A distribution power transformer is a static electrical device that is used to convert a certain value of an alternating voltage (current) into another voltage or current of a different value (current). When the primary winding is connected to alternating current, an alternating magnetic flux is generated, and the alternating magnetic flux acts to induce an alternating electromotive force in the secondary winding through the core magnetic conduction. The level of the secondary induced electromotive force is related to the number of turns of the secondary winding, that is, the magnitude of the voltage is proportional to the number of turns. The main function is to transmit electrical energy, so the rated capacity is its main parameter.
The rated capacity is a conventional value for expressing power. It is the size of the transmitted electrical energy. It is expressed in kVA or MVA. When the rated voltage is applied to the transformer, it is used to determine the rated current that does not exceed the temperature rise limit under specified conditions. Nowadays, the more energy-saving power transformer is an amorphous alloy iron core distribution transformer, and its biggest advantage is that the no-load loss value is extremely low. The ultimate in ensuring no-load loss values ​​is a core issue to be considered throughout the design process. When the product structure is arranged, in addition to the effect that the amorphous alloy core itself is not affected by the external force, the characteristic parameters of the amorphous alloy must be accurately and reasonably selected in the calculation. Domestic manufacturers of large power transformers include TBEA, Shandong Mingda, and special transformers.
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