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+clc

+clear

+

+//input

+kva=10;//kVA rating of the transformer

+vp=400;//voltage on primary side in volts

+vs=230;//voltage on secondary side in volts

+//short circuit test

+ppd1=18;//primary p.d. in volts

+ip1=25;//primary current in amperes

+inp1=120;//power input in watts

+//short circuit test

+ppd2=400;//primary p.d. in volts

+ip2=0.5;//primary current in amperes

+inp2=70;//power input in watts

+

+//calculations

+zp=ppd1/ip1;//equivalent primary impedance in ohms

+rp=inp1/(ip1^2);//equivalent resistance in ohms

+xp=((zp^2)-(rp^2))^0.5;//equivalent leakage reactance in ohms

+r0=(vp^2)/(1000*inp2);//resistance of parallel circuit

+phi=sin(acos(inp2/(vp*ip2)));//sine of power factor

+im=ip2*phi;//magnetizing current in amperes

+x0=vp/im;//reactance in ohms

+

+//output

+mprintf('the equivalent circuit parameters are \n Rp=%3.3f ohms \n Xp=%3.3f ohms \n r0=%3.3f kilo ohms \n x0=%3.1f ohms',rp,xp,r0,x0)