Digital Star

Technical Papers

Discover more about the energy issues through the technical papers written by our experts
23 . 12 . 2015
Uberto Vercellotti
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On the way to compare the polarity reversal withstand capability of HVDC mass-impregnated and extruded cable systems
​The reversal of voltage polarity is essential in HVDC cablesystems with Current Source Converters (CSC), since it enables to revert the direction of the power flow. Mass Impregnated Non-Draining (MIND) cables are known tobe able to withstand the voltage polarity reversal without particular problems. TERNA, the Italian Transmission System Operator (TSO), has introduced since many […]
31 . 08 . 2015
Klaus Vaterrodt
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Optical PD detection in high voltage cable accessories
Optical partial discharge detection is a new method to perform diagnosis of the insulation system detecting optical signals which are coming up at the same time.This method does not work with the electrical signals which are caused in case of partial discharges though. On the basis of this different physical process, external electrical noise can […]
16 . 04 . 2015
Uberto Vercellotti
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Safety issues in case of internal arc on HV cable terminations, bushings
Worldwide demand for new T&D networks will increase in the near future pushing the utilities to install a larger number of high voltage equipment like cable terminations, bushings and surge arresters. Meanwhile the attention to environmental and safety issues is generally increasing. The aim of this paper is to analyze the potential risks associated with […]
27 . 08 . 2012
HVDC link Sardinia Island
The essential characteristics and the steps followed in the realization process of the new ±500 kV 1000MW HVDC link Sardinia Island – Italian Peninsula (SAPEI), whose completion was achieved at theend of 2010, are presented in this paper. Notwithstanding the growing application of HVDC links around the world and the acquiredexperience in the area of […]
06 . 04 . 2010
Stefano Malgarotti
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Linking Europe to Africa through long distance HVDC submarine interconnectors: methodology applied to the feasibility study and technical challenges to be overcome
HVDC  links  are  becoming  an  increasingly  popular  solution  to  interconnect  previously  isolated systems or to establish new corridors within highly meshed networks. As a matter of fact, HVDC links show outstanding advantages with respect to HVAC corridors such as full controllability of power flow avoiding the creation of parallel or, even, loop flows in meshed […]