A distribution transformer is a static electrical device used in power distribution systems to transform alternating current (AC) voltage and current to transmit AC electrical energy based on the law of electromagnetic induction. In China, transformer products are generally classified by voltage level into ultra-high voltage (750kV and above), extra-high voltage (500kV) transformers, 220-110kV transformers, and 35kV and below transformers. Distribution transformers typically refer to power transformers operating in power distribution networks with voltage levels of 10-35kV and capacities of 6300kVA and below, directly supplying power to end users.
A distribution power transformer is a static electrical device used to transform an AC voltage (current) of a certain value into one or more voltages (currents) of different values but with the same frequency. When AC current is applied to the primary winding, an alternating magnetic flux is generated. This alternating magnetic flux, through the magnetic conduction of the iron core, induces an alternating electromotive force (EMF) in the secondary winding. The magnitude of the induced EMF in the secondary winding is related to the number of turns in both the primary and secondary windings; that is, the voltage is directly proportional to the number of turns. Its main function is to transmit electrical energy; therefore, its rated capacity is its primary parameter. Rated capacity is a conventional value representing power. It is a characterization of the amount of electrical energy transmitted and is expressed in kVA or MVA. When the rated voltage is applied to the transformer, the rated current that does not exceed the temperature rise limit under specified conditions is determined based on it. The more energy-efficient power transformer is the amorphous alloy core distribution transformer. Its biggest advantage is that the no-load loss value is extremely low. Whether the no-load loss value can be ensured is the core issue to be considered in the entire design process [2]. When arranging the product structure, in addition to considering that the amorphous alloy core itself is not subject to external forces, the characteristic parameters of the amorphous alloy must also be accurately and reasonably selected during the calculation. The major domestic manufacturers of power transformers include TBEA, Shandong Mingda, and TBEA Luming Transformer.
