How is the insulation treatment of ei transformer core carried out?
Publish Time: 2025-03-04
As a common type of transformer in power electronic equipment, the insulation treatment of the iron core of EI transformer is a key link to ensure the safe and stable operation of the transformer. The insulation treatment of the iron core is not only related to the electrical performance of the transformer, but also directly affects its service life and safety.
EI transformer core is usually made of "E" type and "I" type silicon steel sheets stacked alternately. During the stacking process, strict insulation treatment must be carried out to ensure the electrical isolation between the iron core and surrounding components (such as windings, clamps, etc.). The main purpose of insulation treatment is to prevent short circuits between the iron core and other metal parts, thereby avoiding problems such as current leakage and local overheating.
The insulation treatment process usually includes the following steps:
First, before stacking the silicon steel sheets, the silicon steel sheets need to be cleaned to remove impurities such as oil and rust on the surface. These impurities will not only affect the insulation effect, but may also cause faults such as partial discharge during the operation of the transformer.
Next, select a suitable insulating material. Commonly used insulating materials include insulating paper, insulating paint, etc. Insulating paper has good insulation performance and mechanical strength, and can effectively isolate the iron core from surrounding components. Insulating paint can be applied to the surface of the iron core by dipping, brushing, etc. to form a dense insulating layer.
When stacking silicon steel sheets, insulating paper needs to be placed between each layer of silicon steel sheets to ensure interlayer insulation. At the same time, insulating paper or insulating pads are also required to isolate the iron core from components such as clamps and windings.
After the stacking is completed, in order to further improve the insulation effect, the iron core can be dipped in paint. The entire iron core is immersed in insulating paint so that the paint liquid fully penetrates into the gaps of the silicon steel sheets and the pores of the insulating paper to form a solid insulating layer. After the dip-painting treatment, the iron core needs to be placed in an oven for drying to remove the solvent and moisture in the paint liquid to ensure the drying and curing of the insulating layer.
In addition, during the operation of the transformer, the insulation performance of the iron core needs to be regularly inspected and maintained. By measuring parameters such as insulation resistance and dielectric loss, problems such as insulation aging and moisture can be discovered and dealt with in a timely manner to ensure the safe and stable operation of the transformer.
In short, the insulation treatment of EI transformer core is a complex and important process. By selecting suitable insulation materials, strict insulation treatment process, and regular insulation performance inspection and maintenance, the safe and stable operation of EI transformer can be ensured.
