Introduction to Distribution Transformers

Distribution transformers refer to static electrical equipment used in distribution systems to transform AC voltage and current according to the law of electromagnetic induction for the transmission of AC electrical energy.

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 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 stationary electrical device used to convert an alternating voltage (current) of a certain value into another or several different alternating voltages (currents) of the same frequency.

When an alternating current is applied to the primary winding, an alternating magnetic flux is generated. Through the magnetic conduction effect of the iron core, an alternating electromotive force is induced in the secondary winding. The magnitude of the induced electromotive force in the secondary winding is related to the number of turns in 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, so the rated capacity is its main parameter. The rated capacity is a conventional value representing power, which indicates the size of the transmitted electrical energy and is expressed in kVA or MVA. When the rated voltage is applied to the transformer, the rated current is determined based on it under specified conditions without exceeding the temperature rise limit.

The most energy-efficient power transformer is the amorphous alloy core distribution transformer, whose greatest advantage is its extremely low no-load loss value. Whether the no-load loss value can be ensured is the core issue to be considered throughout the design process. When arranging the product structure, in addition to ensuring that the amorphous alloy core is not subjected to external forces, the characteristic parameters of the amorphous alloy must also be accurately and reasonably selected during the calculation.