Concept of installation of cable terminations on 110–400kV live line poles

Abstract

Modernization and reconstruction projects of overhead lines, ranging between 110 kV and 400 kV, are related to intensive expansion of infrastructure in our country in recent years. It applies in particular to construction of roads, railroads, sports and cultural facilities, including highways, sports stadiums, which leads to installation of cables on various lengths of sections, which frequently enter dense built-up areas of urban agglomerations. Expanded infrastructure, formal-legal regulations cause difficulties to acquire land for overhead lines. Therefore, despite higher costs, projects involve installation of 110kV-400kV cable lines more often than in the past. The most frequent projects involve construction of 110kV cable lines, which cost is nearly twice as high as overhead lines. Installation of cable lines requires high quality installation works, including heads on line poles and support structures of stations. In order to avoid inconvenient outages, electrical companies conduct concept works in order to install heads on live lines. These works are described in this paper. It discusses the principles of occupational safety and the risk involved in this type of works.