Select Page

How are bushings manufactured?

Ago 20, 2024

The manufacturing of high-voltage (HV) bushings is a complex and meticulous process that demands precision and expertise. As a leading bushing manufacturer, Hewei takes pride in producing bushings that meet the highest industry standards, ensuring reliable performance in critical electrical applications.The manufacturing of high-voltage (HV) bushings is a complex and meticulous process that demands precision and expertise. As a leading bushing manufacturer, we takes pride in producing bushings that meet the highest industry standards, ensuring reliable performance in critical electrical applications.

The creation of an HV bushing begins with the selection of premium materials. Bushing porcelain is commonly used due to its excellent insulation properties and mechanical strength. The process starts with the careful formulation of the porcelain, which involves mixing specific proportions of raw materials like clay, feldspar, and silica.

The porcelain is dried to eliminate any remaining moisture after it has taken on its shape. This is an important step since the performance of the bushing can be impacted by even minute amounts of moisture. Once the porcelain has dried, it is heated to temperatures that are usually more than 1,200°C in a kiln. The porcelain gains its distinctive strength and insulating qualities through this firing process, which vitrifies the material.

The porcelain body is meticulously examined for flaws and faults following firing. Strict quality control measures guarantee that every component satisfies the demanding specifications for high-voltage applications. The porcelain must next be glazed in order to improve its insulating qualities and shield it from outside elements like pollution and dampness.

For HV bushings, additional components such as metal fittings and conductors are then assembled with the porcelain body. To guarantee tight tolerances and accurate part alignment, precision machining is a necessary step in the final assembly process.

Thorough testing is performed on the constructed bushing to confirm its mechanical and electrical characteristics. These tests include mechanical stress tests, partial discharge measurements and high voltage withstand tests. The aim is to ensure that the bushing operates reliably even in harsh environments.

How does the design of an HV bushing affect its performance in high-voltage applications?

The design of an HV bushing significantly impacts its performance in high-voltage applications, influencing factors such as insulation, durability, and overall reliability. Key design elements that affect performance include:

Insulation System: The insulation design is critical for preventing electrical discharges and ensuring the bushing can handle the high voltages it’s exposed to.

Creepage Distance: The creepage distance—the shortest path between two conductive parts along the surface of the insulation—affects the bushing’s ability to prevent flashovers, especially in polluted or humid environments. A longer creepage distance is designed to improve the bushing’s performance in such conditions, reducing the risk of electrical failures.

Capacitance Grading: HV bushings often include capacitance grading features, such as layers of conductive materials embedded within the insulation. These layers help to evenly distribute the electrical field within the bushing, reducing localized stress and enhancing the bushing’s ability to manage high voltages without degrading over time.

Thermal Management: The design must account for thermal performance, especially in high-current applications where the bushing may be subjected to significant heat. Effective thermal management, through the use of heat-resistant materials and efficient dissipation of heat, ensures that the bushing does not overheat and compromise its insulating properties.

Industry Applications

The HV bushings manufactured by Hewei are widely used in various electrical infrastructures, including transformers, switchgear, and substations. Because of our dedication to quality and innovation, we are able to deliver products that not only meet but also surpass our customers’ expectations, guaranteeing the effective and safe transfer of electrical power.

Being a reputable bushing manufacturer, we are aware of how important bushing porcelain is to HV bushing functionality. We produce goods with unmatched dependability and durability thanks to our sophisticated manufacturing techniques and strict quality control measures.