Presentation Description: Underground and submarine power transmission systems are one of the pillars for the transition to renewable resources, which, due to the distances and power to be transmitted, are composed of high voltage ac and dc cables. The success of large-scale wind power generation and any renewable project depends on the financial aspect and the public perception. Both get seriously affected when a transmission line fails. It is impossible to avoid cable faults, but it is possible to repair them in record times, granted, the fault can be located quickly, and logistics are prepared in advance.
Cable fault location (CFL) techniques are well developed for medium voltage installations, however, the cable parameters combined with the lengths of the HV cables, make the conventional CFL techniques inadequate or incapable in underground or subsea high voltage installations.
This poster will discuss different challenges faced by the conventional CFL methods in HV installations, such as impulse propagation and pre-location limitations, to then review the latest advancements in time domain reflectometry and explains new techniques to improve the signal-to-noise ratio, the range resolution, and fault pinpointing strategies, while maintaining the safety for personnel.
An additional objective of this article is to create awareness on the need for specialized and customized equipment or solutions for onshore and offshore transmission lines, which needs ongoing research, development, and consideration from the initial stages of a project. As an example, this article will discuss a solution implemented by the Viking Link project, a 525 kV, 473 miles, HVDC transnational interconnector between United Kingdom and Denmark.
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