How can power cables with metal shield maintain their shielding effectiveness under harsh environmental conditions?
Publish Time: 2025-01-15
Maintaining the shielding effectiveness of power cables with metal shield under harsh environmental conditions is a key technical issue.1. Material selectionHighly conductive materials: Select metal materials with excellent conductivity as the shielding layer, such as copper or aluminum, to ensure good electromagnetic shielding effect.Corrosion-resistant materials: In corrosive environments, select corrosion-resistant metal materials, such as stainless steel or galvanized copper, to prevent the shielding layer from failing due to corrosion.Protective coating: Apply a protective coating such as polyurethane or epoxy resin on the surface of the shielding layer to enhance the ability to resist corrosion and mechanical damage.2. Shielding layer designComplete shielding layer: Ensure that the shielding layer is complete without gaps, covering the entire length of the power cord to prevent electromagnetic waves from entering or leaking through the gaps.Double-layer shielding: In some high-demand occasions, a double-layer shielding structure is used, with the inner layer being a metal layer with good conductivity and the outer layer being a metal layer with strong corrosion resistance to improve shielding effectiveness and durability.Braiding density: For the braided shielding layer, ensure that the braiding density is high enough to provide sufficient shielding effectiveness. The commonly used braiding density standard is more than 85%.3. Correct installation and connectionGood grounding: Ensure that the shielding layer is well connected to the grounding point of the equipment to form a low-impedance grounding loop and effectively conduct interference current.Termination treatment: Use special shielding terminators or shielding connectors at both ends of the power cord to ensure that the shielding layer is not interrupted at the connection.Avoid bending and stress: During installation, avoid excessive bending and mechanical stress on the shielding layer to prevent damage or breakage of the shielding layer.4. Environmental protection measuresWaterproof and moisture-proof: In humid environments, use waterproof connectors and waterproof sealants to ensure that the connection and shielding layer are not intruded by moisture.Anti-ultraviolet: In outdoor or direct sunlight environments, choose a protective coating with anti-ultraviolet properties to prevent material aging.Mechanical protection: In environments where mechanical damage may occur, use a sheath or protective tube to provide additional protection for the shielded power cord.5. Regular inspection and maintenanceAppearance inspection: Regularly check the appearance of the shielding layer to see if there is corrosion, damage or breakage.Performance test: Use professional testing equipment to regularly test the shielding effectiveness to ensure that it remains within the design value range.Cleaning and maintenance: Regularly clean the dirt and corrosion on the surface of the shielding layer, and repair the coating or replace the damaged part when necessary.6. Optimize design and manufacturing processSeamless connection: During the manufacturing process, ensure the seamless connection of the shielding layer to reduce electromagnetic leakage at the joints.Tight wrapping: By optimizing the manufacturing process, the shielding layer tightly wraps the conductor of the power cable to reduce the penetration of electromagnetic waves.Quality control: Implement strict quality control throughout the production process to ensure that each shielded power cable meets the design requirements.The above methods and technologies can effectively improve the shielding effectiveness of power cables with metal shield under harsh environmental conditions and ensure its stability and reliability in various applications.
