How do self-supporting aerial cables ensure rock-solid stability in high-voltage power transmission at all levels?
Publish Time: 2025-11-17
In modern power grid construction, reducing operation and maintenance costs while ensuring safety and improving efficiency is a core challenge facing power systems. Self-supporting aerial cables (especially ADSS—all-dielectric self-supporting optical cables) are becoming the "smart nerves" integrating communication and power monitoring in high-voltage transmission lines, thanks to their unique structural design and material advantages. They not only eliminate the need for additional supporting steel cables but also provide stable, reliable, and long-life operation guarantees for 10kV to 220kV transmission lines with superior mechanical performance, environmental adaptability, and ease of installation.1. Power-off-free installation, significantly improving construction efficiency and power supply continuityTraditional overhead optical cables rely on power lines or additional catenary cables, making construction complex and often requiring power outages, impacting user experience. ADSS self-supporting aerial cables, with their all-dielectric, self-supporting structure, can be directly suspended from existing power poles, allowing installation without interrupting power supply. This not only shortens the construction period and reduces coordination difficulties, but also significantly improves the availability of the power grid and customer satisfaction, making it particularly suitable for scenarios with high requirements for power supply continuity, such as urban distribution network renovation and mountain line upgrades.2. AT Sheath Enhancement: Resisting Tracking Erosion under Strong Electric FieldsNear 110kV and above high-voltage lines, the spatial electric field strength is extremely high. Ordinary polyethylene sheaths are prone to tracking due to partial discharge, ultimately leading to sheath cracking and failure. Therefore, ADSS optical cables mandate the use of anti-tracking sheath materials for high-voltage lines. This material has excellent resistance to leakage tracking, effectively resisting corona discharge and surface carbonization, ensuring long-term stable operation in strong electric field environments. For 10kV and 35kV lines, economical PE sheaths can be selected, optimizing costs while meeting safety requirements.3. Lightweight Design: Reducing Tower Load and Enhancing Disaster ResistanceADSS optical cables use high-strength aramid fibers as tensile elements, combined with precision stranding technology, achieving advantages of light weight and small wire diameter while ensuring excellent tensile strength. Compared to traditional metallic optical cables, its weight per unit length is reduced by more than 30%, significantly reducing the static and dynamic load on towers and supports. In extreme weather conditions such as snow and typhoons, the smaller windward surface and low icing adhesion further enhance the line's wind and ice resistance, reducing the risk of tower collapse and line breakage.4. Ultra-long span capacity, adaptable to complex terrain deploymentThanks to its aramid-reinforced structure and optimized tension-sag characteristics, ADSS optical cables can achieve a maximum span exceeding 1000 meters, easily crossing rivers, valleys, highways, and other obstacle areas, reducing the number of intermediate towers and significantly lowering project costs. Simultaneously, its excellent temperature characteristics ensure dimensional stability in cold or hot regions, avoiding sudden tension changes caused by thermal expansion and contraction.5. 30-year long service life, building the cornerstone of a green and smart gridADSS optical cables adopt a non-metallic all-dielectric structure, eliminating the risk of lightning strikes and are corrosion-resistant and rodent-proof, with an expected service life of up to 30 years. Its built-in optical fiber enables real-time transmission of line status data, supporting intelligent inspection, fault location, and load monitoring, providing a communication foundation for building a new type of power system that is "observable, measurable, and controllable."Self-supporting aerial cables are not only physical "power arteries" but also "information bridges" for the digital power grid. Through power-off-access installation, AT sheath protection, lightweight high-strength structure, and ultra-long span capability, they ensure the safe and stable transmission of high-voltage power while empowering the intelligent upgrading of the power grid. With the accelerated construction of new power systems, high-performance self-supporting aerial cables such as ADSS will undoubtedly play an increasingly crucial role in energy transformation and the Digital China strategy.
