Transformer material

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Transformer material

To wind a power transformer we must have a certain understanding of the materials related to the power transformer, so I will introduce this knowledge here.

1, core material

The core material used in the power transformer mainly includes iron sheets, low silicon wafers, and high silicon wafers. The addition of silicon in the steel sheet can reduce the electrical conductivity of the steel sheet and increase the electrical resistivity, which can reduce the eddy current and reduce the loss. We usually refer to the silicon-added steel sheet as silicon steel sheet. The quality of the silicon steel sheet used for the quality of the power transformer has a great relationship. The quality of the silicon steel sheet is usually expressed by the magnetic flux density B. The B value of the black iron sheet is generally It is 6000-8000, the low silicon wafer is 9000-11000, and the high silicon wafer is 12000-16000.

2, the material usually used to wind the power transformer

Enameled wire, yarn wrapped wire, wire wrapped wire, the most commonly used enameled wire. For the requirements of the wire, the conductive property is good, the insulating paint layer has sufficient heat resistance, and has a certain corrosion resistance. In general, it is best to use the QZ model of high-strength polyester enamel.

3. Insulation material

In the wound transformer, the isolation between the coil frame layers and the isolation between the windings are all made of insulating materials. The general power transformer frame material can be made of phenolic paperboard, and the interlayer can be isolated by polyester film or telephone paper. Yellow wax cloth can be used for isolation.

4, impregnating materials

After the power transformer is wound, the last process is to dip the insulating varnish, which can enhance the mechanical strength of the power transformer, improve the insulation performance and prolong the service life. Under normal circumstances, cresol varnish can be used as the impregnating material.