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Kabeldiagnostik i mellanspänningsnät
Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design.
2018 (Swedish)Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
Abstract [sv]

Sundsvall elnät har länge jobbat med att vädersäkra sitt elnät genom att gräva ner sitt mellanspänningsnät och det finns i dagsläget inga riktlinjer för hur mellanspänningskablar skall inspekteras. Målet med denna rapport var att utveckla en metod för hur Sundsvall elnät skulle kunna bedöma skicket på sina mellanspänningskablar, utreda vilka referensvärden borde användas, samt utforma rekommendationer för hur mätningarna borde tolkas i förhållande till möjligheten att fortsätta att ha kablarna i drift. För att möta målen genomfördes en litteraturstudie där olika diagnostikmetoder undersöks, referensvärden togs fram. Kablarnas åldringsmekanismer undersöktes samt konsekvenser av dåliga kablar förklaras. Utöver detta så utfördes ett antal mätningar i fält med tillgängliga mätmetoder. Rapporten visar på att det finns många tillgängliga mätmetoder för kabeldiagnostik men att få metoder har erkända referensvärden för bedömning. Rapporten påvisar att en kombination av mätningar med tangens med VLF, mätning av partiella urladdningar samt resistansmätning av kabelskärm/följeledare kan vara en bra metod bedöma skicket på mellanspänningskablar.

 

Abstract [en]

Sundsvall elnät has been working to weatherproof their grid by placing their medium voltage grid underground and to this date there are no regulations with regards to how to inspect underground cables. The aim of this survey was to develop a method for Sundsvall elnät on how to assess the condition of their medium voltage cables, investigate which reference values should be used, and to formulate recommendations on how measurements should be interpreted with regards to how long the cable can remain in service. To meet the aim of the survey a literature study was conducted where different methods for cable diagnostics, reference values, ageing mechanisms for medium voltage cables and consequences of bad cables was investigated. Furthermore some measurements are performed in field environment with available equipment. The report shows that there are many available methods for diagnostics of medium voltage cables but few methods that have recognized reference values. The report also shows that a combination of measurements containing tangens  with VLF, measurement of partial discharges and a resistance measurement of the cable screen and ground line could be a useful method for assessing the condition of medium voltage cables.

 

Place, publisher, year, edition, pages
2018. , p. 51
Keywords [en]
Cable diagnostics, Medium voltage grid, Medium voltage cables
Keywords [sv]
Kabeldiagnostik, Mellanspänningsnät, Mellanspänningskablar
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:miun:diva-34116Local ID: ET-V18-G3-020OAI: oai:DiVA.org:miun-34116DiVA, id: diva2:1230943
Subject / course
Electrical Engineering ET2
Educational program
Electric Power Engineering TEKRG 180 higher education credits
Supervisors
Examiners
Available from: 2018-07-05 Created: 2018-07-05 Last updated: 2018-07-05Bibliographically approved

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CiteExportLink to record
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