High voltage transformer refers to the transformer that converts low voltage into high voltage through electromagnetic induction principle. Then let's learn about its classification and working principle!
Classification of high-voltage equipment:
Transformers can be divided into distribution transformers, power transformers, fully sealed transformers, combined transformers, dry-type transformers, oil-immersed transformers and? Single-phase transformer, electric furnace transformer, rectifier transformer, reactor, anti-interference transformer, lightning protection transformer, box transformer, corner transformer, high current transformer, excitation transformer.
Working principle:
Transformer is a device for converting AC voltage, current and impedance. When alternating current passes through the primary coil, alternating magnetic flux is generated in the iron core (or magnetic core), and voltage (or current) is induced in the secondary coil. ? A transformer consists of an iron core (or magnetic core) and a coil. The coil has two or more windings, of which the winding connected to the power supply is called the primary coil and the rest is called the secondary coil.
Ideal transformer:
Regardless of the resistance and iron loss of primary and secondary windings, what is the coupling coefficient? K= 1？ This transformer is called an ideal transformer.
So its structure is like this?
Transformer consists of iron core and primary winding.
1. iron core? Iron core is the main magnetic circuit in transformer. Usually the silicon content is high and the thickness is 0.35? Hmm? . 3mm？ .27? Hmm? Is it made of hot-rolled or cold-rolled silicon steel sheets coated with insulating paint? The iron core is divided into two parts: an iron core column and a cross beam, and a winding is sleeved on the iron core column; Is the bar used to close the magnetic circuit? There are two basic forms of iron core structure: iron core and shell.
2. winding? Winding is the circuit part of transformer. Is it double-wire insulated flat wire or enameled round wire? The basic principle of transformer is electromagnetic induction principle. Taking a single-phase double-winding transformer as an example, this paper explains its basic working principle: when the primary winding is applied with voltage? 1, current flows? 1, alternating magnetic flux is generated in the iron core? 1, these fluxes are called main magnetic flux, and under its action, the windings on both sides induce potentials respectively. 1,? 2. The formula of induced potential is: E=4.44fN? m？ Where: e- effective value of induced potential? F frequency? N turns m- maximum value of main magnetic flux? Because the number of turns of the secondary winding is different from that of the primary winding, the induced potentials E 1 and E2 are also different. When the internal resistance and voltage drop are ignored, the voltage? 1 and? 2 different sizes.
When the secondary side of the transformer is empty, only the current of the main flux flows through the primary side. 0), this current is called excitation current. When there is a load on the secondary side and the load current flows? At 2 o'clock, magnetic flux is also generated in the iron core, trying to change the main magnetic flux, but when the primary voltage is constant, the main magnetic flux is constant, and two parts of current will flow in the primary side, one of which is the excitation current? 0, part of which is used for balance? 2, so this part of the current follows? 2 change and change. The current multiplied by the number of turns is the magnetic potential. ? The above balancing action is essentially a magnetic potential balancing action, and the transformer realizes the energy transfer on the primary side and the secondary side through the magnetic potential balancing action. ? Technical parameters have corresponding technical requirements for different types of transformers, which can be expressed by corresponding technical parameters. For example, the main technical parameters of power transformer are: rated power, rated voltage and voltage ratio, rated frequency, working temperature level, temperature rise, voltage regulation rate, insulation performance and moisture-proof performance. For general low-frequency transformers, the main technical parameters are: transformation ratio, frequency characteristics, nonlinear distortion, magnetic shielding and electrostatic shielding, efficiency and so on.
This is the structure of the high voltage transformer that Bian Xiao introduced to you today? Do you have a new understanding of high voltage transformers? Now China's economy is developing rapidly, and the degree of mechanization is getting higher and higher. People have changed from initial manual labor to mental labor. Replacing our manual work with various machines not only saves people and labor, but also allows machines to help us do things that we are unable to do. Although the high-voltage transformer does not accompany our life like refrigerators and washing machines, its application has also had a certain impact on our life and the development of enterprises. Understanding its structure is helpful to our work and career.
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