Overall dimension

    Width of frame ,W= (2*D+a) = 0.7815 m

     Height of frame,H= H_w+2*H_y = 0.73 m

4.FOR DESIGN OF LOW VOLTAGE WINDING

No of turns /phase ,T_s= (v_s/ph)/E_t

                                        =(433/ )/5.031

                                        50

Secondary phase current ,I_s= (125*10³)/(3*433/ )

                                                  = 166.62A

Area of secondary conductor ,a_s= I_s/ _s

                                                          =166.62/2.35

                                                           = 70.92mm²

Using helical winding and considering 4-strips in parallel with two layer having 25 turns each layer.

We have, area of each strips = 70.92/4

                                                     = 17.73 mm²

From table: with nearly equal area taking the dimension of each strip 6.5*2.6 mm²

Total area of conductor = 6.5*2.6*4   =67.6mm²

Actual current density , _s= 166.67/67.6

                                               = 2.465mm²

Taking insulation 0.5mm

The dimension of each strip =7mm*3.1mm

Axial depth of one turn =2*7+1

                                           =15mm

Radial depth of one turn = 2*3.1+1

                                              =7.2mm

For helical winding ,taking one extra turn in axial depth

Total turns per layer =25+1= 26

Total axial depth of Lv winding ,L_cs= 15*26

                                                              =390mm

Now, clearance of each side winding  = (Ht of winding –L_cs)/2                                                                              

                                                                  = (417-390)/2 = 13.5mm

As minimum clearance is 6mm, thus the arrangement is acceptable .

Total radial depth of Lv winding (b_s)  =No of layers *Radial depth of each turn +

                                                                       Insulation between layers

                                                                    =2*7.2*0.5

                                                                     =14.9mm

inside diameter of LV winding = d+2*thickness of insulation betⁿ core &winding

                                                       =174+2*1.5

                                                        =177mm

Outside diameter of LV winding,d_outer=d_inner+2*Radial depth of LV

                                                                   =177+2*14.9

                                                                    =207mm

Mean diameter of LV winding =(d_inner + d_outer )/2

                                                        =(177+207)/2

                                                         =192.15mm

Mean length of LV winding =  *d_mean

                                                  =192.15*

                                                   =603.65mm