AC Creeping Flashover Characteristics of Oil-Paper Interface Caused by Floating Discharge Under Parallel Component

AC Creeping Flashover Characteristics of Oil-Paper Interface Caused by Floating Discharge Under Parallel Component | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Research Article AC Creeping Flashover Characteristics of Oil-Paper Interface Caused by Floating Discharge Under Parallel Component Qinglin Yang, Li Cheng, Bo Tao This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-6937277/v1 This work is licensed under a CC BY 4.0 License Status: Under Review Version 1 posted 7 You are reading this latest preprint version Abstract Floating discharge was a typical fault in oil-immersed power transformers. Test models used in previous research were primarily simple vertical components, mainly simulating the barrier area. However, in the actual operation of transformers, areas with parallel components (such as the angle ring region) were equally critical. While the creeping flash-over characteristics of parallel components had been relatively well understood, studies on creeping flashover of the oil-paper interface caused by floating discharge under parallel components were limited. To investigate the flashover characteristics and processes, this study designed a test model featuring multi-ring electrodes and copper sheet floating electrodes. AC flashover tests were conducted on insulating pressboard subjected to floating discharge. The results showed that, for creepage distances of 60- 80 mm, the flashover voltage increased linearly with the creepage distance, while the average failure field strength fluctuated slightly around 3.54 kV/mm. Using a combination of macroscopic and microscopic analysis, the distinct asymmetry of damage on both sides of the suspended electrode was characterized. Additionally, high-speed imaging recorded the flashover process, including streamer discharge, from both perpendicular and parallel perspectives of the pressboard. This study clarified the entire flashover process, which included the stream-er discharge stage, the through discharge stage, and the complete flashover stage. Through finite element modeling of the corresponding stages and analysis of the carrier generation mechanism during streamer discharge, the intrinsic relationship between pressboard trace characteristics and the flashover process was elucidated. Overall, these findings are helpful for understanding the development of floating discharge and creeping discharge process under parallel component Floating discharge Creeping flashover Streamer discharge Oil-paper insulation Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Under Review Version 1 posted Editorial decision: Revision requested 05 Nov, 2025 Reviews received at journal 22 Jul, 2025 Reviewers agreed at journal 17 Jul, 2025 Reviewers invited by journal 11 Jul, 2025 Editor assigned by journal 26 Jun, 2025 Submission checks completed at journal 21 Jun, 2025 First submitted to journal 20 Jun, 2025 You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. 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Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-6937277","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":484416404,"identity":"a405a583-e333-490e-99f3-043c0bd8b895","order_by":0,"name":"Qinglin Yang","email":"","orcid":"","institution":"Chongqing University","correspondingAuthor":false,"prefix":"","firstName":"Qinglin","middleName":"","lastName":"Yang","suffix":""},{"id":484416405,"identity":"99c88001-5f44-4ad6-94ab-1eb19fa87644","order_by":1,"name":"Li Cheng","email":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAA10lEQVRIiWNgGAWjYDACCRBRICHHD+EyE6vFwMJYsoFELRWJBgeI1cI/u/nYwy8GEgnGxw9vk2CosE5sYD97AL8ld46lG8sYSOSZnUkrk2A4k57YwJOXgFeLgUSOmbSEgUSx2Q0eMwnGtsOJDRI8BgS05H8DaUncPAOk5R9RWnLYJD8AtWyQAGlpIEKLxI00M2mgRmOJM2nFFglAj7Xx5ODXwj8j+Znkj4o6Of72wxtvfKixlu1nP4NfCwgw80AdyZAAJNkIqgcCxh8wLaNgFIyCUTAKsAEA3sE8bBLaCmoAAAAASUVORK5CYII=","orcid":"","institution":"Chongqing University","correspondingAuthor":true,"prefix":"","firstName":"Li","middleName":"","lastName":"Cheng","suffix":""},{"id":484416406,"identity":"eab618a7-55b1-463e-9642-3067b2492506","order_by":2,"name":"Bo Tao","email":"","orcid":"","institution":"Chongqing University","correspondingAuthor":false,"prefix":"","firstName":"Bo","middleName":"","lastName":"Tao","suffix":""}],"badges":[],"createdAt":"2025-06-20 09:08:24","currentVersionCode":1,"declarations":"","doi":"10.21203/rs.3.rs-6937277/v1","doiUrl":"https://doi.org/10.21203/rs.3.rs-6937277/v1","draftVersion":[],"editorialEvents":[],"editorialNote":"","failedWorkflow":false,"files":[{"id":86754680,"identity":"4f306d62-f7b7-430d-9ed5-315e693e8adb","added_by":"auto","created_at":"2025-07-15 09:09:39","extension":"pdf","order_by":1,"title":"","display":"","copyAsset":false,"role":"manuscript-pdf","size":25332801,"visible":true,"origin":"","legend":"","description":"","filename":"submission.pdf","url":"https://assets-eu.researchsquare.com/files/rs-6937277/v1_covered_f96f131e-cf93-43a2-bff3-9241510281a0.pdf"}],"financialInterests":"No competing interests reported.","formattedTitle":"AC Creeping Flashover Characteristics of Oil-Paper Interface Caused by Floating Discharge Under Parallel Component","fulltext":[],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":false,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":false,"hideJournal":false,"highlight":"","institution":"","isAcceptedByJournal":false,"isAuthorSuppliedPdf":true,"isDeskRejected":"","isHiddenFromSearch":false,"isInQc":false,"isInWorkflow":false,"isPdf":true,"isPdfUpToDate":true,"isWithdrawnOrRetracted":false,"journal":{"display":true,"email":"[email protected]","identity":"electrical-engineering","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":false,"externalIdentity":"elen","sideBox":"Learn more about [Electrical Engineering](http://link.springer.com/journal/202)","snPcode":"202","submissionUrl":"https://submission.nature.com/new-submission/202/3","title":"Electrical Engineering","twitterHandle":"","acdcEnabled":true,"dfaEnabled":true,"editorialSystem":"em","reportingPortfolio":"Springer Hybrid","inReviewEnabled":true,"inReviewRevisionsEnabled":false},"keywords":"Floating discharge, Creeping flashover, Streamer discharge, Oil-paper insulation","lastPublishedDoi":"10.21203/rs.3.rs-6937277/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-6937277/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"\u003cp\u003eFloating discharge was a typical fault in oil-immersed power transformers. Test models used in previous research were primarily simple vertical components, mainly simulating the barrier area. However, in the actual operation of transformers, areas with parallel components (such as the angle ring region) were equally critical. While the creeping flash-over characteristics of parallel components had been relatively well understood, studies on creeping flashover of the oil-paper interface caused by floating discharge under parallel components were limited. To investigate the flashover characteristics and processes, this study designed a test model featuring multi-ring electrodes and copper sheet floating electrodes. AC flashover tests were conducted on insulating pressboard subjected to floating discharge. The results showed that, for creepage distances of 60- 80 mm, the flashover voltage increased linearly with the creepage distance, while the average failure field strength fluctuated slightly around 3.54 kV/mm. Using a combination of macroscopic and microscopic analysis, the distinct asymmetry of damage on both sides of the suspended electrode was characterized. Additionally, high-speed imaging recorded the flashover process, including streamer discharge, from both perpendicular and parallel perspectives of the pressboard. This study clarified the entire flashover process, which included the stream-er discharge stage, the through discharge stage, and the complete flashover stage. Through finite element modeling of the corresponding stages and analysis of the carrier generation mechanism during streamer discharge, the intrinsic relationship between pressboard trace characteristics and the flashover process was elucidated. 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