As we know, under the load condition, the loss variation of iron core is not too much. However, as the load current of the transformer increases, the increasement of stray magnetic flux is proportional to the load current. The stray magnetic flux penetrates the winding, frame and tank. As a result, ...
As we know, under the load condition, the loss variation of iron core is not too much. However, as the load current of the transformer increases, the increasement of stray magnetic flux is proportional to the load current. The stray magnetic flux penetrates the winding, frame and tank. As a result, it generates eddy current and causes some local heating in specific parts. In order to reduce eddy current induced in the winding conductor and the associated losses, the relative position of each conductor in the winding should be transposed at certain intervals. In the stray magnetic field, the conductors connected in parallel have different positions and can generate different induced voltages. Furthermore, conductors have different lengths, which result in different resistances. All of these factors will cause the potential difference among neighbouring conductors. Consequently, the circulating-current is generated, which will remarkably increase the winding loss. Due to the transposition, the conductor length will be equal to each other during different stray magnetic field, then the conductors in parallel will have same resistances and magnetic leakage flux. Finally, the winding loss resulted from circulating-current will be reduced. Nowadays, due to the existence of many winding techniques, there are a lot of transposition methods for distributed transformers over 500 kVA. Considering the expensive manufacturing cost and power loss increase, it is not available to apply the conventional transposition method, which is suitable for transformers under 100 kVA such as pole type transformer. In this thesis, the loss of transformer is reduced as the effect of transposition for the pole transformer. In addition, the most suitable new transposition method as small core type transformer such as pole transformer is proposed.
As we know, under the load condition, the loss variation of iron core is not too much. However, as the load current of the transformer increases, the increasement of stray magnetic flux is proportional to the load current. The stray magnetic flux penetrates the winding, frame and tank. As a result, it generates eddy current and causes some local heating in specific parts. In order to reduce eddy current induced in the winding conductor and the associated losses, the relative position of each conductor in the winding should be transposed at certain intervals. In the stray magnetic field, the conductors connected in parallel have different positions and can generate different induced voltages. Furthermore, conductors have different lengths, which result in different resistances. All of these factors will cause the potential difference among neighbouring conductors. Consequently, the circulating-current is generated, which will remarkably increase the winding loss. Due to the transposition, the conductor length will be equal to each other during different stray magnetic field, then the conductors in parallel will have same resistances and magnetic leakage flux. Finally, the winding loss resulted from circulating-current will be reduced. Nowadays, due to the existence of many winding techniques, there are a lot of transposition methods for distributed transformers over 500 kVA. Considering the expensive manufacturing cost and power loss increase, it is not available to apply the conventional transposition method, which is suitable for transformers under 100 kVA such as pole type transformer. In this thesis, the loss of transformer is reduced as the effect of transposition for the pole transformer. In addition, the most suitable new transposition method as small core type transformer such as pole transformer is proposed.
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