Introduction to Power Transformers
Transformer is a kind of static electrical equipment used to change AC voltage and current to transmit AC power. It is based on the principle of electromagnetic induction to achieve electrical energy transfer. Transformers can be divided into power transformers, test transformers, instrument transformers and special-purpose transformers for their purposes: power transformers are necessary equipment for power transmission and distribution, power users' distribution; test transformers for electrical equipment withstand voltage (boost) Test equipment; instrument transformers are used for electrical measurement and relay protection of power distribution systems (PT, CT); special-purpose transformers include electric furnace transformers for electric smelting, electric welding transformers, rectifying transformers for electrolysis, and small voltage regulating transformers.
Power transformer is a static electrical device used to change the AC voltage of a certain value into another voltage or current of the same value. device. When the primary winding is energized by alternating current, an alternating magnetic flux is generated, and the alternating magnetic flux is induced by the 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 secondary winding, that is, 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 a measure of the amount of transmitted electrical energy. It is expressed in kVA or MVA. When a rated voltage is applied to a transformer, it is used to determine the rated current that does not exceed the temperature rise limit under specified conditions. The more energy-efficient power transformer is an amorphous alloy core distribution transformer, which has the advantage that the no-load loss value is extremely low. The ultimate assurance of 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.