Sometimes people will use step-up transformers, but you may not know the working principle of the step-up transformer and the types of transformers, which is very troublesome when selecting. Here is a brief introduction to introduce the working principle of the step-up transformer and what classification of the transformer.
The working principle of the step-up transformer:
1. The working principle of the step-up transformer is that when the primary coil has an alternating current, an alternating magnetic flux is generated in the iron core (or the magnetic core), so that a voltage (or current) is induced in the secondary coil. The transformer consists of a core (or core) and a coil. The coil has two or more windings. The winding connected to the power supply is called the primary coil, and the other winding is called the secondary coil. In the generator, whether the coil moves through the fixed coil through the magnetic field or the magnetic field, the potential can be induced in the coil. In both cases, the value of the magnetic flux is constant, but the number of magnetic fluxes intersecting the coil is Change, this is the principle of mutual induction. A transformer is a device that uses electromagnetic mutual induction to transform voltage, current, and impedance.
2. According to the principle of electromagnetic induction, when a conductive object is in a changing magnetic field, current can be induced in the electrical conductor. When the transformer is connected to the AC grid, current is input to the primary coil of the transformer, and a magnetic field is generated around the current. As the direction of the input AC current changes continuously, a magnetic field that changes in synchronism with the current is generated, and the generated magnetic field forms a closed loop along the core of the transformer. Since the magnitude and direction of the magnetic field constantly change, a current is induced in the secondary coil. Since the voltages on each coil are equal, the more the number of secondary coil turns, the higher the voltage output from the secondary coil.
3. The working principle of the step-up transformer is to work with the principle of electromagnetic induction. The transformer has two sets of coils, a primary coil and a secondary coil, and the secondary coil is outside the primary coil. When the primary coil is connected to an alternating current, the transformer core generates an alternating magnetic field, and the secondary coil generates an induced electromotive force, and the coil of the transformer is twisted. The number ratio is equal to the voltage ratio.
4, the working principle of step-up transformer and step-down transformer are the same: electromagnetic conversion. When the primary side winding applies an alternating voltage through the alternating current, an alternating magnetic field is induced (the transformer is usually made of a high magnetic permeability material to provide a magnetic circuit), and the alternating magnetic field induces a voltage in the secondary winding. By adjusting the number of turns of the primary winding and the secondary winding, different voltage ratios can be obtained, that is, voltage conversion can be performed, which is the function and working principle of the transformer. There are many types of transformer classification transformers, which can be classified according to their use, structure, number of phases, and cooling method.
Classification of transformers:
1. Classified by purpose: Power transformer. Mainly used in power systems, such as step-up transformers, step-down transformer distribution transformers, tie transformers and plant transformers. Special transformer. Refers to transformers other than power systems, such as voltage regulators, instrument transformers (voltage transformers and current transformers), mining transformers, test transformer rectifier transformers, electric furnace transformers, electric welding transformers and rotary transformers.
2. Classification according to the number of windings: divided into autotransformer, double winding transformer, three winding transformer and multi-winding transformer. Autotransformer: A power system used to connect different voltages. It can also be used as a normal boost or post-down transformer. A two-winding transformer is used to connect two voltage levels in the power system. Three-winding transformers are typically used in power system regional substations to connect three voltage levels.
3. Classification by phase number: It can be divided into single-phase transformer, three-phase transformer and multi-phase transformer. Single-phase transformers are used for single-phase loads and three-phase transformers, and three-phase transformers are used for rise and fall voltages of three-phase systems.
4. Classification according to cooling medium: It can be divided into dry type transformer, oil immersed type transformer and gas filled type transformer. Dry-type transformers rely on air convection for cooling, and are generally used for small-capacity transformers such as local lighting and electronic circuits. Oil-immersed transformers rely on oil as a cooling medium.
5. Classification by cooling method: Taking oil-immersed transformer as an example, it can be divided into oil-immersed self-cooling transformer, oil-immersed air-cooled transformer, oil-immersed forced oil circulating air-cooled transformer, oil-immersed forced oil circulating water cooling transformer and oil. The dip forced oil circulation is directed to the cooling transformer.
6. According to the voltage regulation method: it can be divided into non-excitation voltage regulating transformer and on-load voltage regulating transformer.
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