Shielding Cylinder For VI And High-Voltage Power Equipment

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.

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.