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Diffstat (limited to '3681/CH11/EX11.20')
| -rw-r--r-- | 3681/CH11/EX11.20/Ans11_20.PNG | bin | 0 -> 7243 bytes | |||
| -rw-r--r-- | 3681/CH11/EX11.20/Ex11_20.sce | 32 |
2 files changed, 32 insertions, 0 deletions
diff --git a/3681/CH11/EX11.20/Ans11_20.PNG b/3681/CH11/EX11.20/Ans11_20.PNG Binary files differnew file mode 100644 index 000000000..b7f55017e --- /dev/null +++ b/3681/CH11/EX11.20/Ans11_20.PNG diff --git a/3681/CH11/EX11.20/Ex11_20.sce b/3681/CH11/EX11.20/Ex11_20.sce new file mode 100644 index 000000000..a56be267e --- /dev/null +++ b/3681/CH11/EX11.20/Ex11_20.sce @@ -0,0 +1,32 @@ +// Calculating the kVA output of the machine
+clc;
+disp('Example 11.20, Page No. = 11.56')
+// Given Data
+// 3 phase turbo-alternator
+rpm = 3000;// R.p.m.
+f = 50;// Frequency (in Hz)
+L = 0.94;// Core length (in meter)
+Bav = 0.45;// Average gap density (in Wb per meter sqaure)
+ac = 25000;// Ampere conductors per meter
+Va = 100;// Peripheral speed of rotor (in meter per second)
+lg = 20;// Length of air gap (in mm)
+Kw = 0.95;// Winding factor
+// Winding is infinitely distributed with a phase spread of 60 degree
+// Calculation of the kVA output of the machine
+ns = rpm/60;// R.p.s
+Dr = Va/(%pi*ns);// Diameter of rotor (in meter)
+D = Dr+(2*lg*10^(-3));// Stator bore (in meter)
+// for full pitch
+Kd = 0.955;// Distribution factor
+Kp = 1;// Pitch factor
+Kw = Kd*Kp;// Winding factor
+Q = 11*Kw*Bav*ac*D*D*L*ns*10^(-3);// kVA output
+disp(Q,'(a) kVA output of machine (kVA)=');
+// for chorded by 1/3 pole pitch
+alpha = 180/3;// Angle of chording
+Kp = cos(alpha*%pi/180/2);// Pitch factor
+Kd = 0.955;// Distribution factor
+Kw = Kd*Kp;// Winding factor
+Q = 11*Kw*Bav*ac*D*D*L*ns*10^(-3);// kVA output
+disp(Q,'(b) kVA output of machine (kVA)=');
+//in book answers are 2480 kVA and 2147 kVA respectively. The provided in the textbook is wrong
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