Aging of insulating materials

Insulation materials will undergo physical phenomena such as polarization, conductance, medium heating, and breakdown under the action of an electric field. While undergoing the action of an electric field, they will also be affected by many factors such as machinery and chemistry. Therefore, many failures of electrical products often occur in the insulating part.

● Electrical aging

       It is more common in high-voltage electrical appliances. The main reason for this is the partial discharge of insulating materials under the action of high voltage.

● Heat aging

       More common in low-voltage electrical appliances, the mechanism is under the action of temperature. The internal components of the insulating material oxidize, crack, and deteriorate, and undergo a hydrolysis reaction with water and gradually lose their insulating properties.

● Environmental aging

      Also known as atmospheric aging, is caused by polluting chemical aging caused by ultraviolet rays, ozone, salt mist, acid and alkali and other factors. among them. UV is the main factor. Ozone is generated by corona or partial discharge of electrical equipment. The aging of the dielectric refers to the phenomenon that the electrical properties and mechanical properties of the dielectric gradually deteriorate with the increase of time during long-term operation. The main aging forms are electrical aging, thermal aging and environmental aging.

How to prevent insulation aging

The aging of the dielectric refers to the phenomenon that the electrical properties and mechanical properties of the dielectric gradually deteriorate with the increase of time during long-term operation. The main aging forms are electrical aging, thermal aging and environmental aging. Once the insulation material is aged, its insulation performance is usually not recoverable. The following methods are commonly used in engineering to prevent the insulation material from aging.

● Add anti-aging agent in the process of making insulating materials.

● Insulation materials for outdoor use can be added with ultraviolet absorber, or use partitions to isolate sunlight.

● Insulation materials used in hot and humid areas can be added with anti-mold agent.

● Strengthen the measures to prevent local corona and partial discharge of electrical equipment.