Machine Design code

MachineDesign.c

#include<stdio.h>
#include<math.h>
#include<stdlib.h>
#include<conio.h>


#define pi 3.141592653589
#define muo 0.000001256

// Object oriented code = best code

typedef struct _core{
  float K; //Value of the Voltage per turn Factor
  float Et; // Voltage per turn
  float phi_m;
  float Bm; //Max Flux density
  float Ai; //Iron area
  float Agi; // Gross Area of Core
  float Ki; //Stacking Factor

  float ct; //Ai = ct*d^2
  float p;
  float q;
  float r;
  float s;

  float d;
  int coreType;

} Core;

typedef struct _window{
  float Kw; //Space Factor
  float currentDensity; //in A/mm^2
  float Aw; //Area of Window
  float Hw;
  float Ww;
  float ratio; // Hw and Ww ka ratio
  float distanceBetweenCores;

} Window;

typedef struct _yoke{
  float Ayoke;
  float Dy;
  float Hy;
  float Bm;
} Yoke;

typedef struct _frame{
  float H;
  float W;
  float D;
} Frame;

typedef struct _lv{
  int turnsPerPhase;
  float currentDensity;
  float As; //in mm^2
  float x1;
  float x2;
  int layers;
  int turnsPerLayer;
  float axialDepth;
  float radialDepth;
  float Di; //Inner Dia
  float Do; //Outer Dia
  float conductorInsulation;
  float clearance;
  float pressBoard;

} LVwindingData;

typedef struct _hv{
  int turnsPerPhase;
  float Ap; //in mm^2
  float Di; //Inner Dia
  float Do; //Outer Dia
  float x1;
  float x2;
  float clearance;
  float clearanceAxial;
  float insulation;
  float conductorInsulation;
  float axialDepth;
  float radialDepth;
  float t;
  int numDiscs;
  float voltagePerDisc;
  int turnsPerDisc;
  float currentDensity;
  float bakelizedPaper;
  float spacer;


} HVwindingData;

typedef struct _resistance{
  float pu;
  float absolute;
} Resistance;

typedef struct _reactance{
  float pu;
  float absolute;
} Reactance;


typedef struct _impedance{
  Resistance R;
  Reactance X;
  float pu;
  float absolute;
} Impedance;

typedef struct _regulation{
  float value;
  float pu;
  float pf;

} Regulation;

typedef struct _coreloss{
  float yoke;
  float limb;
  float lamDensity;
  float yokeSpec;
  float limbSpec;
  float yokeWeight;
  float limbWeight;
  float value;

} CoreLoss;

typedef struct _losses{
  CoreLoss CoreLoss;
  float CopperLoss;
  float totalLoss;
} Losses;

typedef struct _tank{
  float H;
  float W;
  float L;
  float S;
  float diss;
  float tempRise;
} Tank;

typedef struct _transformer{
  float kVA;
  float Vp; //Primary HV side Voltage(in KV)
  float Vs; //Secondary LV side Volatge(in KV)
  float phase; // Number of phases
  float frequency; //Obvio
  float maxTappings;
  float VpPhase;
  float VsPhase;
  float Ip; //in A
  float Is; //in A
  float IpPhase; //in A
  float IsPhase; //in A

  int primaryType; // 1 for Delta 2 for Star
  int secondaryType;

  Core Core;
  Window Window;
  Yoke Yoke;
  Frame Frame;
  LVwindingData LV;
  HVwindingData HV;

  Impedance Z;
  Regulation Regulation;
  Losses Losses;
  float percentLoading;
  float efficiency;
  Tank Tank;

} Transformer;

void readFloat(char *c,float *f){
  printf("\n");
  printf("%s : ",c);
  scanf("%f",f);
}

void readInt(char *c,int *f){
  printf("\n");
  printf("%s : ",c);
  scanf("%d",f);
}

int mToMM(float num){
  int ans;
  float temp;
  temp = num*1000;
  ans  = (int)temp;
  float decimal;
  decimal = temp - (float)ans;
  decimal*= 10;
  if(decimal/1< 5){
    return ans;
  }else{
    return ans+1;
  }
}


Core coreDesign(Transformer transformerData){
  Core ans;

  readFloat("Enter the value of K\nFor Distribution Transformers, K=0.45\nFor Power Transformers, K=0.6 to 0.7",&ans.K);

  //Et
  ans.Et = ans.K * sqrt(transformerData.kVA);
  printf("\n=> Et = %.2f V",ans.Et);

  //phi_m
  ans.phi_m = ans.Et/(4.44*transformerData.frequency);
  printf("\n=> phi_m = %.4f Wb\n",ans.phi_m);

  //Ai
  readFloat("Enter the value of Bm(in Wb/m^2)\nFor Distribution Transformers,Bm=1 to 1.35 Wb/m^2\nFor Power Transformers,Bm = 1.25 to 1.60 Wb/m^2",&ans.Bm);
  ans.Ai = ans.phi_m/ans.Bm;
  printf("\n=> Net Iron Area = %.4f m^2\n",ans.Ai);

  //Agi
  readFloat("Enter the value of Stacking Factor (Typically 0.9)",&ans.Ki);
  ans.Agi = ans.Ai/ans.Ki;
  printf("\n=> Gross Area = %.4f m^2\n",ans.phi_m);

  readInt("\nEnter the Core Type\n1. Square\n2. Cruciform\n3. 3-stepped\n4. 4-stepped",&ans.coreType);
  switch(ans.coreType){
    case 1:
      ans.ct = 0.45;
      ans.d = sqrt(ans.Ai/ans.ct);
      printf("\n=> Diameter of core is %.4f m",ans.d);
      ans.p = sqrt(0.5)*ans.d;
      printf("\n=> Dimension is %.4f m",ans.p);
      break;

    case 2:
      ans.ct = 0.56;
      ans.d = sqrt(ans.Ai/ans.ct);
      printf("\n=> Diameter of core is %.4f m",ans.d);
      ans.p = 0.85*ans.d;
      ans.q = 0.53*ans.d;
      printf("\n=> Dimension is p = %.4f m , q = %.4f m",ans.p,ans.q);
      break;

    case 3:
      ans.ct = 0.6;
      ans.d = sqrt(ans.Ai/ans.ct);
      printf("\n=> Diameter of core is %.4f m",ans.d);
      ans.p = 0.9*ans.d;
      ans.q = 0.7*ans.d;
      ans.r = 0.42*ans.d;
      printf("\n=> Dimension is p = %.4f m , q = %.4f m , r = %.4f m",ans.p,ans.q,ans.r);
      break;

    case 4:
      ans.ct = 0.62;
      ans.d = sqrt(ans.Ai/ans.ct);
      printf("\n=> Diameter of core is %.4f m",ans.d);
      ans.p = 0.36*ans.d;
      ans.q = 0.36*ans.d;
      ans.r = 0.78*ans.d;
      ans.s = 0.92*ans.d;
      printf("\n=> Dimension is p = %.4f m , q = %.4f m , r = %.4f m , s = %.4f m",ans.p,ans.q,ans.r,ans.s);
      break;
  }

  return ans;
}

Window windowDesign(Transformer transformerData){
  // Window Space Factor
  Window ans;

  if(transformerData.kVA <200){
    ans.Kw = 8/(30+transformerData.kVA);
  }else if(transformerData.kVA <700){
    ans.Kw = 10/(30+transformerData.kVA);
  }else if(transformerData.kVA <1000){
    ans.Kw = 12/(30+transformerData.kVA);
  }else{
    ans.Kw = 0.21;
  }

  readFloat("Enter the value of Current Density(in A/mm^2)",&ans.currentDensity);

  //Aw calculation
  ans.Aw = transformerData.kVA/(3.33*transformerData.frequency*transformerData.Core.Bm*ans.Kw*ans.currentDensity*1000*transformerData.Core.Ai);
  printf("\n=> Window area = %.4f m^2",ans.Aw);

  readFloat("Enter the value of ratio of Hw and Ww",&ans.ratio);
  ans.Ww = sqrt(ans.Aw/ans.ratio);
  ans.Hw = ans.ratio*ans.Ww;
  ans.distanceBetweenCores = ans.Ww + transformerData.Core.d;
  printf("\n\n _____________Window Dimensions____________");
  printf("\n => Width of Window = %d mm",mToMM(ans.Ww));
  printf("\n => Height of Window = %d mm",mToMM(ans.Hw));
  printf("\n => Distance between adjacent Core centers = %d mm",mToMM(ans.distanceBetweenCores));

  return ans;
}

Yoke yokeDesign(Transformer transformerData){
  Yoke ans;

  ans.Ayoke = 1.2 * transformerData.Core.Ai;
  printf("\n=> Net area of Yoke = %f m^2", ans.Ayoke);
  printf("\n=> Gross area of Yoke = %f m^2", ans.Ayoke/transformerData.Core.Ki);
  ans.Dy = transformerData.Core.p;
  ans.Hy = ans.Ayoke/(transformerData.Core.Ki*ans.Dy);

  printf("\n\n _____________Yoke Dimensions____________");
  printf("\n => Depth of Yoke = %d mm",mToMM(ans.Dy));
  printf("\n => Height of Yoke = %d mm",mToMM(ans.Hy));

  ans.Bm = transformerData.Core.Bm/1.2;


  return ans;
}

Frame frameDesign(Transformer transformerData){
  Frame ans;

  ans.H = transformerData.Window.Hw + 2*transformerData.Yoke.Hy;
  ans.W = 2*transformerData.Window.distanceBetweenCores + transformerData.Core.p;
  ans.D = transformerData.Yoke.Dy;

  printf("\n => Height of Frame = %d mm",mToMM(ans.H));
  printf("\n => Width of Frame = %d mm",mToMM(ans.W));
  printf("\n => Depth of Frame = %d mm",mToMM(ans.D));

  return ans;
}

LVwindingData lvDesign(Transformer transformerData){
  LVwindingData ans;
  float x;
  x = (transformerData.VsPhase*1000)/transformerData.Core.Et;
  ans.turnsPerPhase = (int)x + 1;

  readFloat("Enter the Current density for LV (in A/mm^2)",&ans.currentDensity);
  ans.As = transformerData.IsPhase/ans.currentDensity;
  printf("\n=> Area of Cross Section of LV winding Conductor(theoretical) = %f mm^2",ans.As);
  printf("\nEnter the proper Conductor dimensions as per IS:1897-1962 standards(in mm) seperated by a [space] : ");
  scanf("%f %f",&ans.x1,&ans.x2);
  readFloat("Enter the required Insulation(in mm)",&ans.conductorInsulation);
  ans.As = ans.x1*ans.x2;
  ans.currentDensity = transformerData.IsPhase/ans.As;

  ans.x1 += ans.conductorInsulation;
  ans.x2 += ans.conductorInsulation;
  printf("\n=> Dimensions of Insulated conductors = %f x %f mm",ans.x1,ans.x2);


  //Helical Winding
  printf("\n__________For Helical Winding__________");
  readInt("Enter the number of layers",&ans.layers);
  ans.turnsPerLayer = (int)(ans.turnsPerPhase/ans.layers) + 1;
  printf("\nUsing Helical Winding, space is to be provided for %d turns along the axis",ans.turnsPerLayer);

  //Axial Depth
  ans.axialDepth = ans.turnsPerLayer * ans.x1;

  //Radial Depth
  ans.radialDepth= ans.layers * ans.x2 + (ans.layers-1)*ans.conductorInsulation;

  //Inner Dia
  readFloat("Enter the thickness of press board cylinder(in mm)",&ans.pressBoard);
  ans.Di = transformerData.Core.d*1000 + 2*ans.pressBoard;

  //Outer Dia
  ans.Do = ans.Di + 2*ans.radialDepth;

  //clearance
  ans.clearance = (transformerData.Window.Hw*1000 - ans.axialDepth)/2;

  printf("\n\n _____________LV Dimensions____________");
  printf("\n=> Axial Depth of LV Windings = %f mm",ans.axialDepth);
  printf("\n=> Clearance = %f mm on either side",ans.clearance);
  printf("\n=> Radial Depth of LV Windings = %f mm",ans.radialDepth);
  printf("\n=> Inner Diameter = %f mm",ans.Di);
  printf("\n=> Outer Diameter = %f mm",ans.Do);
  return ans;
}

HVwindingData hvDesign(Transformer transformerData){
  HVwindingData ans;

  //Turns per phase
  ans.turnsPerPhase = transformerData.LV.turnsPerPhase*(transformerData.VpPhase/transformerData.VsPhase);
  printf("\n=>HV Turns per phase = %d",ans.turnsPerPhase);

  ans.turnsPerPhase *= (1+(transformerData.maxTappings/100));
  printf("\n=>HV Turns per phase after considering tappings = %d",ans.turnsPerPhase);

  readFloat("Enter the value of Current Density(HV) (in A/mm^2)",&ans.currentDensity);
  ans.Ap = transformerData.IpPhase/ans.currentDensity;
  printf("\n=> Area of Cross Section of HV winding Conductor(theoretical) = %f mm^2",ans.Ap);
  printf("\nEnter the proper Conductor dimensions as per IS:1897-1962 standards(in mm) seperated by a [space] : ");
  scanf("%f %f",&ans.x1,&ans.x2);
  readFloat("Enter the required Insulation(in mm)",&ans.conductorInsulation);
  ans.Ap = ans.x1*ans.x2;
  ans.currentDensity = transformerData.IpPhase/ans.Ap;
  ans.x1 += ans.conductorInsulation;
  ans.x2 += ans.conductorInsulation;

  printf("\n=> Dimensions of Insulated conductors = %f x %f mm",ans.x1,ans.x2);


  printf("\n\n__________For Continuous Disc Winding__________");
  readFloat("\nEnter the value of Maximum Voltage per Disc (in V)",&ans.voltagePerDisc);
  ans.numDiscs = (transformerData.VpPhase*1000/ans.voltagePerDisc);
  printf("\n\n=>Recomended number of Discs = %d\n", ans.numDiscs);
  readInt("Enter the number of discs you require ",&ans.numDiscs);

  ans.turnsPerDisc = (ans.turnsPerPhase/ans.numDiscs);
  printf("\n=>Turns per Disc = %d\n", ans.turnsPerDisc);

  readFloat("Enter the thickness of Bakelized Paper (in mm)",&ans.bakelizedPaper);
  readFloat("Enter the thickness of Spacer (in mm)",&ans.spacer);

  //Axial Depth
  ans.axialDepth = ans.numDiscs * ans.x1 + (ans.numDiscs-1)*ans.spacer;

  //Radial Depth
  ans.radialDepth= ans.turnsPerDisc*ans.x2;

  //Axial Clearance
  ans.clearanceAxial = (transformerData.Window.Hw*1000 - ans.axialDepth)/2;

  //Inner Dia
  ans.Di = transformerData.LV.Do + 2*ans.bakelizedPaper;

  //Outer Dia
  ans.Do = ans.Di + ans.radialDepth;

  //clearance
  ans.clearance = (transformerData.Window.distanceBetweenCores*1000 - ans.Do);

  //Insulation
  ans.insulation = 5 + 0.9*transformerData.VpPhase;



  printf("\n\n _____________HV Dimensions____________\n");
  printf("\n=> Axial Depth of HV Windings = %f mm",ans.axialDepth);
  printf("\n=> Axial Clearance = %f mm ",ans.clearanceAxial);

  printf("\n=> Radial Depth of HV Windings = %f mm",ans.radialDepth);
  printf("\n=> Inner Diameter = %f mm",ans.Di);
  printf("\n=> Outer Diameter = %f mm",ans.Do);

  printf("\n=> Clearance between windings of 2 limbs = %f mm ",ans.clearance);
  printf("\n=> Insulation between HV and LV = %f mm ",ans.insulation);



  return ans;
}

Resistance resistanceCalc(Transformer transformerData){
  Resistance ans;
  float Dm1,Dm2;
  float Lmtp,Lmts;
  float Rs,Rp;

  Dm1 = (transformerData.HV.Di + transformerData.HV.Do)/2;
  Lmtp = pi*Dm1*0.001;//in m
  Rp = (transformerData.HV.turnsPerPhase * 0.021 * Lmtp)/transformerData.HV.Ap;

  Dm2 = (transformerData.LV.Di + transformerData.LV.Do)/2;
  Lmts = pi*Dm2*0.001;//in m
  Rs = (transformerData.LV.turnsPerPhase * 0.021 * Lmts)/transformerData.LV.As;

  ans.absolute = Rp + pow((transformerData.HV.turnsPerPhase/(transformerData.LV.turnsPerPhase*(1+transformerData.maxTappings/100))),2) * Rs;
  ans.pu = (ans.absolute*transformerData.IpPhase)/(transformerData.VpPhase*1000);

  printf("\n=> Total Resistance referred to primary = %f ohm", ans.absolute);
  printf("\n=> Total Resistance referred to primary in p.u. = %f ", ans.pu);

  return ans;
}


Reactance reactanceCalc(Transformer transformerData){
  Reactance ans;
  float Dm;
  float Lmt;
  float Lc;
  float Xp;

  Dm = (transformerData.LV.Di+transformerData.HV.Do)/2;
  Lmt = pi*Dm*0.001; // in m


  Lc = (transformerData.LV.axialDepth + transformerData.HV.axialDepth)/2000;
  Xp = (2*pi*transformerData.frequency*muo*pow(transformerData.HV.turnsPerPhase/(1+transformerData.maxTappings/100),2)*Lmt*(transformerData.HV.insulation+(transformerData.LV.radialDepth+transformerData.HV.radialDepth)/3))/(Lc*1000);
  ans.absolute = Xp;
  ans.pu = (ans.absolute*transformerData.IpPhase)/(transformerData.VpPhase*1000);

  printf("\n=> Total Reactance referred to primary = %f ohm", ans.absolute);
  printf("\n=> Total Reactance referred to primary in p.u. = %f ", ans.pu);



  return ans;
}

Regulation regulationCalc(Transformer transformerData){
  Regulation ans;

  transformerData.Z.pu = sqrt(pow(transformerData.Z.R.pu,2)+pow(transformerData.Z.X.pu,2));

  readFloat("Enter the pf at which Regulation is to be calculated \n +ve for lagging \n -ve for leading ",&ans.pf);

  if(ans.pf>0){ // Lag

    ans.pu = transformerData.Z.R.pu * ans.pf + transformerData.Z.X.pu*sqrt(1-pow(ans.pf,2));



  }else{ // Lead
    ans.pu = -1*transformerData.Z.R.pu * ans.pf - transformerData.Z.X.pu*sqrt(1-pow(ans.pf,2));

  }

  printf("\n\n=> Percentage Regulation = %f",ans.pu*100);


  return ans;
}


Losses lossCalc(Transformer transformerData){
  Losses ans;

  printf("\n_________Copper Loss___________\n");

  ans.CopperLoss = 3*pow(transformerData.IpPhase,2)*transformerData.Z.R.absolute;
  printf("\n=> Copper Loss = %.3f kW",ans.CopperLoss/1000);
  ans.CopperLoss *= 1.15;
  printf("\n=> Copper Loss(considering Stray Load Loss) = %.3f kW",ans.CopperLoss/1000);

  printf("\n\n_________Core Loss___________\n");

  readFloat("Enter the value of Lamination Density (in kg/m^3)",&ans.CoreLoss.lamDensity);

  ans.CoreLoss.limbWeight = 3*transformerData.Window.Hw*transformerData.Core.Ai*ans.CoreLoss.lamDensity;

  readFloat("Enter the specific Core Loss for Limb (in W/kg)",&ans.CoreLoss.limbSpec);
  ans.CoreLoss.limb = ans.CoreLoss.limbWeight * ans.CoreLoss.limbSpec;


  ans.CoreLoss.yokeWeight = 2*transformerData.Frame.W * transformerData.Yoke.Ayoke*ans.CoreLoss.lamDensity;
  readFloat("Enter the specific Core Loss for Yoke (in W/kg)",&ans.CoreLoss.yokeSpec);
  ans.CoreLoss.yoke = ans.CoreLoss.yokeWeight * ans.CoreLoss.yokeSpec;

  ans.CoreLoss.value = ans.CoreLoss.yoke + ans.CoreLoss.limb;

  // printf("\n%f",ans.CoreLoss.value);
  printf("\n\n=> Core Loss = %.3f kW",ans.CoreLoss.value/1000);
  ans.totalLoss = ans.CoreLoss.value+ans.CopperLoss;

  printf("\n\n=> Total Loss = %.3f kW",ans.totalLoss/1000);


  return ans;
}


Tank tankDesign(Transformer transformerData){
  Tank ans;
  ans.H = transformerData.Frame.H + 0.4; // m
  ans.W = 2*transformerData.Window.distanceBetweenCores + (transformerData.HV.Do/1000) + 0.08; // m
  ans.L = (transformerData.HV.Do/1000) + 0.1;
  ans.S = 2*(ans.W+ans.L)*ans.H;

  readFloat("Enter the specific loss dissipiation constant (in W/m^2-*C)",&ans.diss);
  ans.tempRise = transformerData.Losses.totalLoss/(ans.diss*ans.S);

  printf("\n=> Tank Height = %.3f m", ans.H);
  printf("\n=> Tank Width = %.3f m", ans.W);
  printf("\n=> Tank Length = %.3f m", ans.L);




  printf("\n\n=> Temperature Rise = %.2f *C", ans.tempRise);

  return ans;
}

int main(int argc, char const *argv[]) {
  /* code */
  system("cls");
  Transformer transformerData;

  printf("============================\n");
  printf("    TRANSFORMER DESIGN      \n");
  printf("============================\n");

  //_________Initialization________________
  readFloat("Enter the kVA rating(in kVA)",&transformerData.kVA);
  readFloat("Enter the HV Voltage(in kV)",&transformerData.Vp);
  readFloat("Enter the LV Voltage(in kV)",&transformerData.Vs);
  readFloat("Enter the rated frequency(in Hz)",&transformerData.frequency);
  readFloat("Enter the number of phases(1 or 3)",&transformerData.phase);
  readFloat("Enter the tappings(in %)(if no tappings write 0)",&transformerData.maxTappings);
  readInt("Enter the Primary Type\n1. Delta\n2. Star",&transformerData.primaryType);
  readInt("Enter the Secondary Type\n1. Delta\n2. Star",&transformerData.secondaryType);
  //Line Currents
  transformerData.Ip = transformerData.kVA/(sqrt(3)*transformerData.Vp);
  transformerData.Is = transformerData.kVA/(sqrt(3)*transformerData.Vs);

  switch(transformerData.primaryType){
    case 1: // Primary Delta
      transformerData.VpPhase = transformerData.Vp;
      transformerData.IpPhase = transformerData.Ip/sqrt(3);
      break;
    case 2: //Primary Star
      transformerData.VpPhase = transformerData.Vp/sqrt(3);
      transformerData.IpPhase = transformerData.Ip;
      break;
  }

  switch(transformerData.secondaryType){
    case 1: // Secondary Delta
      transformerData.VsPhase = transformerData.Vs;
      transformerData.IsPhase = transformerData.Is/sqrt(3);
      break;
    case 2: //Secondary Star
      transformerData.VsPhase = transformerData.Vs/sqrt(3);
      transformerData.IsPhase = transformerData.Is;
      break;
  }


  //________Core Design__________________

  printf("\n\n============================\n");
  printf("         CORE DESIGN        \n");
  printf("============================\n");
  transformerData.Core = coreDesign(transformerData);

  //_______Window Design_____________
  printf("\n\n============================\n");
  printf("       WINDOW DESIGN        \n");
  printf("============================\n");
  transformerData.Window = windowDesign(transformerData);

  //_______Yoke Design_______________
  printf("\n\n============================\n");
  printf("         YOKE DESIGN        \n");
  printf("============================\n");
  transformerData.Yoke = yokeDesign(transformerData);

  //______Frame Design_______________
  printf("\n\n============================\n");
  printf("         FRAME DESIGN       \n");
  printf("============================\n");
  transformerData.Frame = frameDesign(transformerData);

  //_____LV Winding__________________
  printf("\n\n============================\n");
  printf("            LV DESIGN       \n");
  printf("============================\n");
  transformerData.LV = lvDesign(transformerData);

  //_____HV Winding__________________
  printf("\n\n============================\n");
  printf("            HV DESIGN       \n");
  printf("============================\n");
  transformerData.HV = hvDesign(transformerData);

  //___________Resistance__________________
  printf("\n\n============================\n");
  printf("         RESISTANCE         \n");
  printf("============================\n");
  transformerData.Z.R = resistanceCalc(transformerData);

  //___________Reactance__________________
  printf("\n\n============================\n");
  printf("         REACTANCE         \n");
  printf("============================\n");
  transformerData.Z.X = reactanceCalc(transformerData);

  //___________Regulation__________________
  printf("\n\n============================\n");
  printf("         REGULATION         \n");
  printf("============================\n");
  transformerData.Regulation = regulationCalc(transformerData);

  //___________Losses__________________
  printf("\n\n============================\n");
  printf("         LOSSES         \n");
  printf("============================\n");
  transformerData.Losses = lossCalc(transformerData);

  //___________efficiency__________________
  printf("\n\n============================\n");
  printf("         EFFICIENCY         \n");
  printf("============================\n");
  transformerData.efficiency = transformerData.kVA*1000/(transformerData.kVA*1000 + transformerData.Losses.totalLoss);
  printf("\n\n=> Efficiency at Full Load = %.2f %%",transformerData.efficiency*100);

  //___________Tank__________________
  printf("\n\n============================\n");
  printf("           TANK           \n");
  printf("============================\n");
  transformerData.Tank = tankDesign(transformerData);


  return 0;
}