Why is the short circuit of the transformer outlet of the electroslag furnace damaged?

According to the situation that the transformer of the electroslag furnace is damaged due to the short circuit of the outlet in recent years, when the transformer is short-circuited, the damage mainly has the following characteristics and causes.

1, the lead is fixed and unstable

This damage is mainly due to the lead oscillation caused by the electromagnetic force between the leads, resulting in a short circuit between the leads, and this kind of accident is rare.

2, Radial instability

This damage is mainly caused by radial electromagnetic force caused by axial flux leakage, resulting in radial deformation of transformer windings, accounting for 41.2% of the entire damage accident.

3, winding or wire cake collapse

This damage is because the wires are squeezed against each other under the action of axial force, resulting in skewed deformation. If the wire is slightly skewed at first, the axial force will promote the increase of skew, and it will collapse in severe cases; if the ratio of the height to width of the wire is large, it will prone to collapse.

4, the line cake is bent and deformed up and down

This damage is because the wire between the two axial spacers is deformed due to the excessive bending moment under the action of the axial electromagnetic force. Generally, the deformation between the two cakes is symmetrical. In addition to the axial weight, the leakage magnetic field at the end, There is also radial weight, and the electromagnetic force generated by the magnetic flux leakage in two directions causes the inner winding wire to turn inward and the outer winding to turn outward.

5, the winding rises to open the pressure plate

This damage is often due to excessive axial force or the existence of its end support strength, insufficient rigidity or defective installation.

6, the winding end is turned over and deformed

In addition to the axial weight, the end leakage magnetic field also has radial weight, and the electromagnetic force generated by the magnetic leakage in the two directions causes the winding wire to turn inward and the outer winding to turn outward.

7, Axial instability

This damage is mainly caused by the axial electromagnetic force caused by radial flux leakage, which leads to transformer failure.

8. The outer winding wire is elongated and the insulation is damaged

The radial electromagnetic force attempts to increase the diameter of the outer winding, and when the tensile stress acting on the wire is too large, it will deform. This deformation is generally accompanied by the damage of the wire insulation, resulting in a short circuit between turns. In severe cases, the coil will be embedded and the coil will collapse. destroyed, or even cracked.