What is a transformer

Transformer is a static electrical equipment used to transform AC voltage and current to transmit AC power. It realizes electric energy transfer based on the principle of electromagnetic induction. Transformers can be divided into power transformers, test transformers, instrument transformers and special-purpose transformers in terms of their uses: power transformers are necessary equipment for power transmission and distribution and power user power distribution; test transformers can withstand voltage (boost) for electrical equipment Test equipment; instrument transformers are used for electrical measurement and relay protection (PT, CT) of the power distribution system; transformers for special purposes include electric furnace transformers for smelting, welding transformers, rectifier transformers for electrolysis, small voltage regulating transformers, etc.

A power transformer is a stationary electrical device that is used to change a certain value of AC voltage (current) into another or several voltages (current) of the same frequency with different values. When the primary winding is energized with alternating current, alternating magnetic flux is produced, and the alternating magnetic flux passes through the iron core to induce an alternating electromotive force in the secondary winding. The level of the secondary induced electromotive force is related to the number of turns of the primary and secondary windings, that is, the voltage is proportional to the number of turns. The main function is to transmit electric energy, therefore, the rated capacity is its main parameter. Rated capacity is a customary value representing power. It is a representation of the size of the transmitted electrical energy, expressed in kVA or MVA. When a 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. The more energy-saving power transformer is an amorphous alloy iron core distribution transformer, the biggest advantage of which is that the no-load loss value is extremely low. Ultimately, whether the no-load loss value can be ensured is the core issue to be considered in the entire design process. When arranging the product structure, in addition to considering that the amorphous alloy core itself is not affected by external forces, at the same time, the characteristic parameters of the amorphous alloy must be selected accurately and reasonably in the calculation.