550kV GIS Dry-Type Bushing

We can develop personalized, comprehensive solutions tailored to users' diverse casing requirements. Leveraging advanced production technologies and uniquely designed process equipment, we ensure the stability and consistency of our products, enabling them to maintain a leading position among industry peers. Additionally, our products have demonstrated excellent performance over years of operational experience.

12kV-550kV Dry-Type Capacitor Bushings: A Dual-Reliability Choice—Combining Composite and Porcelain Designs

　　We can develop personalized, comprehensive solutions tailored to users' diverse casing requirements. The company employs advanced production technologies and uniquely designed process equipment, ensuring the stability and consistency of our products—qualities that keep us at the forefront of the industry. Moreover, our products have demonstrated excellent performance over years of reliable operation.

　　The 12kV–550kV dry-type capacitive bushings, serving as critical insulation components in high-voltage power equipment, are categorized into composite and porcelain types based on the material of their housings. Both designs feature a dry-type capacitive core at their heart, leveraging their distinct material properties to deliver outstanding performance in various applications, thereby providing robust support for the stable operation of power systems.

I. Composite Casing-Type Dry Capacitor Bushing

　　The outer layer of the composite sleeve-type dry capacitor bushing is made from a combination of glass-fiber-reinforced resin and silicone rubber umbrella skirts, a material pairing that provides it with numerous advantages.

　　In terms of weight, it is lighter than the porcelain-sleeved type, making installation much easier and reducing the load-bearing pressure on equipment—particularly ideal for scenarios where equipment weight is strictly limited. The silicone rubber umbrella skirt boasts excellent hydrophobic properties and outstanding resistance to pollution flashovers. Even in harsh environments such as areas with frequent fog, high humidity, heavy dust, or coastal salt spray, it effectively minimizes pollutant adhesion and significantly lowers the risk of surface discharge, ensuring stable insulation performance.

　　At the same time, composite materials exhibit excellent aging and corrosion resistance, effectively withstanding erosion from natural elements such as ultraviolet rays and ozone. They boast a long service life and require minimal maintenance costs. Operating within a voltage range of 12kV to 550kV, these materials provide precise compatibility and are commonly used in equipment like switchgear and transformers. Notably, they perform exceptionally well in power projects situated in challenging environments, such as areas with severe pollution or high altitudes.

II. Porcelain Sleeve-Type Dry-Type Capacitor Bushing

　　The outer layer of the porcelain sleeve-type dry capacitor bushing is made from high-quality porcelain material, inheriting the excellent characteristics of traditional porcelain sleeves. Porcelain material boasts exceptionally high mechanical strength, enabling it to withstand substantial conductor weights, short-circuit electromagnetic forces, and external impacts—loads that would typically cause deformation or damage over time. As a result, the bushing maintains outstanding stability even during prolonged operation.

　　Its insulation performance is reliable, with a smooth and dense glaze layer on the surface that effectively prevents current leakage under high-voltage conditions, ensuring safe insulation between the energized internal components and the equipment's outer casing. The porcelain material exhibits excellent thermal resistance, maintaining stable performance across a wide range of temperature fluctuations, making it suitable for extreme climatic environments such as high temperatures, severe cold, and highly corrosive conditions.

　　In large-scale power equipment such as transformers and circuit breakers operating at voltage levels from 12kV to 550kV, porcelain-sleeved dry-type capacitive bushings are widely used. They particularly demonstrate irreplaceable advantages in applications that demand high mechanical strength, superior heat resistance, and excellent corrosion resistance.