From b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b Mon Sep 17 00:00:00 2001
From: priyanka
Date: Wed, 24 Jun 2015 15:03:17 +0530
Subject: initial commit / add all books

---
 1938/CH6/EX6.13/6_13.jpg | Bin 0 -> 41130 bytes
 1938/CH6/EX6.13/6_13.sce |  30 ++++++++++++++++++++++++++++++
 2 files changed, 30 insertions(+)
 create mode 100755 1938/CH6/EX6.13/6_13.jpg
 create mode 100755 1938/CH6/EX6.13/6_13.sce

(limited to '1938/CH6/EX6.13')

diff --git a/1938/CH6/EX6.13/6_13.jpg b/1938/CH6/EX6.13/6_13.jpg
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diff --git a/1938/CH6/EX6.13/6_13.sce b/1938/CH6/EX6.13/6_13.sce
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index 000000000..f2c185b83
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@@ -0,0 +1,30 @@
+clc,clear
+printf('Example 6.13\n\n')
+
+V_L=11*10^3
+V_ph=V_L/sqrt(3)
+VA=700*10^3
+I_FL=VA/(sqrt(3)*V_L) //full load current
+IR_a=(1.5/100)*V_ph //product of I and R_a
+R_a=IR_a/I_FL
+IX_s=(14/100)*V_ph // product of I and X_s
+X_s=IX_s/I_FL //synchronous reactance
+
+//at full load and 0.8 pf
+I=I_FL
+phi=acos(0.8)
+V_ph=complex(V_ph*cos(phi),V_ph*sin(phi))  //just introduced the angle
+E_ph=sqrt(    (abs(V_ph)*cos(phi)+ IR_a)^2+   (abs(V_ph)*sin(phi)+ IX_s)^2     )
+
+Poles=4,f=50 //poles and frequency
+delta=asin( (abs(V_ph)*sin(phi)+IX_s)/E_ph)  -phi
+delta_dash_mech=(%pi/180) //displacement in degree mechanical
+//displacement in degree electrical
+delta_dash_elec=delta_dash_mech*(Poles/2)
+P_SY=abs(E_ph)*abs(V_ph)*cos(delta)*sin(delta_dash_elec)/X_s   //synchronising power per phase 
+P_SY_total=3*P_SY  //total synchronising power
+
+ns=120*f/(60*Poles)  //in r.p.s
+T_SY=P_SY_total/(2*%pi*ns)   //Synchronising torque 
+printf('Synchronising power is %.2fkW\n',P_SY_total/1000)
+printf('Synchronising torque is %.2f N-m',T_SY)
-- 
cgit