What Potential Risks Will The Cracks in The Transformer Bushing Bring?

Cracks in the bushing of a three-phase dry-type transformer will bring the following potential risks:

Insulation performance reduction: Cracks in the bushing of a dry-type transformer will reduce the insulation strength, which may cause further damage to the insulation until it is completely broken down. When the water in the crack freezes, the bushing may also burst.

Changes in the electric field distribution: Cracks will change the electric field distribution. The cracks are filled with air, and the dielectric constant of air is small, which will increase the electric field strength and easily cause partial discharge or even breakdown. In addition, cracks will shorten the original shed bending spacing and reduce the flashover voltage.

 

Decrease in heat dissipation capacity: Cracks will reduce the heat dissipation capacity of the bushing. Local discharge will increase the temperature of the porcelain bushing, further aggravate the expansion of the cracks, and may eventually cause the bushing to burst.

Increase in safety hazards: Cracks in the bushing may cause problems such as short circuits and overloads, and even cause serious accidents such as fires or explosions, threatening personal safety and normal operation of equipment.

Prevention and treatment measures:

Regular inspection: Regularly inspect the appearance of the transformer to detect and handle cracks in a timely manner. ‌Maintenance‌: Keep the transformer clean to prevent dirt accumulation and moisture intrusion.