Mo-(alpha*t);
+plot(t,M);
+xlabel('Time')
+ylabel('Torque')
diff --git a/3816/CH8/EX8.9/8_9.png b/3816/CH8/EX8.9/8_9.png
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index 000000000..5314bc4a2
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diff --git a/3816/CH8/EX8.9/8_9.sce b/3816/CH8/EX8.9/8_9.sce
new file mode 100644
index 000000000..7c9391379
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+++ b/3816/CH8/EX8.9/8_9.sce
@@ -0,0 +1,23 @@
+clc;
+clear;
+disp('Self Excitation')
+Sm=24*10^(-3);//minimum capacitive susceptance
+C=Sm/314;
+disp(C,'The capacitance at self excitation is:')
+disp('For generating 3KV:')
+Sm1=43*10^(-3);//Using method of interpolation we get 43ms for 1.73KV/Ph(3KV line)
+C1=Sm1/314;
+disp(C1,'The capacitance for generating 3KV is:')
+disp('To determine the operating conditions for a load(125-20i)A at 3KV 50Hz')
+Im=60;
+It=10;
+Ir=125;
+Ix=20;
+Ia=Ir+It;
+Ia1=Ix+Im;
+Ic=104;
+Sm2=59.6*10^(-3);
+C2=Sm2/314;
+disp(Ia1,Ia,'The active currents are:')
+disp(Ic,'The capacitive current is:')
+disp(C2,'The capacitance in micro farad is:')