initial commit / add all books

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+clc;

+E1=230; // primary rating of transformer 1 and transformer 2

+E2=400; // secondary rating of transformer 1

+e2=410; // secondary rating of transformer 2

+iv=25; // current feeded by voltage regulator to h v series winding

+pc=200; // core loss in each transformer

+r=1 // assuming resistance of transformer to be 1

+x=3*r // as per question leakage reactance is thrice of resistance 

+il1=(iv*E2)/E1; // primary current of transformer 1

+il2=(iv*e2)/E1; // primary current of transformer 2

+pf=r/sqrt(r^2+x^2); // power factor during short circuit

+// As per the circuit diagram given in question, by Kirchoffs current law current through current coil of wattmeter W1 is given by

+I=il2-il1;

+// 2*core loss is the reading of wattmeter 2

+W=E1*I*pf; // reading of wattmeter 1 connected on l v side

+// in circuit diagram if terminal a is connected to c and terminal b is connected to d the current I and Io (no load current) flow in the same direction of current coil of Wattmeter.Hence its reading is increased to 

+Wt=2*pc+W; 

+printf('reading of wattmeter as per the connection described is %f W\n',Wt);

+// in circuit diagram if terminal c is connected to b and terminal d is connected to a the current I and Io (no load current) flow in the opposite direction through current coil of Wattmeter.Hence its reading is decreased to 

+Wt=2*pc-W;

+printf('reading of wattmeter as per the connection described is %f W',Wt);

+

+