Recently updated on September 19th, 2024 at 12:15 pm<\/p>","protected":false},"excerpt":{"rendered":"
The research made it possible to identify some causes and dynamics of degradation of the insulation system of underground MV cables which occur in summer, both in dry and moist soil conditions.
\n In order to identify the diagnostic parameters (Partial Discharges and Tand), innovative measurement methodologies were used alongside traditional ones. Particular attention was paid to IoT technology which allows the on-field acquisition of information in almost real time.<\/p>\n","protected":false},"author":93,"featured_media":0,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"tags":[652,1324,1352,1377,1586,1402,1624],"targets":[1317],"rapporti_tipologie":[762],"class_list":["post-191807","rapporti","type-rapporti","status-publish","hentry","tag-active-networks","tag-electricity-network-en","tag-iot","tag-monitoring-and-control","tag-mv-cables","tag-partial-discharges","tag-underground-cables","targets-research","rapporti_tipologie-report-en"],"acf":{"projects":{"ID":191042,"post_author":"464","post_date":"2024-07-10 15:54:47","post_date_gmt":"2024-07-10 13:54:47","post_content":"","post_title":"Components and materials for safety and resilience","post_excerpt":"The project aims to study and research innovative component and material solutions in order to increase the safety and resilience of the electrical system, also through new diagnostic methodologies which are necessary to cope with the new requirements of the grid and the changing environmental stresses to which it is subjected.","post_status":"publish","comment_status":"open","ping_status":"closed","post_password":"","post_name":"components-and-materials-for-safety-and-resilience","to_ping":"","pinged":"","post_modified":"2024-08-09 15:52:10","post_modified_gmt":"2024-08-09 13:52:10","post_content_filtered":"","post_parent":0,"guid":"https:\/\/www.rse-web.it\/progetti\/components-and-materials-for-safety-and-resilience\/","menu_order":0,"post_type":"progetti","post_mime_type":"","comment_count":"0","filter":"raw"},"order_posts":"","dont_show_search":false,"related_posts":false,"dont_show_hompage":false,"show_on_slider":false,"single_post_data":{"titolo_spot":"","post_content":"
The research was focused on the study of the causes and dynamics of the insulating system degradation of both homogeneous and transitional joints made with a self-shrinking technique in MV cable lines, which were directly laid in the ground to increase electricity grid resilience, as well as service reliability and quality for end users.
\nIn the project, two separate test setups were created in succession: the first one allowed analyzing the behavior of the joints in dry soil, simulated using felts, without considering the effect of humidity; in the second one joints were installed inside tanks filled with inert material, compliant with the specifications adopted by the Utilities for directly installing components in the trenches. The focus of the second part was the analysis of the effect of soil humidity (related to atmospheric precipitation) on component functioning, with daily thermal cycles simulating service conditions in summer (i.e., when the failure rate increases).
\nBy analyzing the data from the first test setup (Partial Discharges and Tand), the conclusion was that the degradation dynamics are related to conductor temperature and, in particular, to the critical thermal conditions reached due to climate change. Acquired with both traditional and innovative techniques, these results led to the creation of a new configuration, more similar to the real operating conditions of the cables and joints.
\nBoth configurations include various measurement campaigns carried out offline1 interspersed with periods of online operation2, in which a certain number of daily cycles were applied to the component, set in collaboration with the Unareti Utility and designed not to stress the component beyond the intervention limits of the electricity grid protections, while trying to reproduce the service conditions of the summer period.
\nDuring the online phases the following parameters were monitored: current, voltage, and temperature of the component; humidity and temperature of the ground, which allowed highlighting the triggering and extinction of specific degradation phenomena, both in the heating and cooling phases, in the sections of cable with XLPE insulation.
\nThanks to the experience gained so far, it can be stated that:
\n\u2022 although complying with current legislation, some kits are worse than others;
\n\u2022 the temperature reached in the joints is a function not only of the load request but of the installation and environmental conditions;
\n\u2022 in the presence of dry soil, some joints exceed the temperature limit of the insulation system, triggering an internal phenomenon that is self-sustaining even when reducing the load;
\n\u2022 humidity in the ground favors heat dissipation, helping to maintain the temperature of the component within the limits imposed by the technology;
\n\u2022 humidity helps anticipate the trigger voltage of partial discharge phenomena;
\n\u2022 in the event that the hydrostatic barriers have partially lost their properties, an analysis of the frequency response on the insulating system shows a significant increase in Tand at frequencies lower than 0.1Hz, highlighting a decrease in dielectric properties;
\n\u2022 online monitoring makes it possible to acquire information on the causes of degradation in advance of offline monitoring;
\n\u2022 the implementation of the communication systems of the LoRA prototypes on free frequency and NBIoT on licensed frequency makes it possible to evaluate their reliability and validate new monitoring methodologies;
\n\u2022 the implementation of a prototype tool (demonstrator) for the acquisition of raw data regarding the phenomenon of partial discharges is the first step of an ambitious project, whose aim is to create an advanced diagnostic tool to provide valid support to the electricity distribution provider.<\/p>\n","link_estreno":false,"scarica_file":[{"download_option":"download","file_name":"Download Report","download":{"ID":172725,"id":172725,"title":"21009208","filename":"21009208.pdf","filesize":14653199,"url":"https:\/\/www.rse-web.it\/wp-content\/uploads\/2022\/10\/21009208.pdf","link":"https:\/\/www.rse-web.it\/en\/rapporti\/diagnostica-dei-cavi-interrati-di-media-tensione-risultati-e-valutazione-dellattivita\/attachment\/21009208\/","alt":"","author":"93","description":"","caption":"","name":"21009208","status":"inherit","uploaded_to":172724,"date":"2022-10-25 14:36:14","modified":"2022-10-25 14:36:14","menu_order":0,"mime_type":"application\/pdf","type":"application","subtype":"pdf","icon":"https:\/\/www.rse-web.it\/wp-includes\/images\/media\/document.png"}}],"button":{"text":"","link":""},"referente_group":false,"data_emissione":"2021-12-31","autori":"J. Borghetto, S.L. Chiarello, M. Garotta, L. De Maria (RSE S.p.A.), A. Contin, N. Carbi (UniTS)","rapporto":"","rif_rse":"21009208"},"satellite_post_url":""},"yoast_head":"\n