The principle of the transformer The 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). In electrical equipment and wireless circuits, it is often used for voltage rise and fall, impedance matching, safety isolation, etc. In a generator, an electrical potential can be induced in the coil, whether the coil moves through a magnetic field or the magnetic field moves through a stationary coil. In both cases, the value of the magnetic flux is unchanged, but the amount of magnetic flux that intersects with the coil changes, which is the principle of mutual induction. A transformer is a device that uses electromagnetic mutual induction to transform voltage, current and impedance. The components of the transformer include the body (iron core, winding, insulation, lead wire), transformer oil, oil tank and cooling device, pressure regulating device, protection device (hygroscopic device, safety air passage, gas relay, oil conservator and measuring device) temperature device, etc.) and outlet bushings. Specific composition and function: (1) iron core. The iron core is the main part of the magnetic circuit in the transformer. It is usually composed of hot-rolled or cold-rolled silicon steel sheets with high silicon content, thicknesses of 0.35mm, 0.3mm, and 0.27mm, and coated with insulating paint on the surface. The iron core is divided into two parts: the iron core column and the horizontal piece, and the iron core column is sleeved with windings; the horizontal piece is used to close the magnetic circuit. (2) Winding. The winding is the circuit part of the transformer, which is wound with double-wire insulated flat wire or enameled round wire. The basic principle of a transformer is the principle of electromagnetic induction. Now, a single-phase two-winding transformer is used as an example to illustrate its basic working principle: when a voltage U1 is applied to the primary side winding, a current I1 flows, and an alternating magnetic flux is generated in the iron core. O1, these magnetic fluxes are called main magnetic fluxes. Under its action, the windings on both sides induce potentials respectively, and then Z drive the transformer regulating device.