ADSS to Hardex Cost Study -- United Kingdom

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Page 0 of 2 1 +44 (0) 1793 647 200 ADSS to Hardex Cost Study—United Kingdom INTRODUCTION Great Britain based DNO have been considering the use of All-Dielectric Self-Supporting (ADSS) for some time as a replacement for Hardex. This is an efficient, cost effective solution/approach and, moving forward, this DNO decided to change two power circuits from Hardex to ADSS as a technology trial projects. TECHNOLOGY OVERVIEW ADSS—All-Dielectric Self-Supporting Technology very well‐known and very popular for adding the fibre in to the existing overhead infrastructure. ADSS is designed to International Specification IEEE 1222 and is manufactured and tested in accordance with ISO 9001. ADSS is a fully insulated self‐supporting fibre catenary, which can be erected underneath lines up to 500 kV. It is a system that is totally independent and can be installed under live conditions given the correct clearances and procedures. Product (ADSS) considered for replacement of Hardex weighs in the order of 17 kg/100 m and is 15 mm in diameter. Figure 1—ADSS Cable ADSS cable weight = 150‐170 kg/km (approx.) Typical installation tension = 1.7-1.9 kN for span length and sagging allowance given in this specific project Hardex Hardex is a galvanic pilot commonly deployed on 33 kV overhead line OHL or mixed underground (UG) and OHL circuits. It contains metallic elements, therefore applies a significant weight on the pole structures. When Hardex faults occur, protection on the system is depleted and risk can only be mitigated in short time scales by temporary pilot deployment/temporary way‐leaves or repairs using spare cable. Hardex cable is no longer manufactured, therefore replacement or repairs are not possible.

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