## 4 Simulations Results
Figure 3 shows the no-load losses when the secondary winding changes. The x-axis shows the number of turns of the secondary winding side was changed from 30 turns to 38 turns while the y-axis shows the no-load loss from the secondary winding changing. In addition, the x-axis also shows the value 38* and 38** turns with a calculation of the suitable value and the final adjustment value for the production, respectively. It was found that the maximum and minimum no-load loss was about 9074 W and 9030 W, respectively. However, it was found that the secondary winding side at 38* and 38** was about 9050 W and 9060 W, respectively. Figure 4 shows the secondary coil loss when the secondary winding changes. The x-axis shows the number of turns of the secondary winding under the same conditions as in Figure 3, while the y-axis shows the secondary coil loss. It was found that the secondary coil loss was stable when the number of turns was 30 turns to 36 turns. In addition, it was observed that secondary coil loss tended to increase when the number of turns of the secondary winding was more than 37 turns. Thus, it was confirmed that when the number of turns of the secondary winding was 38* and 38** it resulted in the secondary coil loss being about 17,300 W and 17,600 W, respectively. The secondary coil loss was higher due to the increased number of turns on the secondary side. Figure 3: The no-load loss when the secondary winding changes. Figure 5 shows the primary coil loss when the secondary winding changes. The x-axis shows the number of turns of the secondary winding under the same conditions as in Figure 3, while the y-axis shows the primary coil loss. It was found that the maximum and minimum of the primary coil loss was about 21,000 W and 20,500 W, respectively. Initially, primary coil loss decreased when changing the number of secondary turns from 30 to 32. After that, it was found that the primary coil loss was stable when the number of secondary coils was 33-38* turns, in which the primary coil loss was between about 25,000-25,800 W. Finally, when the number of secondary windings changed from 38* turns to 38** turns,  
Figure 4: The secondary coil loss when the secondary winding changes. Figure 5: The primary coil loss when the secondary winding changes. the primary coil loss was increased again, which confirmed that the primary coil loss was about 21,000 W when the number of secondary windings was 38** turns. Figure 6 shows the lead wire loss when the secondary winding changes. The x-axis shows the number of turns of the secondary winding under the same conditions as in Figure 3, while the y-axis shows the lead wire loss. It was found that the maximum and minimum lead wire losses were about 1100 W and 950 W, respectively. In addition, it was observed that the trend of the graph decreases when the number of secondary coils increases from 30 turns to 38 turns. However, it was found that the lead wire loss was increased again from conditions of calculating the suitable value and final adjustment for the production with 38* turns and 38** turns, for which the lead wire loss was about 980 W.  
Figure 7 shows the total loss when the secondary winding changes. The x-axis shows the number of turns of the secondary winding under the same conditions as in Figure 3, while the y-axis shows the total loss. It was observed that the total loss was stable when the number of secondary coils was 30 turns to 38 turns, which in this period the maximum total loss and minimum total loss were about 50,900 W and 50,400 W, respectively. Nonetheless, it was found that the total loss increased when the number of secondary coils was 38* turns and 38** turns. Especially, the maximum total loss of this graph was about 51,500 W from the number of secondary coils at 38** which was a result of the summation of all losses in the transformer. However, this maximum total loss was an acceptable range for the IEC 60076 standards. Figure 8 shows the percentage impedance when the secondary winding changes.