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Bestämning av bruttotemperaturexpansionskoefficient för Faradol 810
Örebro University, School of Science and Technology, Örebro University, Sweden.
2013 (Swedish)Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesisAlternative title
Determination of gross thermal expansion coefficient for Farodol 810 (English)
Abstract [sv]

Detta examensarbete har genomförts på ABB Power Products/Instrument Transformers i Ludvika. Syftet med arbetet har varit att undersöka temperaturexpansionen för en isolerande olja som använd i produkten Capacitor Voltage Transformer (CVT). Oljans egen temperatur­expansionskoefficient                          var redan känd, men arbetets syfte var att bestämma en Brutto­temperaturexpansionskoefficient, med andra ord undersöka hur mycket de ingående komponenterna i en CVT påverkar den totala volymexpansionen inuti enheten.

För att bestämma bruttotemperaturexpansionskoefficienten har ett prov i klimatkammare utförts. Provet bestod av två aluminiumkärl vardera med ett monterat mätrör. Det ena kärlet fylldes med olja och det andra kärlet med olja och kondensatorinnehåll motsvarande inne­hållet i en CVT. Provobjekten utsattes sedan för en bestämd tid i temperaturer från -60°C till 65°C med intervall om 10°C. Under denna tid utfördes ett antal mätningar av oljevolymen i de båda provobjekten. Dessa mätningar användes sedan tillsammans med ett några korrektions­faktorer för att beräkna temperaturexpansionskoefficienten för både oljan (enbart för kontroll­erande syfte) och kondensatorinnehållet. Tillsammans ger dessa bruttotemperaturexpansions­koefficienten för alla möjliga volymkombinationer.

Resultatet från provet har sedan analyserats och visualiserats i form av tabeller och diagram. Efter det beräknades temperaturexpansionskoefficient för oljan samt  för kondensator­innehållet vid olika temperaturer. Utifrån dessa värden beräknades de genomsnittliga temperatur­­expansionskoefficienterna för temperaturintervallet och slutligen angavs en formel för att bestämma bruttotemperaturexpansionskoefficienten för olika procentuella fördelningar mellan olja och kondensatorinnehåll. Till sist drogs slutsatser utifrånfrån resultatet.

Abstract [en]

This bachelor thesis was carried out at ABB Power Products/Instrument Transformers in Ludvika. The purpose of the work has been to examine the thermal expansion for an isolating oil that is used in the product Capacitor Voltage Transformer (CVT). The oil’s own expansion coefficient                          was already known, but the purpose of the work was to determine a gross thermal expansion coefficient, with other words to examine the amount of influense the other componets had on the volume expansion inside the unit.

To decide the gross thermal expansion coefficient a test has been carried out in a climat chamer. To performe the test two aluminum tanks, each with a measurement tube mounted on the top were used. One of the tanks was filled with oil and the other one was filled with oil and capacitor contents corresponding tio the contents in a CVT. The two test objects were then exposed to temperatures reaching from -60°C to 65°C in steps of 10°C. During this time a number of volume measurements were performed on the two test objects. These measure­ments together with a few correction parameters were used to decide the thermal expansion coefficient for both the oil (only for control purpose) and the capacitor contents. Together these two gives the gross thermal expansion coefficient for all posible volume combinations.

The results from the tests has been analised and visualised in the form of tables an diagrams. After that the thermal expansion coefficient for the oil and the capacitorcontents, for different temperatures was calculated. Bult on those calculations the avarege thermal expansion coeff­icient for the temperatureintervals was calculated, and finaly an modle for calculating the gross thermal expansion coefficient was created. At the end conclusions were drawn from the results. 

Place, publisher, year, edition, pages
2013. , 37 p.
Keyword [en]
expansion coefficient faradol
Keyword [sv]
expansionkoefficient faradol
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:oru:diva-30760OAI: oai:DiVA.org:oru-30760DiVA: diva2:646911
Subject / course
Mechanical Engineering
Presentation
, Örebro (Swedish)
Supervisors
Examiners
Available from: 2013-09-27 Created: 2013-09-10 Last updated: 2013-09-27Bibliographically approved

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