The Working Principle and Composition Material of Three Phase Coherent Type Transformer

3 phase coherent type transformer is the main component of various power supply and electrical equipment. It is the use of electromagnetic induction principle to change the ac voltage device, the main component is the primary coil, secondary coil and core (core). In electrical equipment and wireless circuits, commonly used for voltage rise and fall, matching impedance, safety isolation. In a generator, whether the coil moves through the magnetic field or the magnetic field moves through the fixed coil, the potential can be induced in the coil. In both cases, the value of the magnetic flux remains unchanged, but the number of magnetic flux intersecting the coil chain changes, which is the principle of mutual inductance. A transformer is a device that uses electromagnetic mutual inductance to transform voltage, current and impedance. The main principle of work is the principle of electromagnetic induction, to use the electromagnetic mutual inductance to complete conversion voltage, current and impedance.

the core materials used in 3 phase coherent type transformer mainly include iron sheet, low silicon sheet and high silicon sheet. The addition of silicon into the steel sheet can reduce the conductivity and increase the resistivity of the steel sheet, which can reduce eddy current and reduce its loss. The quality of the silicon steel used in the transformer has a huge relationship with the quality of the silicon steel. The quality of the silicon steel is usually represented by the magnetic flux density B. Generally, the B value of the black iron sheet is 6000-8000, the low silicon sheet is 9000-11,000, and the high silicon sheet is 12,000-16,000.

Enameled wire, sandbag wire, silk-covered wire and the most commonly used enameled wire are commonly used for winding transformers. The requirement for wires is good conductivity, insulation paint layer has enough heat resistance, and must have a certain degree of corrosion resistance. In general, it is better to use Q2 type of high strength polyester enameled wire.

in the winding transformer, insulation material should be used for the isolation between the coil frame layer and the winding resistance layer. The general 3 phase coherent type transformer frame material can be made of phenolic cardboard, the layer can be made of polyester film or telephone paper, and the winding resistance can be made of yellow wax cloth.

After the transformer winding, there’s also the last process, is the impregnation insulation paint, it can enhance the mechanical strength of the transformer, improve the insulation performance, extend the service life, in general, can use cresol varnish as impregnation material.