220kV GIS Composite 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—keeping them at the forefront of the industry while delivering excellent performance based on years of operational experience.

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

　　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—products that consistently rank among the industry's leading offerings, backed by years of proven performance.

　　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 Bushing-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 sleeve type, making installation much easier and reducing the load-bearing pressure on equipment—particularly ideal for scenarios where equipment weight is strictly limited. Additionally, the silicone rubber umbrella skirt boasts exceptional hydrophobic properties and outstanding resistance to pollution-induced flashovers. Even in harsh environments such as areas with frequent fog, high humidity, heavy dust, or coastal salt spray, it effectively minimizes pollutant adhesion, significantly lowering the risk of surface discharge and 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 bushing-type dry capacitor bushing is made from high-quality porcelain material, inheriting the excellent characteristics of traditional porcelain bushings. Porcelain 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, it 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-cased dry-type capacitive bushings are widely used. They particularly demonstrate irreplaceable advantages in applications where high mechanical strength, superior high-temperature resistance, and excellent corrosion resistance are critical requirements.