ADSS FIBER OPTIC CABLE ON TRANSMISSION LINES

 ADSS is an acronym of All-dielectric Self-supporting Optical Cable. ADSS cable is designed for aerial self supporting application at short, medium and long span distances.
ADSS fiber cables are with the follow characteristics:
1. ADSS cables can be installed without shutting off the power.
2. ADSS cables are excellent AT performance. The maximum inductive at the operating point of AT sheath can reach 12kV.
3. ADSS is light weight and small diameter reducing the load caused by ice and wind and the load on towers and back props.
4. The ADSS cable is large span length and the largest span is over 1000 meters.

ADSS fiber optic cable is loose tube stranded; the tubes are filled with water resistant filling compound. The cable is consists of number of fibers containing tubes or fillers stranded in up layers around a central strength member and bound under a PE jacket. All the fi bers in the cores are filled with water blocking gel. Fillers may be used to preserve the cable geometry.

ADSS cable offers a rapid and economical means for deployment by cable television operators, telephone companies and power utilities. It is adopted for high voltage, middle, small span conditions in Power Transmission System or mazy terrain such as river spanning, mountains.

The actual status of overhead power lines is taken into full consideration when ADSS fiber optic cable is being designed. For overhead power lines under 100kV, PE outer sheath is applied. For power lines equal to or over 110kV, AT outer sheath is applied. The delicate design of Aramid quantity and stranding process of the ADSS cable can meet the demand on various spans.

This guide provides general recommendations for the selection of methods, equipment, and tools for the stringing of Draka Comteq ADSS (All Dielectric Self-Supporting) fiber optic cables including ezSpan and Long Span ADSS cables. The installation methods for Draka’s ADSS cables are essentially the same as those used for installing power utility conductors. The IEEE Guide to the Installation of Overhead Transmission Line Conductors will provide additional relevant information about installation practices. Read more... 

 The use of ADSS cables on transmission lines — at 161 kV and higher — requires a careful approach. It is necessary to determine the optimal position of the ADSS cable on the tower to ensure safe distance from ADSS cable to phase conductors and to ground; to provide safe access to ADSS cable for personnel; and to decrease the electric field, voltage drop and leakage currents along ADSS cable to avoid corona sources and partial discharges on its surface that can damage the polyethylene (PE) cable jacket. Read more... 

 AFL's full line of All-Dielectric Self-Supporting Aerial (ADSS) Cables meet the demanding needs of transmission and distribution environments. This high-capacity cable offers great flexibility for placement on overhead transmission towers, eliminating the need for a support messenger.

ADSS cables feature fiber counts up to 576, a dry core design and the high-tension strength capability required for installation in the toughest environmental and electrical conditions. Unaffected by electromagnetic fields, our ADSS cables can be installed and maintained on extra high-voltage power lines without interruption of power service to customers. Read more... 

 All-dielectric cables separately suspended along high voltage overhead transmission routes are vulnerable to ageing through dry-band arcing. The differences between this process and dry-band arcing on traditional high voltage insulators are reviewed.

Solutions to the problem on all-dielectric self supporting (ADSS) cables which involve the introduction of controlled conductivity into the cable are considered. Analysis suggests that arcs which are both electrically stable and spatially confined must be avoided. It is shown that the cable can be protected by limiting either the current or the voltage available to an arc. These considerations reveal that a semiconductive element does not have to cover the whole cable. Read more... 

OFS' PowerGuide ShortSpan DT cable enables faster deployment and helps lower installation costs through reduced cable preparation time, increased span length capability and flexible buffer tubes for ease of routing and management within closures as compared to similar gel-filled product. 

The 100% gel-free construction allows for light duty attachment hardware costing on average 40 percent less per pole than comparable gel-filled cables on a typical 250 foot span due to lower loaded tension.  Additionally, compared to similar gel-filled cables, up to 60% less labor per dead-end location can be realized by utilizing hardware not requiring reinforcing rods. Read more...

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