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+clc

+clear

+

+//input

+kva=5;//kVA rating of the transformer

+pf=0.8;//power factor

+vp=250;//voltage on primary side in volts

+vs=500;//voltage on secondary side in volts

+//from equivalent circuit

+r0=750;//resistance in ohms

+x0=325;//reactance in ohms

+Rp=0.4;//equivalent resistance refered to primary side in ohms

+Xp=0.75;//equivalent reactance refered to primary side in ohms

+

+//calculations

+is=(kva*1000)/vs;//full load secondary current in amperes

+ip1=is*(vs/vp);//current in amperes

+ep=vp-((ip1*pf)+(Xp*sin(acos(pf))));//in volts

+Vs=ep*(vs/vp);// in volts

+i1=vp/(vs+vp);//component of Io in phase with Vs in amperes

+i2=i1*pf;//component of Ie in phase with Ip

+i3=i1*sin(acos(pf));//component of Ie in quadrature with Ip

+im=vp/x0;//magnetizing current in amperes

+i4=im*sin(acos(pf));//component of Im in phase with Ip

+i5=im*pf;//component of Im in quadrature with Ip

+Ip=(((ip1+i2+i4)^2)+((i5-i3)^2))^0.5;//total primary current in amperes

+P=vp*Ip*pf;//power input in watts

+pc=ip1*ip1*i4;//copper loss in watts

+pi=vp*i1;//iron loss in watts

+n=1-((pc+pi)/P);//efficiency in per units

+

+//output

+mprintf('the primary input current is %3.2f A : the secondary terminal voltage is %3.0f V and the efficiency of the transformer is %3.2f p.u.',Ip,Vs,n)