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China Suppliers Factory for High-Voltage Shielding Cylinders and Vacuum Interrupters
Product description
As the "arc barrier" at the heart of vacuum interrupters, our shield cylinders are engineered with a sophisticated composite structure, combining high-purity oxygen-free copper and special-grade stainless steel. This material combination is no accident: high-purity oxygen-free copper brings exceptional electrical conductivity and heat absorption capabilities, while special stainless steel contributes superior resistance to arc erosion and mechanical durability, ensuring the shield cylinder can withstand the extreme conditions of high-voltage operations.
Composite Structure
Combines high-purity oxygen-free copper and special-grade stainless steel for optimal conductivity, heat absorption, and mechanical durability.
Precision Machining
Formed through precision drawing and refined via CNC milling to achieve a mirror-like finish with a surface roughness of Ra0.4 or lower.
Arc Management
Efficiently absorbs arc energy, uniformizes electric field distribution, and minimizes metal vapor adhesion to prevent insulation breakdown.
To achieve the precision required for such a critical component, we employ advanced manufacturing processes: precision drawing first shapes the metal into the desired cylindrical form, ensuring structural integrity and uniform wall thickness, while subsequent CNC milling refines the inner surface to a mirror-like finish with a roughness of Ra0.4 or lower. This meticulous surface treatment is far more than a cosmetic detail—it plays a pivotal role in the component’s performance.
The ultra-smooth inner wall efficiently absorbs arc energy, preventing excessive heat buildup that could degrade surrounding components. It also helps to uniformize the distribution of the electric field within the vacuum interrupter, reducing the risk of localized field intensification that might lead to insulation breakdown. Furthermore, this high-quality surface minimizes the adhesion of metal vapors generated during arc interruption, which in turn preserves the interrupter’s insulation performance over time. Together, these features not only enhance the vacuum interrupter’s ability to safely and reliably interrupt current but also extend its overall service life, making our shield cylinders an indispensable part of high-voltage power systems.
In response to the equipment requirements of different voltage levels (12kV-550kV), we can customize an integrated structure from the cylinder body to the flange. By optimizing the wall thickness and diversion groove design, we ensure stable vacuum tightness (leakage rate ≤1×10⁻⁹Pa・m³/s) during 100,000 switching cycles.
Leveraging our homologous manufacturing experience with core components such as bellows, the assembly tolerance between the shield cylinder and contacts, as well as insulating pull rods, is strictly controlled within ±0.02mm, perfectly adapting to the overall equipment operating conditions. From spectral inspection of raw materials to helium mass spectrometry leak detection of finished products, the full-process quality control system ensures that every product can withstand the severe tests of high voltage and strong arcs, providing reliable protective support for projects such as smart grids and ultra-high voltage transmission.
Frequently Asked Questions
What materials are used to construct the shield cylinders?
Our shield cylinders feature a composite structure combining high-purity oxygen-free copper and special-grade stainless steel. The copper provides excellent electrical conductivity and heat absorption, while the stainless steel offers superior resistance to arc erosion and mechanical durability.
How is the precision of the inner surface achieved?
We utilize a combination of precision drawing to shape the cylinder and establish uniform wall thickness, followed by CNC milling to refine the inner surface to a mirror-like finish with a roughness of Ra0.4 or lower.
What are the benefits of the Ra0.4 surface roughness?
The ultra-smooth inner wall efficiently absorbs arc energy, uniformizes the electric field distribution to prevent insulation breakdown, and minimizes metal vapor adhesion, thereby preserving the interrupter's insulation performance and extending its service life.
What voltage levels and customization options are supported?
We support equipment requirements across voltage levels from 12kV to 550kV. We can customize integrated structures from the cylinder body to the flange, optimizing wall thickness and diversion groove designs to meet specific requirements.
What are the performance limits for tightness and switching cycles?
Our design ensures stable vacuum tightness with a leakage rate of ≤1×10⁻⁹Pa・m³/s during 100,000 switching cycles.
How is quality control managed for these shield cylinders?
We maintain strict assembly tolerances within ±0.02mm. Our full-process quality control system spans from spectral inspection of raw materials to helium mass spectrometry leak detection of finished products, ensuring reliability under high voltage and strong arc conditions.