A High Frequency Current Transformer is used to measure partial discharge activity in a cast resin MV transformer subject to accelerated
\nthermal\/electrical ageing.<\/p>\n","protected":false},"author":93,"featured_media":0,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"tags":[1324,1300,1704,1608,1379],"targets":[1304,1314,1317],"pubblicazioni_tipologie":[773],"class_list":["post-202966","pubblicazioni","type-pubblicazioni","status-publish","hentry","tag-electricity-network-en","tag-industrial-sector","tag-power-transformers","tag-reliability-and-asset-management","tag-technologies-and-components","targets-industrial-world","targets-press-media-en","targets-research","pubblicazioni_tipologie-isi-article-en"],"acf":{"projects":{"ID":188403,"post_author":"464","post_date":"2024-06-13 15:10:08","post_date_gmt":"2024-06-13 13:10:08","post_content":"","post_title":"Evolution, planning, scheduling and operation of power grids","post_excerpt":"The goal of the project is the pursuit of efficient management of the Italian electricity system that meets, in evolving scenarios, criteria of security and quality of operation, adequacy and resilience, ensuring a system-based approach. ","post_status":"publish","comment_status":"open","ping_status":"closed","post_password":"","post_name":"evolution-planning-scheduling-and-operation-of-power-grids","to_ping":"","pinged":"","post_modified":"2024-07-02 10:31:45","post_modified_gmt":"2024-07-02 08:31:45","post_content_filtered":"","post_parent":0,"guid":"https:\/\/www.rse-web.it\/progetti\/evolution-planning-scheduling-and-operation-of-power-grids\/","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":true,"show_on_slider":false,"single_post_data":{"titolo_spot":"","post_content":"
Dry-type transformers require little maintenance and are more environmentally friendly with respect to traditional oil-and-paper design. However, partial discharges (PDs) and thermal stress may lead to ageing and \u2013 eventually \u2013 failure of the insulation. Diagnostics of their conditions \u2013 often performed by means of PD measurement \u2013 can be tricky, as PD activity depend on many parameters.<\/p>\n
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In this work, a castresin power transformer is aged by means of 28 heating\/cooling thermal cycles, to reproduce the thermal-electrical stress it may experience in operation. PD activity is monitored during the cooling branch of each cycle using a High Frequency Current Transformer to measure the current bled to ground by the transformer shield, whose results are compared to the apparent charge measured by an IEC 60270-compliant commercial system installed on the MV winding.<\/p>\n
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The effect of temperature and ageing (number of cycles) is then investigated. The results show good agreement between the two measuring systems, in terms of both the Phase-Resolved Partial Discharge Patterns and the average intensity trend over time. According to the intensity dependence on temperature, two PD series were identified: one series shows a loose dependence on temperature, the other one a strong dependence.<\/p>\n
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It was speculated that two types of defects may exist, whose geometry (and hence, PD activity) may be affected by temperature to different extent (e.g.: due to their position). Finally, a decrease in PD rate in time was observed, without a significant reduction of the average discharge intensity, which is supposedly due to different ageing rate of different defects.<\/p>\n","scarica_file":false,"link_estreno":[{"link_text":"Download Publication","link":"https:\/\/ieeexplore.ieee.org\/document\/10714414"}],"button":{"text":"","link":""},"referente_group":false,"data_emissione":"2024-10-11","autori":"D. Fasani, G. D\u2019Avanzo, A. Villa, M. Sozzi, L. Barbieri, D. Palladini, G. Buccella, S. Venturini (RSE S.p.A.)","destinazione":"IEEE Transactions on Dielectrics and Electrical Insulation","rif_rse":"24005345"},"satellite_post_url":""},"yoast_head":"\n