Transformer is a device that uses the principle of electromagnetic induction to change the AC voltage. The main components are the primary coil, the secondary coil and the iron core (magnetic core). The main functions are: voltage transformation, current transformation, impedance transformation, isolation, voltage regulation (magnetic saturation transformer), etc. According to the use, it can be divided into: distribution transformers, power transformers, fully sealed transformers, combined transformers, dry-type transformers, oil-immersed transformers, single-phase transformers, electric furnace transformers, rectifier transformers, etc.

Transformers In electrical equipment and wireless circuits, transformers are often used for voltage rise and fall, impedance matching, and safety isolation. In a generator, whether the coil moves through the magnetic field or the magnetic field moves through the fixed coil, an electric potential can be induced in the coil. In both cases, the value of the magnetic flux remains unchanged, but the amount of magnetic flux that intersects the coil is different. Change, this is the principle of mutual induction. A transformer is a device that uses electromagnetic mutual induction to transform voltage, current and impedance. In its most basic form, a transformer consists of two sets of coils of wire wound inductively coupled to each other. With the continuous development of the transformer industry, more and more companies have entered the transformer industry, and many companies have come to the fore. For example, Mingyuan Transformer was founded in the early 21st century by a joint venture company. The manufacturer, after nearly ten years of development, has become one of the few advanced technology leaders and pioneers in the industry. The main products are: transformer series (single-phase, three-phase power transformers, single-phase and three-phase autotransformers, machine tool control transformers, starting autotransformers, energy-saving transformers, Scott transformers, three-phase to single-phase, single-phase transformers Three-phase, non-standard transformers such as UPS transformers), reactor series (input and output reactors for frequency converters, DC smoothing reactors, series-parallel reactors, filter reactors, air-core reactors, etc.), filter series (frequency converters Special input filter, output filter, sine wave filter) The products are widely used in electric power, metallurgy, textile, machinery, wind power, steel and other industries, and are well received by customers. When an alternating current (with a known frequency) flows through one set of coils, an alternating voltage with the same frequency will be induced in the other set of coils, and the magnitude of the induced voltage depends on the coupling of the two coils and the magnetic alternating current. degree of chain. Generally, the coil connected to the AC power supply is called the primary coil; and the voltage across this coil is called the primary voltage. The induced voltage in the secondary coil may be larger or smaller than the primary voltage, which is determined by the turns ratio between the primary coil and the secondary coil. Therefore, transformers are divided into step-up and step-down transformers.

Most transformers have a fixed iron core on which primary and secondary coils are wound. Due to the high magnetic permeability of iron materials, most of the magnetic flux is confined in the iron core, so the two sets of coils can obtain a relatively high degree of magnetic coupling. In some transformers, the coil and the core are tightly coupled, and the ratio of the primary and secondary voltages is almost the same as the coil turns ratio of the two. Therefore, the turns ratio of the transformer can generally be used as a reference index for the step-up or step-down of the transformer. Because of this step-up and step-down function, the transformer has become an important accessory of the modern power system. Increasing the transmission voltage makes long-distance power transmission more economical. As for the step-down transformer, it makes the power application more diversified and can In this way, without transformers, the industry cannot achieve the status quo of development.

Transformers are also used for testing. They are called test transformers. They can be divided into gas-filled, oil-immersed, dry-type and other test transformers. They are used by power plants, power supply bureaus and scientific research units for communication. The basic test equipment for the withstand voltage test has passed the standards of the State Quality Supervision Bureau, and is used for the dielectric strength test under the specified voltage for various electrical products, electrical components, insulating materials, etc.