Supercomputing Center uses ADSS optical cable ADSS installation

ADSS (All-Dielectric Self-Supporting) optical cables are ideal for aerial installation near high-voltage lines, providing self-supporting, metal-free fiber connectivity for supercomputing centers.

Overview of ADSS Cable

ADSS cables are all-dielectric, self-supporting fiber optic cables that do not contain any metal components, making them suitable for installation near high-voltage power lines without risk of electrical conduction . They are lightweight, rugged, and capable of spanning long distances between towers or poles, often up to 700 meters per span . The internal fibers are protected from strain and environmental factors, with aramid yarns providing tensile strength and the outer sheath offering UV and moisture protection . ADSS cables can carry hundreds of fibers, supporting high-capacity data transmission required for supercomputing centers .

Installation Considerations

Hanging Points and Clearance

• Select hanging points with minimal electric field exposure to reduce electrical corrosion: AT sheath ≤ 25 kV/m for high-voltage lines and PE sheath <12 kV/m for lower voltages .
• Ensure the cable does not collide with conductors, ground wires, or tower structures during wind-induced movement .
• Maintain safe distances from live wires: at least 1.5 meters for 110 kV lines and 3 meters for 220 kV lines .

Tension and Sag

• Use a tension pay-off machine to control traction; avoid exceeding recommended tension to prevent fiber breakage .
• Adjust sag according to span length, wind, ice, and temperature conditions, following sag/tension tables based on NESC and IEEE standards .
• For long spans prone to conductor galloping, dampers may be required to stabilize the cable .

Bending and Twisting

• Maintain a minimum bending radius of ≥30 times the cable diameter during installation and ≥20 times during operation .
• Use anti-twist devices and non-polar insulated ropes to prevent longitudinal twisting, which can damage fibers .

Safety Precautions

• Personnel must follow OSHA, NESC, and local safety regulations .
• Use insulated gloves, safety harnesses, and insulated tools when working near energized lines .
• Avoid installation in wind conditions above level 5 without monitoring personnel .

Cable Types and Selection

• Standard ADSS: Suitable for general aerial installations.
• Aramid-Reinforced ADSS: Enhanced tensile strength for long spans or high wind areas.
• Armored ADSS: Provides additional mechanical protection in aggressive environments.
• Double-Jacketed ADSS: Extra UV and abrasion resistance for harsh outdoor conditions .

Best Practices for Supercomputing Centers

• Install cables on crossbars of high-tension towers or along utility poles to minimize interference and maximize clearance .
• Ensure fiber ends are sealed with waterproof tape to prevent moisture ingress .
• Plan installation to accommodate future expansion, allowing additional fibers or splicing points without compromising sag or tension .
• Regularly inspect for sheath damage, abrasion, or environmental wear, especially in areas exposed to ice, wind, or potential mechanical impact . By following these guidelines, supercomputing centers can deploy ADSS optical cables safely and efficiently, ensuring high-capacity, reliable fiber connectivity in aerial and high-voltage environments.