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Energy losses’ reduction in metallic screens of MV cable power lines and busbar bridges composed of single-core cables
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Institute of Electric Power Engineering Poznan University of Technology ul. Piotrowo 3a, 60-965 Poznań, Poland
Publication date: 2020-03-31
Eksploatacja i Niezawodność – Maintenance and Reliability 2020;22(1):15-25
The growing share of medium voltage cable lines in distribution networks challenges distribution network operators in terms of proper mode of operation of these lines. It is related to the reduction of energy losses in cable conductors and metallic cable screens. The article focuses on energy losses in metallic cable screens of cable lines and substation busbar bridges composed of single-core cables with metallic screens and possible ways of their reduction. Simulation and measurement analysis of the level of energy losses in the metallic screens of cables is presented together with the economic analysis of various variants of losses reduction through the change of the way these screens are operated in relation to the traditional bilateral earthing at both ends of cable. Technical problems and threats connected with the use of considered modifications of metallic screens operation during earth fault disturbances in distribution networks are also presented
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