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Power transformer core function

2019-04-03 11:00:01

The actual transformer always works in ac state, and the power loss is not only in the resistance of the coil, but also in the core magnetized by alternating current.The power loss in the iron core of power transformer core is usually called "iron loss", which is caused by two reasons, one is "hysteresis loss", the other is "eddy current loss".

Hysteresis loss is the iron loss caused by hysteresis phenomenon in the magnetization process of power transformer core. The size of this loss is proportional to the area surrounded by hysteresis loop of the material.The ferromagnetic hysteresis loop of silicon steel is narrow, and the ferromagnetic loss of the power transformer core is small, so the heating degree can be greatly reduced.

Since silicon steel has the above advantages, why not use the whole piece of silicon steel as the core, but also to process it into sheets?

This is because the flaky core reduces another type of iron loss, the "eddy current loss".When the transformer works, there is an alternating current in the coil, and the flux it produces is of course alternating.

The changing flux generates an induced current in the power transformer core.The induced current generated in the iron of a power transformer core circulates in a plane perpendicular to the magnetic flux, so it is called eddy current.

Eddy current losses also heat the power transformer core.In order to reduce the eddy current loss,the power transformer core is overlapped with insulated silicon steel sheets, so that the eddy current is in a narrow and long loop and passes through a small section to increase the resistance on the eddy current path.At the same time, the silicon in the silicon steel increases the resistivity of the material and also plays a role in reducing the eddy current.

Used as power transformer core, generally choose,For cold rolled silicon steel sheet of 0.35mm thickness, cut it into long shaped pieces according to the required size of the iron core, and then fold them into the shape of "day" or "mouth".

In principle, if the eddy current is reduced, the thinner the silicon steel sheet, the narrower the spliced strip, the better the effect.This not only reduces the eddy current loss and the temperature rise, but also saves the material for the silicon steel sheet.

But in fact when making silicon steel core.Not only from the above favorable factors, because making the core in that way, will greatly increase labor hours, but also reduce the effective section of the core.Therefore, when making power transformer core with silicon steel sheet, it is necessary to start from the specific situation, weigh the advantages and disadvantages, and choose the best size.

The transformer is made according to the principle of electromagnetic induction. There are two windings, a primary windings and a secondary windings, on the closed power transformer core pillar. When the primary windings are added with the ac power supply voltage.

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