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Industry Knowledge: Basic Concepts of Electric Furnace Transformers
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Industry Knowledge: Basic Concepts of Electric Furnace Transformers
News Source: 2012-07-17 16:38:18

If the loss of the transformer is not considered, the power consumed by an ideal transformer secondary load can be considered as the electric power obtained from the power supply by the primary. The electric furnace transformer can change the secondary voltage by changing the number of turns of the secondary coil as required, but it cannot change the power allowed by the load. When the primary winding of the transformer is energized, the magnetic flux generated by the coil flows in the core. Because the core itself is also a conductor, an electric potential is induced on a plane perpendicular to the magnetic field lines. This potential forms a closed loop on the section of the core and generates a current. It looks like a vortex so it is called "vortex". This "eddy current" increases the loss of the transformer and increases the temperature rise of the core heating transformer of the mine furnace transformer .

The losses caused by "eddy currents" are called "iron losses". In addition, winding a transformer requires a large amount of copper wire. These copper wires have resistance. When the current flows through the electric furnace transformer, this resistance will consume a certain amount of power. This part of the loss often becomes heat and is consumed. We call this loss " Copper loss. " Therefore, the temperature rise of the arc furnace transformer is mainly caused by iron loss and copper loss.

For electric furnace transformers, the core materials used are mainly iron, low silicon, high silicon, and the addition of silicon to steel can reduce the conductivity of the steel and increase the resistivity. It can reduce eddy currents and reduce losses. We usually call silicon-added steel sheets as silicon steel sheets. The quality of silicon steel sheets used in transformers has a great relationship. The quality of silicon steel sheets is usually expressed in terms of magnetic flux density B. The requirements for wires are conductive properties Well, the insulating lacquer layer has sufficient heat resistance and must have certain corrosion resistance.

In the winding transformer, the insulation between the layers of the coil frame and the isolation between the windings must use insulating materials. The general transformer frame material can be made of phenolic paperboard, and the layers can be isolated by polyester film or telephone paper. Can be used for isolation. After the electric furnace transformer is wound, the last step is to pass through the impregnated insulating varnish, which can enhance the mechanical strength of special transformers, improve the insulation performance and extend the service life. Generally, cresol varnish can be used as the impregnating material.

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