initial commit / add all books

1 files changed, 29 insertions, 0 deletions

diff --git a/3760/CH4/EX4.26/Ex4_26.sce b/3760/CH4/EX4.26/Ex4_26.sce
new file mode 100644
index 000000000..2344fb06c
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+++ b/3760/CH4/EX4.26/Ex4_26.sce
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+clc;

+Vt=250;//rated o/p voltage of generator

+Pout=10000;//o/p of generator in watts

+Ra=0.4;//armature resistance

+Rse=0.2;//series field resistance

+Rs=125;//shunt field reesistance

+Vb=2;//total brush cotact drop

+Il=Pout/Vt;//load current

+

+//PART(a)-LONG SHUNT CONNECTION

+If=Vt/Rs;//shunt field current

+Ia=Il+If;//armature current

+//series field winding also carries Ia.

+Eal=Vt+Ia*(Rse+Ra)+Vb;//generated emf in armature

+printf('The generated EMF in armature when the generated is connected as long shunt machine is %f.\n',Eal);

+

+//PART(b)-SHORT SHUNT CONNECTION

+V=Vt+Il*Rse;//voltage across shunt field and armature terminals

+If_=V/Rs;//shunt field current

+Ia_=Il+If_;//armature current

+Eas=V+Ia*Ra+Vb;//generated emf in armature

+printf('The generated EMF in armature when the generated is connected as short shunt machine is %f.',Eas);

+

+//PART(c)-

+//Series field ampere turns are proportional to series-field current I

+//Is=0.3/0.5*I, where , Is is series field current with diverter.

+//series field ampere-turns with dvider = K*0.6*Is, where K is a constant.

+//percentage reduction in series field ampere turns is - ((I-O.6I)/I)*100.

+disp('Percentage reduction in series field ampere turns is 40%.');