initial commit / add all books

1 files changed, 23 insertions, 0 deletions

diff --git a/3760/CH4/EX4.67/Ex4_67.sce b/3760/CH4/EX4.67/Ex4_67.sce
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+clc;

+p=10000; // rated power of generator

+v=250; // rated voltage of generator

+l1=400; // rotationl losses

+ra=0.5; // armature resistance

+rf=250; // shunt field resistance

+ifl=v/rf; // constant field current

+lc=ifl*rf+l1; // constant losses

+io=p/v; // output current of generator

+ia=io+ifl; // armature current

+la=ia^2*ra; // armature circuit loss

+ps=p+lc+la; // generator shaft power input

+printf('Generator shaft power input is %f W\n',ps);

+ng=(1-((lc+la)/ps))*100; 

+printf('Efficiency at rated load is %f percent\n',ng);

+// at maximum efficiency variable losses= constant losses

+ia=sqrt(lc/ra); // armature current at maximum efficiency

+io=floor(ia)-ifl; // output current of generator

+po=v*io; // output power

+printf('Generator output at maximum efficiency is %f W\n',po);

+pi=po+2*lc;

+nm=(1-((lc+lc)/pi))*100; 

+printf('Maximum efficiency is %f percent\n',nm);